LAN WeatherStation with Web Interface and PHP/MySQL Backend

A weather station with web Interface displaying results and trends over the previous three hours.

Nov 24, 2018

•

11804 views

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16 respects

weather

environmental sensing

monitoring

Components and supplies

DSD Tech DHT22 AM2302 Temperature and Humidity Sensor

Arduino Mega 2560

Robojax BMP280

Kuman K15 Ethernet Shield W5100

SainSmart LCD Module For Arduino 20 X 4

3.3V-5V 4 Channel Logic Level Converter

Project description

Code

weather.php

php

This is the page which displays the information. Bring it up by typing IP_ADDRESS\weather.php in your browser.

1<?php
2
3$link = mysqli_connect("127.0.0.1", "username", "password",   "weatherdata");
4
5//in the query I want to split the contents of the timestamp   field and just take the time portion
6//$query = "SELECT CONCAT(HOUR(timestamp),   ':', MINUTE(timestamp)) as dbTime, temperature, pressure, humidity FROM master ORDER   BY uid DESC LIMIT 24";
7$query = "SELECT uid, TIME(timestamp) as dbTime, temperature,   pressure, humidity FROM master ORDER BY uid DESC LIMIT 24";
8
9//query above   is executed
10//i'm not doing any error checking'
11$result = mysqli_query($link,   $query);
12
13//declare arrays
14//not really necessary
15$timestamps = array();
16$temperatures   = array();
17$pressure = array();
18$humidity = array();
19$pixelHeights = array();
20$pixelHeightsP   = array();
21
22//18 cols @ 10 min intervals = 3 hrs, indexed from 0
23$columnRange   = 17;
24
25//dump the db results into separate arrays so we can use them later   
26while ($db = mysqli_fetch_array($result))
27{
28	//chop off the seconds portion   of the time value
29  $pieces = explode(':', $db['dbTime']);
30	$formattedTime   = $pieces[0] . ':' . $pieces[1];
31	
32  $timestampsTime[] = $formattedTime;
33	$temperatures[]   = $db['temperature'];
34	$pressure[] = $db['pressure'];
35	$humidity[] = $db['humidity'];
36	$uid[]   = $db['uid'];
37}
38
39//find the min and max temps in the range and
40//define   the scale of the graph to display
41$mintemp = 50;
42$maxtemp = -50;
43for ($i   = 0; $i <= $columnRange; $i++)
44{
45	if ($mintemp > $temperatures[$i])
46	{
47		$mintemp   = $temperatures[$i];
48		$minTempTime = $timestampsTime[$i];
49	} 
50	
51	if   ($maxtemp < $temperatures[$i])
52	{
53		$maxtemp = $temperatures[$i];
54		$maxTempTime   = $timestampsTime[$i];
55	}
56}
57
58$rangeHigh = $maxtemp + 1;
59$rangeLow   = $mintemp - 1;
60
61//calculate the height for each data point
62//I add 50   to keep all values above zero, the difference between amounts remains the same
63//The   bars are then displayed as 10px wide and x% high using a single pixel as a base
64//I   got my pixel graphics from this site: 1x1px.me
65for ($i = 0; $i <= $columnRange;   $i++)
66{
67	$currentTemp = ($temperatures[$i] + 50) - ($rangeLow + 50);
68	$pixelHeights[$i]   = round($currentTemp / (($rangeHigh + 50) - ($rangeLow + 50)) * 100);
69}
70
71
72//pressure   calculations, same as temperature
73$minpress = 150;
74$maxpress = 50;
75for   ($i = 0; $i <= $columnRange; $i++)
76{
77	if ($minpress > $pressure[$i])
78	{
79		$minpress   = $pressure[$i];
80		$minPressTime = $timestampsTime[$i];
81	} 
82	
83	if   ($maxpress < $pressure[$i])
84	{
85		$maxpress = $pressure[$i];
86		$maxPressTime   = $timestampsTime[$i];
87	}
88}
89
90$rangeHighP = $maxpress + 1;
91$rangeLowP   = $minpress - 1;
92
93$pressureChange = $pressure[0] - $pressure[$columnRange];
94
95for   ($i = 0; $i <= $columnRange; $i++)
96{
97	$currentPressure = $pressure[$i] -   $rangeLowP;
98	$pixelHeightsP[$i] = round($currentPressure / ($rangeHighP - $rangeLowP)   * 100);
99}
100
101//calculate rates of change for temperature and pressure
102$rateOfChangePressure1   = ($pressure[0] - $pressure[5]); 
103$rateOfChangePressure3 = ($pressure[0] - $pressure[$columnRange])   / 3; 
104$rateOfChangeTemp1 = ($temperatures[0] - $temperatures[5]);
105
106//determines   the rising/falling/equality graphic
107//graphics came from flaticon.com/authors/elegant-themes
108function   showArrowGraphic($val) {
109  
110  if ($val > 0)
111  {
112    $arrowGraphic =   'up-sign.png';
113  }
114    elseif ($val < 0)
115  {
116    $arrowGraphic = 'down-arrow-outline.png';
117   }
118    else
119  {
120    $arrowGraphic = 'up-and-down-arrow.png';
121  }
122   return $arrowGraphic;
123
124}
125
126
127
128/*
129All calculations are done   above so HTML output starts after the closing PHP tag 
130From this point on, PHP   is interspersed as needed
131*/
132?>
133
134 <!DOCTYPE HTML PUBLIC "-//W3C//DTD   HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
135
136<html>
137<head>
138<title>LAN   WeatherStation v.1</title>
139</head>
140
141<body>
142<h1>LAN WeatherStation v.1</h1>
143<h2>Current   conditions:</h2>
144
145<!--       Summary table            -->
146
147<table>
148   <tr>
149    <td width='200'><b>Temperature:</b></td><td><?php echo round($temperatures[0],   1); ?> &deg;C</td>
150  </tr>
151  <tr>
152    <td><b>Barometric pressure:</b> </td><td><?php   echo round($pressure[0], 2); ?> kPa 
153      <img src='<?php echo $arrow = showArrowGraphic($pressureChange);   ?>' alt='arrow'></td>
154  </tr>
155  <tr>
156    <td><b>Relative humidity:</b></td><td><?php   echo round($humidity[0], 1); ?> %</td>
157  </tr>
158  <tr>
159    <td valign='bottom'   height='25'><b>&deg;C rate of change (1 hr)</b></td><td valign='bottom' height='25'><?php   echo round($rateOfChangeTemp1, 1); ?> &deg;C/hr 
160      <img src='<?php echo $arrow   = showArrowGraphic($rateOfChangeTemp1); ?>' alt='arrow'></td>
161  </tr>
162  <tr>
163     <td><b>kPa rate of change (1 hr)</b></td><td><?php echo round($rateOfChangePressure1,   2); ?> kPa/hr 
164      <img src='<?php echo $arrow = showArrowGraphic($rateOfChangePressure1);   ?>' alt='arrow'></td>
165  </tr>
166  <tr>
167    <td><b>kPa rate of change (3 hrs)</b></td><td><?php   echo round($rateOfChangePressure3, 2); ?> kPa/hr 
168      <img src='<?php echo   $arrow = showArrowGraphic($rateOfChangePressure3); ?>' alt='arrow'></td>
169  </tr>
170   <tr>
171    <td valign='bottom' height='25' colspan='2'>Last updated at <?php   echo $timestampsTime[0]; ?></td>
172  </tr>
173</table>
174
175
176<br>
177
178<!--        Temperature trend            -->
179
180<table style='border: 1px solid black;'>
181   <tr>
182    <td colspan='20'><b>Temperature trend (past 3 hours)</b></td>
183   </tr>
184  <tr>
185    <td colspan='20'>&nbsp;</td>
186  </tr>
187  <tr>
188	<td   width='150'>
189    <b>Current:</b> <?php echo round($temperatures[0], 1); ?> &deg;C   <br>
190	  <b style='color:red'>High:</b> <?php echo round($maxtemp, 1); ?> &deg;C   <br>
191	  <b style='color:blue'>Low:</b> <?php echo round($mintemp, 1); ?> &deg;C
192	</td>
193	<!--   add empty column for spacing -->
194	<td width='10'>
195	  &nbsp;
196	</td>
197	
198   <?php
199    
200    //Here we loop over the array of temperature values. 
201     //The corresponding values for pixelHeights is at the same index in its array   so we stretch our single pixel 
202    //graphic to be 10px wide and $pixelHeights[x]   high
203    //We also determine which column will be high and low for the range   and set the colours accordingly
204    for ($i = 0; $i <= $columnRange; $i++)
205     {
206      if ($temperatures[$i] == $maxtemp)
207      {
208        echo "<td   valign='bottom'><img src='red.png' height='" . $pixelHeights[$i] . "' width='10'   alt='pixel'></td> \
209";
210      }
211        elseif ($temperatures[$i] == $mintemp)
212       {
213        echo "<td valign='bottom'><img src='blue.png' height='" . $pixelHeights[$i]   . "' width='10' alt='pixel'></td> \
214";
215      }
216        else
217      {
218         echo "<td valign='bottom'><img src='black.png' height='" . $pixelHeights[$i]   . "' width='10' alt='pixel'></td> \
219";
220      }
221    }
222  ?>
223		
224	</tr>
225	<tr>
226	   <td colspan='2'>&nbsp;</td>
227	 <td colspan='9'><img src='up-sign.png' width='12'   alt='arrow'>&nbsp;<?php echo $timestampsTime[0]; ?></td>
228	 <td colspan='9' align='right'><?php   echo $timestampsTime[$columnRange]; ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
229	</tr>
230</table>   
231
232
233<br>
234
235<!--       Barometric trend            -->
236
237<table   style='border: 1px solid black;' >
238  <tr>
239    <td colspan='20'><b>Barometric   pressure trend (past 3 hours)</b></td>
240  </tr>
241  <tr>
242    <td colspan='20'>&nbsp;</td>
243   </tr>
244  <tr>
245  <td width='150'>
246	  <b>Current:</b> <?php echo round($pressure[0],   2); ?> kPa <br>
247	  <b style='color:red'>High:</b> <?php echo round($maxpress,   2); ?> kPa <br>
248	  <b style='color:blue'>Low:</b> <?php echo round($minpress,   2); ?> kPa
249	</td>
250	<!-- add empty column for spacing -->
251  <td width='10'>
252	   &nbsp;
253	</td>
254	
255  <?php
256    
257    //same as for temperature above
258     for ($i = 0; $i <= $columnRange; $i++)
259    {
260      if ($pressure[$i] ==   $maxpress)
261      {
262        echo "<td valign='bottom'><img src='red.png' height='"   . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td> \
263";
264      }
265        elseif   ($pressure[$i] == $minpress)
266      {
267        echo "<td valign='bottom'><img   src='blue.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>   \
268";
269      }
270        else
271      {
272        echo "<td valign='bottom'><img   src='black.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>   \
273";
274      }
275    }
276  ?>
277		
278	</tr>
279  <tr>
280    <td colspan='2'>&nbsp;</td>
281     <td colspan='9'><img src='up-sign.png' width='12' alt='arrow'>&nbsp;<?php echo   $timestampsTime[0]; ?></td>
282    <td colspan='9' align='right'><?php echo $timestampsTime[$columnRange];   ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
283	</tr>
284</table>
285
286</body>
287</html>

<?php

$link = mysqli_connect("127.0.0.1", "username", "password",   "weatherdata");

//in the query I want to split the contents of the timestamp   field and just take the time portion
//$query = "SELECT CONCAT(HOUR(timestamp),   ':', MINUTE(timestamp)) as dbTime, temperature, pressure, humidity FROM master ORDER   BY uid DESC LIMIT 24";
$query = "SELECT uid, TIME(timestamp) as dbTime, temperature,   pressure, humidity FROM master ORDER BY uid DESC LIMIT 24";

//query above   is executed
//i'm not doing any error checking'
$result = mysqli_query($link,   $query);

//declare arrays
//not really necessary
$timestamps = array();
$temperatures   = array();
$pressure = array();
$humidity = array();
$pixelHeights = array();
$pixelHeightsP   = array();

//18 cols @ 10 min intervals = 3 hrs, indexed from 0
$columnRange   = 17;

//dump the db results into separate arrays so we can use them later   
while ($db = mysqli_fetch_array($result))
{
	//chop off the seconds portion   of the time value
  $pieces = explode(':', $db['dbTime']);
	$formattedTime   = $pieces[0] . ':' . $pieces[1];
	
  $timestampsTime[] = $formattedTime;
	$temperatures[]   = $db['temperature'];
	$pressure[] = $db['pressure'];
	$humidity[] = $db['humidity'];
	$uid[]   = $db['uid'];
}

//find the min and max temps in the range and
//define   the scale of the graph to display
$mintemp = 50;
$maxtemp = -50;
for ($i   = 0; $i <= $columnRange; $i++)
{
	if ($mintemp > $temperatures[$i])
	{
		$mintemp   = $temperatures[$i];
		$minTempTime = $timestampsTime[$i];
	} 
	
	if   ($maxtemp < $temperatures[$i])
	{
		$maxtemp = $temperatures[$i];
		$maxTempTime   = $timestampsTime[$i];
	}
}

$rangeHigh = $maxtemp + 1;
$rangeLow   = $mintemp - 1;

//calculate the height for each data point
//I add 50   to keep all values above zero, the difference between amounts remains the same
//The   bars are then displayed as 10px wide and x% high using a single pixel as a base
//I   got my pixel graphics from this site: 1x1px.me
for ($i = 0; $i <= $columnRange;   $i++)
{
	$currentTemp = ($temperatures[$i] + 50) - ($rangeLow + 50);
	$pixelHeights[$i]   = round($currentTemp / (($rangeHigh + 50) - ($rangeLow + 50)) * 100);
}


//pressure   calculations, same as temperature
$minpress = 150;
$maxpress = 50;
for   ($i = 0; $i <= $columnRange; $i++)
{
	if ($minpress > $pressure[$i])
	{
		$minpress   = $pressure[$i];
		$minPressTime = $timestampsTime[$i];
	} 
	
	if   ($maxpress < $pressure[$i])
	{
		$maxpress = $pressure[$i];
		$maxPressTime   = $timestampsTime[$i];
	}
}

$rangeHighP = $maxpress + 1;
$rangeLowP   = $minpress - 1;

$pressureChange = $pressure[0] - $pressure[$columnRange];

for   ($i = 0; $i <= $columnRange; $i++)
{
	$currentPressure = $pressure[$i] -   $rangeLowP;
	$pixelHeightsP[$i] = round($currentPressure / ($rangeHighP - $rangeLowP)   * 100);
}

//calculate rates of change for temperature and pressure
$rateOfChangePressure1   = ($pressure[0] - $pressure[5]); 
$rateOfChangePressure3 = ($pressure[0] - $pressure[$columnRange])   / 3; 
$rateOfChangeTemp1 = ($temperatures[0] - $temperatures[5]);

//determines   the rising/falling/equality graphic
//graphics came from flaticon.com/authors/elegant-themes
function   showArrowGraphic($val) {
  
  if ($val > 0)
  {
    $arrowGraphic =   'up-sign.png';
  }
    elseif ($val < 0)
  {
    $arrowGraphic = 'down-arrow-outline.png';
   }
    else
  {
    $arrowGraphic = 'up-and-down-arrow.png';
  }
   return $arrowGraphic;

}



/*
All calculations are done   above so HTML output starts after the closing PHP tag 
From this point on, PHP   is interspersed as needed
*/
?>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD   HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<title>LAN   WeatherStation v.1</title>
</head>

<body>
<h1>LAN WeatherStation v.1</h1>
<h2>Current   conditions:</h2>

<!--       Summary table            -->

<table>
   <tr>
    <td width='200'><b>Temperature:</b></td><td><?php echo round($temperatures[0],   1); ?> &deg;C</td>
  </tr>
  <tr>
    <td><b>Barometric pressure:</b> </td><td><?php   echo round($pressure[0], 2); ?> kPa 
      <img src='<?php echo $arrow = showArrowGraphic($pressureChange);   ?>' alt='arrow'></td>
  </tr>
  <tr>
    <td><b>Relative humidity:</b></td><td><?php   echo round($humidity[0], 1); ?> %</td>
  </tr>
  <tr>
    <td valign='bottom'   height='25'><b>&deg;C rate of change (1 hr)</b></td><td valign='bottom' height='25'><?php   echo round($rateOfChangeTemp1, 1); ?> &deg;C/hr 
      <img src='<?php echo $arrow   = showArrowGraphic($rateOfChangeTemp1); ?>' alt='arrow'></td>
  </tr>
  <tr>
     <td><b>kPa rate of change (1 hr)</b></td><td><?php echo round($rateOfChangePressure1,   2); ?> kPa/hr 
      <img src='<?php echo $arrow = showArrowGraphic($rateOfChangePressure1);   ?>' alt='arrow'></td>
  </tr>
  <tr>
    <td><b>kPa rate of change (3 hrs)</b></td><td><?php   echo round($rateOfChangePressure3, 2); ?> kPa/hr 
      <img src='<?php echo   $arrow = showArrowGraphic($rateOfChangePressure3); ?>' alt='arrow'></td>
  </tr>
   <tr>
    <td valign='bottom' height='25' colspan='2'>Last updated at <?php   echo $timestampsTime[0]; ?></td>
  </tr>
</table>


<br>

<!--        Temperature trend            -->

<table style='border: 1px solid black;'>
   <tr>
    <td colspan='20'><b>Temperature trend (past 3 hours)</b></td>
   </tr>
  <tr>
    <td colspan='20'>&nbsp;</td>
  </tr>
  <tr>
	<td   width='150'>
    <b>Current:</b> <?php echo round($temperatures[0], 1); ?> &deg;C   <br>
	  <b style='color:red'>High:</b> <?php echo round($maxtemp, 1); ?> &deg;C   <br>
	  <b style='color:blue'>Low:</b> <?php echo round($mintemp, 1); ?> &deg;C
	</td>
	<!--   add empty column for spacing -->
	<td width='10'>
	  &nbsp;
	</td>
	
   <?php
    
    //Here we loop over the array of temperature values. 
     //The corresponding values for pixelHeights is at the same index in its array   so we stretch our single pixel 
    //graphic to be 10px wide and $pixelHeights[x]   high
    //We also determine which column will be high and low for the range   and set the colours accordingly
    for ($i = 0; $i <= $columnRange; $i++)
     {
      if ($temperatures[$i] == $maxtemp)
      {
        echo "<td   valign='bottom'><img src='red.png' height='" . $pixelHeights[$i] . "' width='10'   alt='pixel'></td> \
";
      }
        elseif ($temperatures[$i] == $mintemp)
       {
        echo "<td valign='bottom'><img src='blue.png' height='" . $pixelHeights[$i]   . "' width='10' alt='pixel'></td> \
";
      }
        else
      {
         echo "<td valign='bottom'><img src='black.png' height='" . $pixelHeights[$i]   . "' width='10' alt='pixel'></td> \
";
      }
    }
  ?>
		
	</tr>
	<tr>
	   <td colspan='2'>&nbsp;</td>
	 <td colspan='9'><img src='up-sign.png' width='12'   alt='arrow'>&nbsp;<?php echo $timestampsTime[0]; ?></td>
	 <td colspan='9' align='right'><?php   echo $timestampsTime[$columnRange]; ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
	</tr>
</table>   


<br>

<!--       Barometric trend            -->

<table   style='border: 1px solid black;' >
  <tr>
    <td colspan='20'><b>Barometric   pressure trend (past 3 hours)</b></td>
  </tr>
  <tr>
    <td colspan='20'>&nbsp;</td>
   </tr>
  <tr>
  <td width='150'>
	  <b>Current:</b> <?php echo round($pressure[0],   2); ?> kPa <br>
	  <b style='color:red'>High:</b> <?php echo round($maxpress,   2); ?> kPa <br>
	  <b style='color:blue'>Low:</b> <?php echo round($minpress,   2); ?> kPa
	</td>
	<!-- add empty column for spacing -->
  <td width='10'>
	   &nbsp;
	</td>
	
  <?php
    
    //same as for temperature above
     for ($i = 0; $i <= $columnRange; $i++)
    {
      if ($pressure[$i] ==   $maxpress)
      {
        echo "<td valign='bottom'><img src='red.png' height='"   . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td> \
";
      }
        elseif   ($pressure[$i] == $minpress)
      {
        echo "<td valign='bottom'><img   src='blue.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>   \
";
      }
        else
      {
        echo "<td valign='bottom'><img   src='black.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>   \
";
      }
    }
  ?>
		
	</tr>
  <tr>
    <td colspan='2'>&nbsp;</td>
     <td colspan='9'><img src='up-sign.png' width='12' alt='arrow'>&nbsp;<?php echo   $timestampsTime[0]; ?></td>
    <td colspan='9' align='right'><?php echo $timestampsTime[$columnRange];   ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
	</tr>
</table>

</body>
</html>

processincoming.php

php

This is the script that processes incoming data.

1<?php
2
3//establish a link to the database
4$link = mysqli_connect("127.0.0.1",  "username", "password", "weatherdata");
5
6//grab the values sent in the  GET request
7$temp = round($_GET['t'], 1);
8$press = round($_GET['p'], 2);
9$hum  =  round($_GET['h'], 1);
10
11
12//this is the query string to send to mysql.  the now() function will record the system datetime in the timestamp field
13//a  sensible person would be sanitizing his or her inputs before doing this
14$query  = "INSERT INTO master (timestamp, temperature, pressure, humidity) VALUES (NOW(),  '$temp', '$press', '$hum')";
15
16//execute the query/commit to the db
17$result  = mysqli_query($link, $query);
18
19//close the connection
20mysqli_close($link);
21
22?>

<?php

//establish a link to the database
$link = mysqli_connect("127.0.0.1",  "username", "password", "weatherdata");

//grab the values sent in the  GET request
$temp = round($_GET['t'], 1);
$press = round($_GET['p'], 2);
$hum  =  round($_GET['h'], 1);


//this is the query string to send to mysql.  the now() function will record the system datetime in the timestamp field
//a  sensible person would be sanitizing his or her inputs before doing this
$query  = "INSERT INTO master (timestamp, temperature, pressure, humidity) VALUES (NOW(),  '$temp', '$press', '$hum')";

//execute the query/commit to the db
$result  = mysqli_query($link, $query);

//close the connection
mysqli_close($link);

?>

WeatherStation_v1_webclient_no_lcd.ino

arduino

Slimmed down version with no LCD output. For smaller memory boards.

1#include <Wire.h>
2#include <dht.h>
3#include "i2c.h"
4#include   "i2c_BMP280.h"
5#include <SPI.h>
6#include <Ethernet.h>
7
8dht DHT;
9BMP280   bmp280;
10
11//specify the temp sensor
12#define DHTTYPE DHT22;
13#define DHT22_PIN   6
14
15float currentTemp;
16float currentHumid;
17
18float baroPressure;
19float   currentPressure;
20
21//engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
22float   altitudeAdjustment = 1;
23
24//ethernet client vars
25IPAddress server(192,168,1,35);   
26IPAddress ip(192, 168, 1, 36); //in case of DHCP failure
27IPAddress myDns(192,   168, 1, 1);
28EthernetClient client;
29
30byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF,   0xFE, 0xED };
31String urlString;
32String temperatureToDB;
33String pressureToDB;
34String   humidityToDB;
35
36
37
38void setup() {
39
40  Serial.begin(9600); 
41
42   //wait for sensors to be ready
43  delay(3000);
44  
45  //Check if BMP 280   is ready
46  if (bmp280.initialize()) 
47  {
48    Serial.println("Barometer   ready");
49  }
50    else
51  {
52    Serial.println("Barometer error");
53   }
54
55  //check if DHT22 is ready
56  int chk = DHT.read22(DHT22_PIN);
57   switch (chk)
58  {
59    case DHTLIB_OK:  
60    Serial.println("Temp sensor   ready"); 
61    break;
62    
63    case DHTLIB_ERROR_CHECKSUM: 
64    Serial.println("Temp   checksum error"); 
65    break;
66    
67    case DHTLIB_ERROR_TIMEOUT: 
68     Serial.println("Temp timeout"); 
69    break;
70    
71    default: 
72     Serial.println("Temp sensor error"); 
73    break;
74  }
75
76  bmp280.setEnabled(0);
77   bmp280.triggerMeasurement();
78
79  DHT.read22(DHT22_PIN);
80
81  if (Ethernet.begin(mac)   == 0) 
82  {
83    Serial.print("Failed to configure Ethernet using DHCP");
84     // Check for Ethernet hardware present
85    if (Ethernet.hardwareStatus()   == EthernetNoHardware) 
86    {
87      Serial.println("Ethernet shield not found");
88       //show failure flag
89    }
90    
91    if (Ethernet.linkStatus() == LinkOFF)   
92    {
93      Serial.println("Ethernet cable not connected.");
94    }
95     
96    // try to congifure using IP address instead of DHCP:
97    Ethernet.begin(mac,   ip, myDns);
98  } 
99    else 
100  {
101      Serial.print("Got IP via DHCP:   ");
102      Serial.println(Ethernet.localIP());
103  }
104
105  //wait for sensors   again
106  delay(3000);
107}
108
109void loop() {
110  
111  bmp280.triggerMeasurement();
112   bmp280.getPressure(baroPressure);
113  
114  DHT.read22(DHT22_PIN);
115  currentTemp   = DHT.temperature;
116  currentHumid = DHT.humidity;
117
118  currentPressure =   (baroPressure / 1000) + altitudeAdjustment;  //output kPa
119
120  //build the string   to send to the server
121  temperatureToDB = currentTemp;
122  pressureToDB = currentPressure;
123   humidityToDB = currentHumid;
124
125  //send the data
126  urlString = "GET /processincoming.php?t="   + temperatureToDB + "&p=" + pressureToDB + "&h=" +  humidityToDB + " HTTP/1.1";
127   sendDataToServer(urlString);
128
129  //wait 10 minutes
130  for (int i = 0; i   < 599; i++)
131  {
132    delay (1000);
133  }
134}
135
136void sendDataToServer(String   stringToSend)
137{
138  Serial.println(stringToSend);
139  if (client.connect(server,   80)) 
140  {
141    client.println(stringToSend);
142    client.println("Host:   192.168.1.35");
143    client.println("Connection: close");
144    client.println();
145   }
146    else
147  {
148    Serial.println("connection failed");
149  }
150}
151

#include <Wire.h>
#include <dht.h>
#include "i2c.h"
#include   "i2c_BMP280.h"
#include <SPI.h>
#include <Ethernet.h>

dht DHT;
BMP280   bmp280;

//specify the temp sensor
#define DHTTYPE DHT22;
#define DHT22_PIN   6

float currentTemp;
float currentHumid;

float baroPressure;
float   currentPressure;

//engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
float   altitudeAdjustment = 1;

//ethernet client vars
IPAddress server(192,168,1,35);   
IPAddress ip(192, 168, 1, 36); //in case of DHCP failure
IPAddress myDns(192,   168, 1, 1);
EthernetClient client;

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF,   0xFE, 0xED };
String urlString;
String temperatureToDB;
String pressureToDB;
String   humidityToDB;



void setup() {

  Serial.begin(9600); 

   //wait for sensors to be ready
  delay(3000);
  
  //Check if BMP 280   is ready
  if (bmp280.initialize()) 
  {
    Serial.println("Barometer   ready");
  }
    else
  {
    Serial.println("Barometer error");
   }

  //check if DHT22 is ready
  int chk = DHT.read22(DHT22_PIN);
   switch (chk)
  {
    case DHTLIB_OK:  
    Serial.println("Temp sensor   ready"); 
    break;
    
    case DHTLIB_ERROR_CHECKSUM: 
    Serial.println("Temp   checksum error"); 
    break;
    
    case DHTLIB_ERROR_TIMEOUT: 
     Serial.println("Temp timeout"); 
    break;
    
    default: 
     Serial.println("Temp sensor error"); 
    break;
  }

  bmp280.setEnabled(0);
   bmp280.triggerMeasurement();

  DHT.read22(DHT22_PIN);

  if (Ethernet.begin(mac)   == 0) 
  {
    Serial.print("Failed to configure Ethernet using DHCP");
     // Check for Ethernet hardware present
    if (Ethernet.hardwareStatus()   == EthernetNoHardware) 
    {
      Serial.println("Ethernet shield not found");
       //show failure flag
    }
    
    if (Ethernet.linkStatus() == LinkOFF)   
    {
      Serial.println("Ethernet cable not connected.");
    }
     
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac,   ip, myDns);
  } 
    else 
  {
      Serial.print("Got IP via DHCP:   ");
      Serial.println(Ethernet.localIP());
  }

  //wait for sensors   again
  delay(3000);
}

void loop() {
  
  bmp280.triggerMeasurement();
   bmp280.getPressure(baroPressure);
  
  DHT.read22(DHT22_PIN);
  currentTemp   = DHT.temperature;
  currentHumid = DHT.humidity;

  currentPressure =   (baroPressure / 1000) + altitudeAdjustment;  //output kPa

  //build the string   to send to the server
  temperatureToDB = currentTemp;
  pressureToDB = currentPressure;
   humidityToDB = currentHumid;

  //send the data
  urlString = "GET /processincoming.php?t="   + temperatureToDB + "&p=" + pressureToDB + "&h=" +  humidityToDB + " HTTP/1.1";
   sendDataToServer(urlString);

  //wait 10 minutes
  for (int i = 0; i   < 599; i++)
  {
    delay (1000);
  }
}

void sendDataToServer(String   stringToSend)
{
  Serial.println(stringToSend);
  if (client.connect(server,   80)) 
  {
    client.println(stringToSend);
    client.println("Host:   192.168.1.35");
    client.println("Connection: close");
    client.println();
   }
    else
  {
    Serial.println("connection failed");
  }
}

processincoming.php

php

This is the script that processes incoming data.

1<?php
2
3//establish a link to the database
4$link = mysqli_connect("127.0.0.1",
5  "username", "password", "weatherdata");
6
7//grab the values sent in the
8  GET request
9$temp = round($_GET['t'], 1);
10$press = round($_GET['p'], 2);
11$hum
12  =  round($_GET['h'], 1);
13
14
15//this is the query string to send to mysql.
16  the now() function will record the system datetime in the timestamp field
17//a
18  sensible person would be sanitizing his or her inputs before doing this
19$query
20  = "INSERT INTO master (timestamp, temperature, pressure, humidity) VALUES (NOW(),
21  '$temp', '$press', '$hum')";
22
23//execute the query/commit to the db
24$result
25  = mysqli_query($link, $query);
26
27//close the connection
28mysqli_close($link);
29
30?>

<?php

//establish a link to the database
$link = mysqli_connect("127.0.0.1",
  "username", "password", "weatherdata");

//grab the values sent in the
  GET request
$temp = round($_GET['t'], 1);
$press = round($_GET['p'], 2);
$hum
  =  round($_GET['h'], 1);


//this is the query string to send to mysql.
  the now() function will record the system datetime in the timestamp field
//a
  sensible person would be sanitizing his or her inputs before doing this
$query
  = "INSERT INTO master (timestamp, temperature, pressure, humidity) VALUES (NOW(),
  '$temp', '$press', '$hum')";

//execute the query/commit to the db
$result
  = mysqli_query($link, $query);

//close the connection
mysqli_close($link);

?>

WeatherStation_v1_webclient_no_lcd.ino

arduino

Slimmed down version with no LCD output. For smaller memory boards.

1#include <Wire.h>
2#include <dht.h>
3#include "i2c.h"
4#include  "i2c_BMP280.h"
5#include <SPI.h>
6#include <Ethernet.h>
7
8dht DHT;
9BMP280  bmp280;
10
11//specify the temp sensor
12#define DHTTYPE DHT22;
13#define DHT22_PIN  6
14
15float currentTemp;
16float currentHumid;
17
18float baroPressure;
19float  currentPressure;
20
21//engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
22float  altitudeAdjustment = 1;
23
24//ethernet client vars
25IPAddress server(192,168,1,35);  
26IPAddress ip(192, 168, 1, 36); //in case of DHCP failure
27IPAddress myDns(192,  168, 1, 1);
28EthernetClient client;
29
30byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF,  0xFE, 0xED };
31String urlString;
32String temperatureToDB;
33String pressureToDB;
34String  humidityToDB;
35
36
37
38void setup() {
39
40  Serial.begin(9600); 
41
42  //wait for sensors to be ready
43  delay(3000);
44  
45  //Check if BMP 280  is ready
46  if (bmp280.initialize()) 
47  {
48    Serial.println("Barometer  ready");
49  }
50    else
51  {
52    Serial.println("Barometer error");
53  }
54
55  //check if DHT22 is ready
56  int chk = DHT.read22(DHT22_PIN);
57  switch (chk)
58  {
59    case DHTLIB_OK:  
60    Serial.println("Temp sensor  ready"); 
61    break;
62    
63    case DHTLIB_ERROR_CHECKSUM: 
64    Serial.println("Temp  checksum error"); 
65    break;
66    
67    case DHTLIB_ERROR_TIMEOUT: 
68    Serial.println("Temp timeout"); 
69    break;
70    
71    default: 
72    Serial.println("Temp sensor error"); 
73    break;
74  }
75
76  bmp280.setEnabled(0);
77  bmp280.triggerMeasurement();
78
79  DHT.read22(DHT22_PIN);
80
81  if (Ethernet.begin(mac)  == 0) 
82  {
83    Serial.print("Failed to configure Ethernet using DHCP");
84    // Check for Ethernet hardware present
85    if (Ethernet.hardwareStatus()  == EthernetNoHardware) 
86    {
87      Serial.println("Ethernet shield not found");
88      //show failure flag
89    }
90    
91    if (Ethernet.linkStatus() == LinkOFF)  
92    {
93      Serial.println("Ethernet cable not connected.");
94    }
95    
96    // try to congifure using IP address instead of DHCP:
97    Ethernet.begin(mac,  ip, myDns);
98  } 
99    else 
100  {
101      Serial.print("Got IP via DHCP:  ");
102      Serial.println(Ethernet.localIP());
103  }
104
105  //wait for sensors  again
106  delay(3000);
107}
108
109void loop() {
110  
111  bmp280.triggerMeasurement();
112  bmp280.getPressure(baroPressure);
113  
114  DHT.read22(DHT22_PIN);
115  currentTemp  = DHT.temperature;
116  currentHumid = DHT.humidity;
117
118  currentPressure =  (baroPressure / 1000) + altitudeAdjustment;  //output kPa
119
120  //build the string  to send to the server
121  temperatureToDB = currentTemp;
122  pressureToDB = currentPressure;
123  humidityToDB = currentHumid;
124
125  //send the data
126  urlString = "GET /processincoming.php?t="  + temperatureToDB + "&p=" + pressureToDB + "&h=" +  humidityToDB + " HTTP/1.1";
127  sendDataToServer(urlString);
128
129  //wait 10 minutes
130  for (int i = 0; i  < 599; i++)
131  {
132    delay (1000);
133  }
134}
135
136void sendDataToServer(String  stringToSend)
137{
138  Serial.println(stringToSend);
139  if (client.connect(server,  80)) 
140  {
141    client.println(stringToSend);
142    client.println("Host:  192.168.1.35");
143    client.println("Connection: close");
144    client.println();
145  }
146    else
147  {
148    Serial.println("connection failed");
149  }
150}
151

#include <Wire.h>
#include <dht.h>
#include "i2c.h"
#include  "i2c_BMP280.h"
#include <SPI.h>
#include <Ethernet.h>

dht DHT;
BMP280  bmp280;

//specify the temp sensor
#define DHTTYPE DHT22;
#define DHT22_PIN  6

float currentTemp;
float currentHumid;

float baroPressure;
float  currentPressure;

//engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
float  altitudeAdjustment = 1;

//ethernet client vars
IPAddress server(192,168,1,35);  
IPAddress ip(192, 168, 1, 36); //in case of DHCP failure
IPAddress myDns(192,  168, 1, 1);
EthernetClient client;

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF,  0xFE, 0xED };
String urlString;
String temperatureToDB;
String pressureToDB;
String  humidityToDB;



void setup() {

  Serial.begin(9600); 

  //wait for sensors to be ready
  delay(3000);
  
  //Check if BMP 280  is ready
  if (bmp280.initialize()) 
  {
    Serial.println("Barometer  ready");
  }
    else
  {
    Serial.println("Barometer error");
  }

  //check if DHT22 is ready
  int chk = DHT.read22(DHT22_PIN);
  switch (chk)
  {
    case DHTLIB_OK:  
    Serial.println("Temp sensor  ready"); 
    break;
    
    case DHTLIB_ERROR_CHECKSUM: 
    Serial.println("Temp  checksum error"); 
    break;
    
    case DHTLIB_ERROR_TIMEOUT: 
    Serial.println("Temp timeout"); 
    break;
    
    default: 
    Serial.println("Temp sensor error"); 
    break;
  }

  bmp280.setEnabled(0);
  bmp280.triggerMeasurement();

  DHT.read22(DHT22_PIN);

  if (Ethernet.begin(mac)  == 0) 
  {
    Serial.print("Failed to configure Ethernet using DHCP");
    // Check for Ethernet hardware present
    if (Ethernet.hardwareStatus()  == EthernetNoHardware) 
    {
      Serial.println("Ethernet shield not found");
      //show failure flag
    }
    
    if (Ethernet.linkStatus() == LinkOFF)  
    {
      Serial.println("Ethernet cable not connected.");
    }
    
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac,  ip, myDns);
  } 
    else 
  {
      Serial.print("Got IP via DHCP:  ");
      Serial.println(Ethernet.localIP());
  }

  //wait for sensors  again
  delay(3000);
}

void loop() {
  
  bmp280.triggerMeasurement();
  bmp280.getPressure(baroPressure);
  
  DHT.read22(DHT22_PIN);
  currentTemp  = DHT.temperature;
  currentHumid = DHT.humidity;

  currentPressure =  (baroPressure / 1000) + altitudeAdjustment;  //output kPa

  //build the string  to send to the server
  temperatureToDB = currentTemp;
  pressureToDB = currentPressure;
  humidityToDB = currentHumid;

  //send the data
  urlString = "GET /processincoming.php?t="  + temperatureToDB + "&p=" + pressureToDB + "&h=" +  humidityToDB + " HTTP/1.1";
  sendDataToServer(urlString);

  //wait 10 minutes
  for (int i = 0; i  < 599; i++)
  {
    delay (1000);
  }
}

void sendDataToServer(String  stringToSend)
{
  Serial.println(stringToSend);
  if (client.connect(server,  80)) 
  {
    client.println(stringToSend);
    client.println("Host:  192.168.1.35");
    client.println("Connection: close");
    client.println();
  }
    else
  {
    Serial.println("connection failed");
  }
}

weather.php

php

This is the page which displays the information. Bring it up by typing IP_ADDRESS\weather.php in your browser.

1<?php
2
3$link = mysqli_connect("127.0.0.1", "username", "password",  "weatherdata");
4
5//in the query I want to split the contents of the timestamp  field and just take the time portion
6//$query = "SELECT CONCAT(HOUR(timestamp),  ':', MINUTE(timestamp)) as dbTime, temperature, pressure, humidity FROM master ORDER  BY uid DESC LIMIT 24";
7$query = "SELECT uid, TIME(timestamp) as dbTime, temperature,  pressure, humidity FROM master ORDER BY uid DESC LIMIT 24";
8
9//query above  is executed
10//i'm not doing any error checking'
11$result = mysqli_query($link,  $query);
12
13//declare arrays
14//not really necessary
15$timestamps = array();
16$temperatures  = array();
17$pressure = array();
18$humidity = array();
19$pixelHeights = array();
20$pixelHeightsP  = array();
21
22//18 cols @ 10 min intervals = 3 hrs, indexed from 0
23$columnRange  = 17;
24
25//dump the db results into separate arrays so we can use them later  
26while ($db = mysqli_fetch_array($result))
27{
28	//chop off the seconds portion  of the time value
29  $pieces = explode(':', $db['dbTime']);
30	$formattedTime  = $pieces[0] . ':' . $pieces[1];
31	
32  $timestampsTime[] = $formattedTime;
33	$temperatures[]  = $db['temperature'];
34	$pressure[] = $db['pressure'];
35	$humidity[] = $db['humidity'];
36	$uid[]  = $db['uid'];
37}
38
39//find the min and max temps in the range and
40//define  the scale of the graph to display
41$mintemp = 50;
42$maxtemp = -50;
43for ($i  = 0; $i <= $columnRange; $i++)
44{
45	if ($mintemp > $temperatures[$i])
46	{
47		$mintemp  = $temperatures[$i];
48		$minTempTime = $timestampsTime[$i];
49	} 
50	
51	if  ($maxtemp < $temperatures[$i])
52	{
53		$maxtemp = $temperatures[$i];
54		$maxTempTime  = $timestampsTime[$i];
55	}
56}
57
58$rangeHigh = $maxtemp + 1;
59$rangeLow  = $mintemp - 1;
60
61//calculate the height for each data point
62//I add 50  to keep all values above zero, the difference between amounts remains the same
63//The  bars are then displayed as 10px wide and x% high using a single pixel as a base
64//I  got my pixel graphics from this site: 1x1px.me
65for ($i = 0; $i <= $columnRange;  $i++)
66{
67	$currentTemp = ($temperatures[$i] + 50) - ($rangeLow + 50);
68	$pixelHeights[$i]  = round($currentTemp / (($rangeHigh + 50) - ($rangeLow + 50)) * 100);
69}
70
71
72//pressure  calculations, same as temperature
73$minpress = 150;
74$maxpress = 50;
75for  ($i = 0; $i <= $columnRange; $i++)
76{
77	if ($minpress > $pressure[$i])
78	{
79		$minpress  = $pressure[$i];
80		$minPressTime = $timestampsTime[$i];
81	} 
82	
83	if  ($maxpress < $pressure[$i])
84	{
85		$maxpress = $pressure[$i];
86		$maxPressTime  = $timestampsTime[$i];
87	}
88}
89
90$rangeHighP = $maxpress + 1;
91$rangeLowP  = $minpress - 1;
92
93$pressureChange = $pressure[0] - $pressure[$columnRange];
94
95for  ($i = 0; $i <= $columnRange; $i++)
96{
97	$currentPressure = $pressure[$i] -  $rangeLowP;
98	$pixelHeightsP[$i] = round($currentPressure / ($rangeHighP - $rangeLowP)  * 100);
99}
100
101//calculate rates of change for temperature and pressure
102$rateOfChangePressure1  = ($pressure[0] - $pressure[5]); 
103$rateOfChangePressure3 = ($pressure[0] - $pressure[$columnRange])  / 3; 
104$rateOfChangeTemp1 = ($temperatures[0] - $temperatures[5]);
105
106//determines  the rising/falling/equality graphic
107//graphics came from flaticon.com/authors/elegant-themes
108function  showArrowGraphic($val) {
109  
110  if ($val > 0)
111  {
112    $arrowGraphic =  'up-sign.png';
113  }
114    elseif ($val < 0)
115  {
116    $arrowGraphic = 'down-arrow-outline.png';
117  }
118    else
119  {
120    $arrowGraphic = 'up-and-down-arrow.png';
121  }
122  return $arrowGraphic;
123
124}
125
126
127
128/*
129All calculations are done  above so HTML output starts after the closing PHP tag 
130From this point on, PHP  is interspersed as needed
131*/
132?>
133
134 <!DOCTYPE HTML PUBLIC "-//W3C//DTD  HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
135
136<html>
137<head>
138<title>LAN  WeatherStation v.1</title>
139</head>
140
141<body>
142<h1>LAN WeatherStation v.1</h1>
143<h2>Current  conditions:</h2>
144
145<!--       Summary table            -->
146
147<table>
148  <tr>
149    <td width='200'><b>Temperature:</b></td><td><?php echo round($temperatures[0],  1); ?> &deg;C</td>
150  </tr>
151  <tr>
152    <td><b>Barometric pressure:</b> </td><td><?php  echo round($pressure[0], 2); ?> kPa 
153      <img src='<?php echo $arrow = showArrowGraphic($pressureChange);  ?>' alt='arrow'></td>
154  </tr>
155  <tr>
156    <td><b>Relative humidity:</b></td><td><?php  echo round($humidity[0], 1); ?> %</td>
157  </tr>
158  <tr>
159    <td valign='bottom'  height='25'><b>&deg;C rate of change (1 hr)</b></td><td valign='bottom' height='25'><?php  echo round($rateOfChangeTemp1, 1); ?> &deg;C/hr 
160      <img src='<?php echo $arrow  = showArrowGraphic($rateOfChangeTemp1); ?>' alt='arrow'></td>
161  </tr>
162  <tr>
163    <td><b>kPa rate of change (1 hr)</b></td><td><?php echo round($rateOfChangePressure1,  2); ?> kPa/hr 
164      <img src='<?php echo $arrow = showArrowGraphic($rateOfChangePressure1);  ?>' alt='arrow'></td>
165  </tr>
166  <tr>
167    <td><b>kPa rate of change (3 hrs)</b></td><td><?php  echo round($rateOfChangePressure3, 2); ?> kPa/hr 
168      <img src='<?php echo  $arrow = showArrowGraphic($rateOfChangePressure3); ?>' alt='arrow'></td>
169  </tr>
170  <tr>
171    <td valign='bottom' height='25' colspan='2'>Last updated at <?php  echo $timestampsTime[0]; ?></td>
172  </tr>
173</table>
174
175
176<br>
177
178<!--       Temperature trend            -->
179
180<table style='border: 1px solid black;'>
181  <tr>
182    <td colspan='20'><b>Temperature trend (past 3 hours)</b></td>
183  </tr>
184  <tr>
185    <td colspan='20'>&nbsp;</td>
186  </tr>
187  <tr>
188	<td  width='150'>
189    <b>Current:</b> <?php echo round($temperatures[0], 1); ?> &deg;C  <br>
190	  <b style='color:red'>High:</b> <?php echo round($maxtemp, 1); ?> &deg;C  <br>
191	  <b style='color:blue'>Low:</b> <?php echo round($mintemp, 1); ?> &deg;C
192	</td>
193	<!--  add empty column for spacing -->
194	<td width='10'>
195	  &nbsp;
196	</td>
197	
198  <?php
199    
200    //Here we loop over the array of temperature values. 
201    //The corresponding values for pixelHeights is at the same index in its array  so we stretch our single pixel 
202    //graphic to be 10px wide and $pixelHeights[x]  high
203    //We also determine which column will be high and low for the range  and set the colours accordingly
204    for ($i = 0; $i <= $columnRange; $i++)
205    {
206      if ($temperatures[$i] == $maxtemp)
207      {
208        echo "<td  valign='bottom'><img src='red.png' height='" . $pixelHeights[$i] . "' width='10'  alt='pixel'></td> \
209";
210      }
211        elseif ($temperatures[$i] == $mintemp)
212      {
213        echo "<td valign='bottom'><img src='blue.png' height='" . $pixelHeights[$i]  . "' width='10' alt='pixel'></td> \
214";
215      }
216        else
217      {
218        echo "<td valign='bottom'><img src='black.png' height='" . $pixelHeights[$i]  . "' width='10' alt='pixel'></td> \
219";
220      }
221    }
222  ?>
223		
224	</tr>
225	<tr>
226	  <td colspan='2'>&nbsp;</td>
227	 <td colspan='9'><img src='up-sign.png' width='12'  alt='arrow'>&nbsp;<?php echo $timestampsTime[0]; ?></td>
228	 <td colspan='9' align='right'><?php  echo $timestampsTime[$columnRange]; ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
229	</tr>
230</table>  
231
232
233<br>
234
235<!--       Barometric trend            -->
236
237<table  style='border: 1px solid black;' >
238  <tr>
239    <td colspan='20'><b>Barometric  pressure trend (past 3 hours)</b></td>
240  </tr>
241  <tr>
242    <td colspan='20'>&nbsp;</td>
243  </tr>
244  <tr>
245  <td width='150'>
246	  <b>Current:</b> <?php echo round($pressure[0],  2); ?> kPa <br>
247	  <b style='color:red'>High:</b> <?php echo round($maxpress,  2); ?> kPa <br>
248	  <b style='color:blue'>Low:</b> <?php echo round($minpress,  2); ?> kPa
249	</td>
250	<!-- add empty column for spacing -->
251  <td width='10'>
252	  &nbsp;
253	</td>
254	
255  <?php
256    
257    //same as for temperature above
258    for ($i = 0; $i <= $columnRange; $i++)
259    {
260      if ($pressure[$i] ==  $maxpress)
261      {
262        echo "<td valign='bottom'><img src='red.png' height='"  . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td> \
263";
264      }
265        elseif  ($pressure[$i] == $minpress)
266      {
267        echo "<td valign='bottom'><img  src='blue.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>  \
268";
269      }
270        else
271      {
272        echo "<td valign='bottom'><img  src='black.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>  \
273";
274      }
275    }
276  ?>
277		
278	</tr>
279  <tr>
280    <td colspan='2'>&nbsp;</td>
281    <td colspan='9'><img src='up-sign.png' width='12' alt='arrow'>&nbsp;<?php echo  $timestampsTime[0]; ?></td>
282    <td colspan='9' align='right'><?php echo $timestampsTime[$columnRange];  ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
283	</tr>
284</table>
285
286</body>
287</html>

<?php

$link = mysqli_connect("127.0.0.1", "username", "password",  "weatherdata");

//in the query I want to split the contents of the timestamp  field and just take the time portion
//$query = "SELECT CONCAT(HOUR(timestamp),  ':', MINUTE(timestamp)) as dbTime, temperature, pressure, humidity FROM master ORDER  BY uid DESC LIMIT 24";
$query = "SELECT uid, TIME(timestamp) as dbTime, temperature,  pressure, humidity FROM master ORDER BY uid DESC LIMIT 24";

//query above  is executed
//i'm not doing any error checking'
$result = mysqli_query($link,  $query);

//declare arrays
//not really necessary
$timestamps = array();
$temperatures  = array();
$pressure = array();
$humidity = array();
$pixelHeights = array();
$pixelHeightsP  = array();

//18 cols @ 10 min intervals = 3 hrs, indexed from 0
$columnRange  = 17;

//dump the db results into separate arrays so we can use them later  
while ($db = mysqli_fetch_array($result))
{
	//chop off the seconds portion  of the time value
  $pieces = explode(':', $db['dbTime']);
	$formattedTime  = $pieces[0] . ':' . $pieces[1];
	
  $timestampsTime[] = $formattedTime;
	$temperatures[]  = $db['temperature'];
	$pressure[] = $db['pressure'];
	$humidity[] = $db['humidity'];
	$uid[]  = $db['uid'];
}

//find the min and max temps in the range and
//define  the scale of the graph to display
$mintemp = 50;
$maxtemp = -50;
for ($i  = 0; $i <= $columnRange; $i++)
{
	if ($mintemp > $temperatures[$i])
	{
		$mintemp  = $temperatures[$i];
		$minTempTime = $timestampsTime[$i];
	} 
	
	if  ($maxtemp < $temperatures[$i])
	{
		$maxtemp = $temperatures[$i];
		$maxTempTime  = $timestampsTime[$i];
	}
}

$rangeHigh = $maxtemp + 1;
$rangeLow  = $mintemp - 1;

//calculate the height for each data point
//I add 50  to keep all values above zero, the difference between amounts remains the same
//The  bars are then displayed as 10px wide and x% high using a single pixel as a base
//I  got my pixel graphics from this site: 1x1px.me
for ($i = 0; $i <= $columnRange;  $i++)
{
	$currentTemp = ($temperatures[$i] + 50) - ($rangeLow + 50);
	$pixelHeights[$i]  = round($currentTemp / (($rangeHigh + 50) - ($rangeLow + 50)) * 100);
}


//pressure  calculations, same as temperature
$minpress = 150;
$maxpress = 50;
for  ($i = 0; $i <= $columnRange; $i++)
{
	if ($minpress > $pressure[$i])
	{
		$minpress  = $pressure[$i];
		$minPressTime = $timestampsTime[$i];
	} 
	
	if  ($maxpress < $pressure[$i])
	{
		$maxpress = $pressure[$i];
		$maxPressTime  = $timestampsTime[$i];
	}
}

$rangeHighP = $maxpress + 1;
$rangeLowP  = $minpress - 1;

$pressureChange = $pressure[0] - $pressure[$columnRange];

for  ($i = 0; $i <= $columnRange; $i++)
{
	$currentPressure = $pressure[$i] -  $rangeLowP;
	$pixelHeightsP[$i] = round($currentPressure / ($rangeHighP - $rangeLowP)  * 100);
}

//calculate rates of change for temperature and pressure
$rateOfChangePressure1  = ($pressure[0] - $pressure[5]); 
$rateOfChangePressure3 = ($pressure[0] - $pressure[$columnRange])  / 3; 
$rateOfChangeTemp1 = ($temperatures[0] - $temperatures[5]);

//determines  the rising/falling/equality graphic
//graphics came from flaticon.com/authors/elegant-themes
function  showArrowGraphic($val) {
  
  if ($val > 0)
  {
    $arrowGraphic =  'up-sign.png';
  }
    elseif ($val < 0)
  {
    $arrowGraphic = 'down-arrow-outline.png';
  }
    else
  {
    $arrowGraphic = 'up-and-down-arrow.png';
  }
  return $arrowGraphic;

}



/*
All calculations are done  above so HTML output starts after the closing PHP tag 
From this point on, PHP  is interspersed as needed
*/
?>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD  HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<title>LAN  WeatherStation v.1</title>
</head>

<body>
<h1>LAN WeatherStation v.1</h1>
<h2>Current  conditions:</h2>

<!--       Summary table            -->

<table>
  <tr>
    <td width='200'><b>Temperature:</b></td><td><?php echo round($temperatures[0],  1); ?> &deg;C</td>
  </tr>
  <tr>
    <td><b>Barometric pressure:</b> </td><td><?php  echo round($pressure[0], 2); ?> kPa 
      <img src='<?php echo $arrow = showArrowGraphic($pressureChange);  ?>' alt='arrow'></td>
  </tr>
  <tr>
    <td><b>Relative humidity:</b></td><td><?php  echo round($humidity[0], 1); ?> %</td>
  </tr>
  <tr>
    <td valign='bottom'  height='25'><b>&deg;C rate of change (1 hr)</b></td><td valign='bottom' height='25'><?php  echo round($rateOfChangeTemp1, 1); ?> &deg;C/hr 
      <img src='<?php echo $arrow  = showArrowGraphic($rateOfChangeTemp1); ?>' alt='arrow'></td>
  </tr>
  <tr>
    <td><b>kPa rate of change (1 hr)</b></td><td><?php echo round($rateOfChangePressure1,  2); ?> kPa/hr 
      <img src='<?php echo $arrow = showArrowGraphic($rateOfChangePressure1);  ?>' alt='arrow'></td>
  </tr>
  <tr>
    <td><b>kPa rate of change (3 hrs)</b></td><td><?php  echo round($rateOfChangePressure3, 2); ?> kPa/hr 
      <img src='<?php echo  $arrow = showArrowGraphic($rateOfChangePressure3); ?>' alt='arrow'></td>
  </tr>
  <tr>
    <td valign='bottom' height='25' colspan='2'>Last updated at <?php  echo $timestampsTime[0]; ?></td>
  </tr>
</table>


<br>

<!--       Temperature trend            -->

<table style='border: 1px solid black;'>
  <tr>
    <td colspan='20'><b>Temperature trend (past 3 hours)</b></td>
  </tr>
  <tr>
    <td colspan='20'>&nbsp;</td>
  </tr>
  <tr>
	<td  width='150'>
    <b>Current:</b> <?php echo round($temperatures[0], 1); ?> &deg;C  <br>
	  <b style='color:red'>High:</b> <?php echo round($maxtemp, 1); ?> &deg;C  <br>
	  <b style='color:blue'>Low:</b> <?php echo round($mintemp, 1); ?> &deg;C
	</td>
	<!--  add empty column for spacing -->
	<td width='10'>
	  &nbsp;
	</td>
	
  <?php
    
    //Here we loop over the array of temperature values. 
    //The corresponding values for pixelHeights is at the same index in its array  so we stretch our single pixel 
    //graphic to be 10px wide and $pixelHeights[x]  high
    //We also determine which column will be high and low for the range  and set the colours accordingly
    for ($i = 0; $i <= $columnRange; $i++)
    {
      if ($temperatures[$i] == $maxtemp)
      {
        echo "<td  valign='bottom'><img src='red.png' height='" . $pixelHeights[$i] . "' width='10'  alt='pixel'></td> \
";
      }
        elseif ($temperatures[$i] == $mintemp)
      {
        echo "<td valign='bottom'><img src='blue.png' height='" . $pixelHeights[$i]  . "' width='10' alt='pixel'></td> \
";
      }
        else
      {
        echo "<td valign='bottom'><img src='black.png' height='" . $pixelHeights[$i]  . "' width='10' alt='pixel'></td> \
";
      }
    }
  ?>
		
	</tr>
	<tr>
	  <td colspan='2'>&nbsp;</td>
	 <td colspan='9'><img src='up-sign.png' width='12'  alt='arrow'>&nbsp;<?php echo $timestampsTime[0]; ?></td>
	 <td colspan='9' align='right'><?php  echo $timestampsTime[$columnRange]; ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
	</tr>
</table>  


<br>

<!--       Barometric trend            -->

<table  style='border: 1px solid black;' >
  <tr>
    <td colspan='20'><b>Barometric  pressure trend (past 3 hours)</b></td>
  </tr>
  <tr>
    <td colspan='20'>&nbsp;</td>
  </tr>
  <tr>
  <td width='150'>
	  <b>Current:</b> <?php echo round($pressure[0],  2); ?> kPa <br>
	  <b style='color:red'>High:</b> <?php echo round($maxpress,  2); ?> kPa <br>
	  <b style='color:blue'>Low:</b> <?php echo round($minpress,  2); ?> kPa
	</td>
	<!-- add empty column for spacing -->
  <td width='10'>
	  &nbsp;
	</td>
	
  <?php
    
    //same as for temperature above
    for ($i = 0; $i <= $columnRange; $i++)
    {
      if ($pressure[$i] ==  $maxpress)
      {
        echo "<td valign='bottom'><img src='red.png' height='"  . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td> \
";
      }
        elseif  ($pressure[$i] == $minpress)
      {
        echo "<td valign='bottom'><img  src='blue.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>  \
";
      }
        else
      {
        echo "<td valign='bottom'><img  src='black.png' height='" . $pixelHeightsP[$i] . "' width='10' alt='pixel'></td>  \
";
      }
    }
  ?>
		
	</tr>
  <tr>
    <td colspan='2'>&nbsp;</td>
    <td colspan='9'><img src='up-sign.png' width='12' alt='arrow'>&nbsp;<?php echo  $timestampsTime[0]; ?></td>
    <td colspan='9' align='right'><?php echo $timestampsTime[$columnRange];  ?>&nbsp;<img src='up-sign.png' width='12' alt='arrow'></td>
	</tr>
</table>

</body>
</html>

WeatherStation_20x4_v1_webclient.ino

arduino

Full version with LCD output

1#include <LCD.h>
2#include <LiquidCrystal_I2C.h>
3//#include <Wire.h>
4#include  <dht.h>
5#include "i2c.h"
6#include "i2c_BMP280.h"
7#include <SPI.h>
8#include  <Ethernet.h>
9
10dht DHT;
11BMP280 bmp280;
12
13//specify the temp sensor
14#define  DHTTYPE DHT22;
15#define DHT22_PIN 6
16
17#define I2C_ADDR    0x27  // Define  I2C Address where the PCF8574A is
18#define BACKLIGHT_PIN     3
19#define En_pin  2
20#define Rw_pin  1
21#define Rs_pin  0
22#define D4_pin  4
23#define D5_pin  5
24#define D6_pin  6
25#define D7_pin  7
26
27LiquidCrystal_I2C  lcd(I2C_ADDR,  En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin);
28
29//total delay =  (lcdDelayScreen1 + lcdDelayScreen2 + lcdDelayScreen3) * loopCount (in seconds)
30int  lcdDelayScreen1 = 44; //seconds displaying primary info
31int lcdDelayScreen2 =  8; //seconds displaying secondary info
32int lcdDelayScreen3 = 8; //seconds displaying  secondary info
33
34//these all have to match
35int loopCount = 60;  //total  loops 
36float dataPointT[60];  //temperature data points
37float dataPointB[60];  //pressure data points
38
39int mainLoop;  //primary loop
40int loopBaroGraph;  //secondary loop
41int loopTempGraph;  //secondary loop
42
43float currentTemp;
44float  currentHumid;
45
46float baroPressure;
47float currentPressure;
48
49float  tempDifference = 0;
50float tempValueComparative;
51
52int offset;
53int mt;
54int  mp;
55
56float pressDifference = 0;
57float pressValueComparative;
58
59//engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
60float  altitudeAdjustment = 1;
61
62float minTemp;
63float maxTemp;
64float minPressure;
65float  maxPressure;
66
67int rangeLowGraph;
68int rangeHighGraph;
69
70float percentOfCol;
71float  pixelHeightPercent;
72int pixelHeight;
73
74bool firstLoopComplete = false;
75
76//ethernet  client vars
77IPAddress server(192,168,1,35); 
78IPAddress ip(192, 168, 1, 250);
79IPAddress  myDns(192, 168, 1, 1);
80EthernetClient client;
81byte mac[] = { 0xDE, 0xAD, 0xBE,  0xEF, 0xFE, 0xED };
82String urlString;
83String temperatureToDB;
84String pressureToDB;
85String  humidityToDB;
86
87
88//define characters for temperature indicators
89byte  arrowUp[8] = {
90  B00100,
91  B01110,
92  B10101,
93  B00100,
94  B00100,
95  B00100,
96  B00100,
97  B00100,
98};
99
100byte arrowDown[8] = {
101  B00100,
102  B00100,
103  B00100,
104  B00100,
105  B00100,
106  B10101,
107  B01110,
108  B00100,
109};
110
111byte  equalSign[8] = {
112  B00100,
113  B01110,
114  B10101,
115  B00100,
116  B00100,
117  B10101,
118  B01110,
119  B00100,
120};
121
122byte row1[8] = {
123  B00000,
124  B00000,
125  B00000,
126  B00000,
127  B00000,
128  B00000,
129  B00000,
130  B11111,
131};
132
133byte  row2[8] = {
134  B00000,
135  B00000,
136  B00000,
137  B00000,
138  B00000,
139  B00000,
140  B11111,
141  B11111,
142};
143
144byte row3[8] = {
145  B00000,
146  B00000,
147  B00000,
148  B00000,
149  B00000,
150  B11111,
151  B11111,
152  B11111,
153};
154
155byte  row4[8] = {
156  B00000,
157  B00000,
158  B00000,
159  B00000,
160  B11111,
161  B11111,
162  B11111,
163  B11111,
164};
165
166byte row5[8] = {
167  B00000,
168  B00000,
169  B00000,
170  B11111,
171  B11111,
172  B11111,
173  B11111,
174  B11111,
175};
176
177byte  row6[8] = {
178  B00000,
179  B00000,
180  B11111,
181  B11111,
182  B11111,
183  B11111,
184  B11111,
185  B11111,
186};
187
188byte row7[8] = {
189  B00000,
190  B11111,
191  B11111,
192  B11111,
193  B11111,
194  B11111,
195  B11111,
196  B11111,
197};
198
199byte  row8[8] = {
200  B11111,
201  B11111,
202  B11111,
203  B11111,
204  B11111,
205  B11111,
206  B11111,
207  B11111,
208};
209
210void setup() {
211
212  int setupLoop;
213  bool dotPosition = true;
214
215  Serial.begin(9600); 
216
217  lcd.begin (20,4);
218
219  //Switch on the backlight
220  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
221  lcd.setBacklight(HIGH);
222  lcd.home ();
223
224  //delay a few seconds so the  sensors are ready
225  for (setupLoop = 1; setupLoop < 8; setupLoop++)
226  {
227    lcd.clear();
228    
229    if (dotPosition)
230    {
231      lcd.print("Initializing  .");
232      lcd.setCursor(0, 1);
233      lcd.print("WeatherStation v.1");
234      
235    }
236      else
237    {
238      lcd.print("Initializing  .");
239      lcd.setCursor(0, 1);
240      lcd.print("WeatherStation v.1");
241    }
242
243    dotPosition = !dotPosition;
244    delay(500);
245  }
246
247  //Check if BMP  280 is ready
248  lcd.setCursor(0, 2);
249  if (bmp280.initialize()) 
250  {
251    lcd.print("Barometer ready");
252  }
253    else
254  {
255    lcd.print("Barometer  error");
256  }
257
258  lcd.setCursor(0, 3);
259  
260  //check if DHT22 is ready
261  int chk = DHT.read22(DHT22_PIN);
262  switch (chk)
263  {
264    case DHTLIB_OK:  
265    lcd.print("Temp sensor ready"); 
266    break;
267    
268    case DHTLIB_ERROR_CHECKSUM:  
269    lcd.print("Temp checksum error"); 
270    break;
271    
272    case DHTLIB_ERROR_TIMEOUT:  
273    lcd.print("Temp timeout"); 
274    break;
275    
276    default: 
277    lcd.print("Temp sensor error"); 
278    break;
279  }
280
281  //leave info  on screen long enough
282  delay(2000);
283    
284  bmp280.setEnabled(0);
285  bmp280.triggerMeasurement();
286
287  bmp280.awaitMeasurement();
288  bmp280.getPressure(baroPressure);
289  DHT.read22(DHT22_PIN);
290
291  //populate baseline datapoints with startup values
292  int p;
293  for (p = 0;  p <= loopCount - 1; p++)
294  {
295    dataPointT[p] = DHT.temperature;
296    dataPointB[p]  = (baroPressure / 1000) + altitudeAdjustment;
297  }
298
299
300  lcd.clear();
301  if (Ethernet.begin(mac) == 0) 
302  {
303    lcd.print("Failed to configure Ethernet  using DHCP");
304    // Check for Ethernet hardware present
305    if (Ethernet.hardwareStatus()  == EthernetNoHardware) 
306    {
307      lcd.println("Ethernet shield not found");
308      //show failure flag
309    }
310    
311    if (Ethernet.linkStatus() == LinkOFF)  
312    {
313      lcd.print("Ethernet cable not connected.");
314    }
315    
316    // try to congifure using IP address instead of DHCP:
317    Ethernet.begin(mac,  ip, myDns);
318  } 
319    else 
320  {
321      lcd.print("Got IP via DHCP:");
322      lcd.setCursor(0, 1);
323      lcd.print(Ethernet.localIP());
324  }
325
326  //keep display up 
327  delay(2000);
328}
329
330void loop() {
331
332  for (mainLoop  = 0; mainLoop <= loopCount - 1; mainLoop++)
333  {
334    bmp280.awaitMeasurement();
335    
336    DHT.read22(DHT22_PIN);
337    currentTemp = DHT.temperature;
338    currentHumid  = DHT.humidity;
339
340    bmp280.getPressure(baroPressure);
341    bmp280.triggerMeasurement();
342    currentPressure = (baroPressure / 1000) + altitudeAdjustment;
343
344    //read  and store the array value before overwriting it
345    tempValueComparative = dataPointT[mainLoop];
346    dataPointT[mainLoop] = currentTemp;
347    tempDifference = currentTemp - tempValueComparative;
348
349    pressValueComparative = dataPointB[mainLoop];
350    dataPointB[mainLoop] =  currentPressure;
351    pressDifference = currentPressure - pressValueComparative;
352
353    //create lcd chars defined above
354    lcd.createChar(0, arrowUp);
355    lcd.createChar(1,  arrowDown);
356    lcd.createChar(2, equalSign);
357
358    //LCD Output begin
359    lcd.clear();
360    lcd.print(currentTemp, 1);
361    lcd.print((char)223);
362    lcd.print("C ");
363  
364    //determine which trend indicator to display
365    showTrendIndicator(tempDifference);
366
367    lcd.print(" ");
368  
369    //then  display the temperature diff
370    lcd.print(tempDifference);
371  
372    //move  to the next line and display humidity
373    lcd.setCursor(0, 1);
374    lcd.print(currentPressure,  1);
375    lcd.print(" kPa ");
376
377    showTrendIndicator(pressDifference);
378
379    lcd.print(" ");
380  
381    lcd.print(pressDifference);
382
383    lcd.setCursor(0,  2);
384    lcd.print(currentHumid, 1);
385    lcd.print(" % Rel Hum");
386
387    lcd.setCursor(0, 3);
388    lcd.print("Data age: ");
389
390    //this ensures  the 'data age' value displays the max after the first loop completes
391    if (!firstLoopComplete)
392    {
393      if (mainLoop < (loopCount - 1))
394      {
395        lcd.print(mainLoop);
396      }
397        else
398      {
399        lcd.print(loopCount);
400        firstLoopComplete  = true;
401      }
402    }
403      else
404    {
405      lcd.print(loopCount);
406    }
407    
408    lcd.print(" m");   
409
410    //send data to server every  10 minutes
411    if ((mainLoop == 0) || (mainLoop % 10 == 0))
412    {
413      temperatureToDB  = currentTemp;
414      pressureToDB = currentPressure;
415      humidityToDB =  currentHumid;
416      urlString = "GET /processincoming.php?t=" + temperatureToDB  + "&p=" + pressureToDB + "&h=" +  humidityToDB + " HTTP/1.1";
417      sendDataToServer(urlString);
418    }
419
420    //countdown until next screen
421    screenWaitRight(lcdDelayScreen1);
422    
423 //+++++++++++++++Screen 1 End+++++++++++++++
424
425    
426 //+++++++++++++++Screen  2 Start+++++++++++++++
427
428    //bar chart characters
429    lcd.createChar(0,  row1);
430    lcd.createChar(1, row2);
431    lcd.createChar(2, row3);
432    lcd.createChar(3,  row4);
433    lcd.createChar(4, row5);
434    lcd.createChar(5, row6);
435    lcd.createChar(6,  row7);
436    lcd.createChar(7, row8);
437
438    //initialize to something these  will never be
439    minTemp = 50;
440    maxTemp = -50;
441    //find min and max  temps
442    for (mt = 0; mt <= loopCount - 1; mt++)
443    {
444      //offset  value translates a negative result for 'mainLoop - mt' into the appropriate
445      //value in the array sequence
446      offset = getOffsetValue(mainLoop -  mt);
447      if (minTemp > dataPointT[offset])
448      {
449        minTemp =  dataPointT[offset];
450      }
451    }
452
453    for (mt = 0; mt <= loopCount  - 1; mt++)
454    {
455      offset = getOffsetValue(mainLoop - mt);
456      if  (maxTemp < dataPointT[offset])
457      {
458        maxTemp = dataPointT[offset];
459      }
460    }
461
462    //this sets the min/max range that the graph will show
463    rangeLowGraph = minTemp - 1.5;
464    rangeHighGraph = maxTemp + 1.5;
465       
466    lcd.clear();
467    lcd.setCursor(0, 0);
468    lcd.print((char)223);
469    lcd.print("C  ");
470    lcd.setCursor(0, 1);
471    lcd.print("H");
472    lcd.print(maxTemp,  1);
473    lcd.setCursor(0, 2);
474    lcd.print("L");
475    lcd.print(minTemp,  1);
476
477    for (loopTempGraph = 0; loopTempGraph <= loopCount - 1; loopTempGraph  += 4)
478    {
479      offset = getOffsetValue(mainLoop - loopTempGraph);
480      currentTemp  = dataPointT[offset];
481      //i add 50 so the values never go below zero
482      currentTemp = (currentTemp + 50) - (rangeLowGraph + 50);
483      percentOfCol  = currentTemp / ((rangeHighGraph + 50) - (rangeLowGraph + 50));
484      //32 =  total pixels vertical
485      pixelHeightPercent = 32 * percentOfCol;
486      pixelHeight  = pixelHeightPercent;
487      showGraphColumn(pixelHeight, loopTempGraph / 4);
488    }
489
490    screenWaitLeft(lcdDelayScreen2);
491    
492 //+++++++++++++++Screen  2 End+++++++++++++++
493
494
495 //+++++++++++++++Screen 3 Start+++++++++++++++
496    
497    //initialize to something these will never be
498    minPressure = 250;
499    maxPressure = 75;
500    //find min and max pressure
501    for (mp = 0; mp  <= loopCount - 1; mp++)
502    {
503      offset = getOffsetValue(mainLoop - mp);
504      if (minPressure > dataPointB[offset])
505      {
506        minPressure =  dataPointB[offset];
507      }
508    }
509
510    for (mp = 0; mp <= loopCount  - 1; mp++)
511    {
512      offset = getOffsetValue(mainLoop - mp);
513      if  (maxPressure < dataPointB[offset])
514      {
515        maxPressure = dataPointB[offset];
516      }
517    }
518   
519    lcd.clear();
520    lcd.setCursor(0, 0);
521    lcd.print("kPa");
522    lcd.setCursor(0, 1);
523    //lcd.print("H");  //doesn't fit on screen :(
524    lcd.print(maxPressure, 1);
525    lcd.setCursor(0, 2);
526    //lcd.print("L");  //doesn't fit on screen :(
527    lcd.print(minPressure, 1);
528
529    for (loopBaroGraph  = 0; loopBaroGraph <= loopCount - 1; loopBaroGraph += 4)
530    {   
531      offset  = getOffsetValue(mainLoop - loopBaroGraph);     
532      currentPressure = dataPointB[offset];
533      currentPressure = currentPressure - (minPressure - 1.5);
534      percentOfCol  = currentPressure / ((maxPressure + 1.5) - (minPressure - 1.5));
535      pixelHeightPercent  = 32 * percentOfCol;
536      pixelHeight = pixelHeightPercent;
537      showGraphColumn(pixelHeight,  loopBaroGraph / 4);   
538    }
539    
540    screenWaitLeft(lcdDelayScreen3);
541  
542  } //main for loop end 
543}
544
545void sendDataToServer(String stringToSend)
546{
547  Serial.println(stringToSend);
548  if (client.connect(server, 80)) 
549  {
550    client.println(stringToSend);
551    client.println("Host: 192.168.1.35");
552    client.println("Connection: close");
553    client.println();
554  }
555    else
556  {
557    // if you didn't get a connection to the server:
558    Serial.println("connection  failed");
559  }
560}
561
562int getOffsetValue(int z)
563{
564  if (z < 0)
565  {
566    return z + 60;
567  }
568    else
569  {
570    return z;
571  }
572}
573
574void  screenWaitRight(int secondsR)
575{
576  int a;
577  for (a = secondsR; a >= 0; a--)
578  {
579    lcd.setCursor(18, 3);
580    if(a >= 10)
581    {
582      lcd.print(a);
583    }
584      else
585    {
586      lcd.print(" ");
587      lcd.print(a);
588    }
589    delay(1000);
590  }
591}
592
593void screenWaitLeft(int secondsL)
594{
595  int b;
596  for (b = secondsL; b >= 0; b--)
597  {
598    lcd.setCursor(0, 3);
599    if(b >= 10)
600    {
601      lcd.print(b);
602    }
603      else
604    {
605      lcd.print(b);
606      lcd.print(" ");
607    }
608    delay(1000);
609  }
610}
611
612
613void showTrendIndicator(float val)
614{
615  if (val > 0)
616  {
617    lcd.write(byte(0));
618  }
619    else if (val < 0)
620  {
621    lcd.write(byte(1));
622  }
623    else
624  {  
625    lcd.write(byte(2));
626  }
627}
628 
629
630void  showGraphColumn(int pixelHeight, int c)
631{
632  switch (pixelHeight)
633  {
634    case 1:
635    lcd.setCursor(c + 5, 3);
636    lcd.write(byte(0));
637    break;
638    
639    case 2:
640    lcd.setCursor(c + 5, 3);
641    lcd.write(byte(1));
642    break;
643
644    case 3:
645    lcd.setCursor(c + 5, 3);
646    lcd.write(byte(2));
647    break;
648
649    case 4:
650    lcd.setCursor(c + 5, 3);
651    lcd.write(byte(3));
652    break;
653
654    case 5:
655    lcd.setCursor(c + 5, 3);
656    lcd.write(byte(4));
657    break;
658
659    case 6:
660    lcd.setCursor(c + 5, 3);
661    lcd.write(byte(5));
662    break;
663
664    case 7:
665    lcd.setCursor(c + 5, 3);
666    lcd.write(byte(6));
667    break;
668
669    case 8:
670    lcd.setCursor(c + 5, 3);
671    lcd.write(byte(7));
672    break;
673
674    case 9:
675    lcd.setCursor(c + 5, 3);
676    lcd.write(byte(7));
677    
678    lcd.setCursor(c + 5, 2);
679    lcd.write(byte(0));
680    break;
681
682    case 10:
683    lcd.setCursor(c + 5, 3);
684    lcd.write(byte(7));
685    
686    lcd.setCursor(c + 5, 2);
687    lcd.write(byte(1));
688    break;
689
690    case  11:
691    lcd.setCursor(c + 5, 3);
692    lcd.write(byte(7));
693    
694    lcd.setCursor(c  + 5, 2);
695    lcd.write(byte(2));
696    break;
697
698    case 12:
699    lcd.setCursor(c  + 5, 3);
700    lcd.write(byte(7));
701    
702    lcd.setCursor(c + 5, 2);
703    lcd.write(byte(3));
704    break;
705
706    case 13:
707    lcd.setCursor(c  + 5, 3);
708    lcd.write(byte(7));
709    
710    lcd.setCursor(c + 5, 2);
711    lcd.write(byte(4));
712    break;
713
714    case 14:
715    lcd.setCursor(c  + 5, 3);
716    lcd.write(byte(7));
717    
718    lcd.setCursor(c + 5, 2);
719    lcd.write(byte(5));
720    break;
721
722    case 15:
723    lcd.setCursor(c  + 5, 3);
724    lcd.write(byte(7));
725    
726    lcd.setCursor(c + 5, 2);
727    lcd.write(byte(6));
728    break;
729
730    case 16:
731    lcd.setCursor(c  + 5, 3);
732    lcd.write(byte(7));
733    
734    lcd.setCursor(c + 5, 2);
735    lcd.write(byte(7));
736    break;
737
738    case 17:
739    lcd.setCursor(c  + 5, 3);
740    lcd.write(byte(7));
741    
742    lcd.setCursor(c + 5, 2);
743    lcd.write(byte(7));
744
745    lcd.setCursor(c + 5, 1);
746    lcd.write(byte(0));
747    break;
748
749    case 18:
750    lcd.setCursor(c + 5, 3);
751    lcd.write(byte(7));
752    
753    lcd.setCursor(c + 5, 2);
754    lcd.write(byte(7));
755
756    lcd.setCursor(c  + 5, 1);
757    lcd.write(byte(1));
758    break;
759
760    case 19:
761    lcd.setCursor(c  + 5, 3);
762    lcd.write(byte(7));
763    
764    lcd.setCursor(c + 5, 2);
765    lcd.write(byte(7));
766
767    lcd.setCursor(c + 5, 1);
768    lcd.write(byte(2));
769    break;
770
771    case 20:
772    lcd.setCursor(c + 5, 3);
773    lcd.write(byte(7));
774    
775    lcd.setCursor(c + 5, 2);
776    lcd.write(byte(7));
777
778    lcd.setCursor(c  + 5, 1);
779    lcd.write(byte(3));
780    break;
781
782    case 21:
783    lcd.setCursor(c  + 5, 3);
784    lcd.write(byte(7));
785    
786    lcd.setCursor(c + 5, 2);
787    lcd.write(byte(7));
788
789    lcd.setCursor(c + 5, 1);
790    lcd.write(byte(4));
791    break;
792
793    case 22:
794    lcd.setCursor(c + 5, 3);
795    lcd.write(byte(7));
796    
797    lcd.setCursor(c + 5, 2);
798    lcd.write(byte(7));
799
800    lcd.setCursor(c  + 5, 1);
801    lcd.write(byte(5));
802    break;
803
804    case 23:
805    lcd.setCursor(c  + 5, 3);
806    lcd.write(byte(7));
807    
808    lcd.setCursor(c + 5, 2);
809    lcd.write(byte(7));
810
811    lcd.setCursor(c + 5, 1);
812    lcd.write(byte(6));
813    break;
814
815    case 24:
816    lcd.setCursor(c + 5, 3);
817    lcd.write(byte(7));
818    
819    lcd.setCursor(c + 5, 2);
820    lcd.write(byte(7));
821
822    lcd.setCursor(c  + 5, 1);
823    lcd.write(byte(7));
824    break;
825
826    case 25:
827    lcd.setCursor(c  + 5, 3);
828    lcd.write(byte(7));
829    
830    lcd.setCursor(c + 5, 2);
831    lcd.write(byte(7));
832
833    lcd.setCursor(c + 5, 1);
834    lcd.write(byte(7));
835
836    lcd.setCursor(c + 5, 0);
837    lcd.write(byte(0));
838    break;
839
840    case  26:
841    lcd.setCursor(c + 5, 3);
842    lcd.write(byte(7));
843    
844    lcd.setCursor(c  + 5, 2);
845    lcd.write(byte(7));
846
847    lcd.setCursor(c + 5, 1);
848    lcd.write(byte(7));
849
850    lcd.setCursor(c + 5, 0);
851    lcd.write(byte(1));
852    break;
853
854    case  27:
855    lcd.setCursor(c + 5, 3);
856    lcd.write(byte(7));
857    
858    lcd.setCursor(c  + 5, 2);
859    lcd.write(byte(7));
860
861    lcd.setCursor(c + 5, 1);
862    lcd.write(byte(7));
863
864    lcd.setCursor(c + 5, 0);
865    lcd.write(byte(2));
866    break;
867
868    case  28:
869    lcd.setCursor(c + 5, 3);
870    lcd.write(byte(7));
871    
872    lcd.setCursor(c  + 5, 2);
873    lcd.write(byte(7));
874
875    lcd.setCursor(c + 5, 1);
876    lcd.write(byte(7));
877
878    lcd.setCursor(c + 5, 0);
879    lcd.write(byte(3));
880    break;
881
882    case  29:
883    lcd.setCursor(c + 5, 3);
884    lcd.write(byte(7));
885    
886    lcd.setCursor(c  + 5, 2);
887    lcd.write(byte(7));
888
889    lcd.setCursor(c + 5, 1);
890    lcd.write(byte(7));
891
892    lcd.setCursor(c + 5, 0);
893    lcd.write(byte(4));
894    break;
895
896    case  30:
897    lcd.setCursor(c + 5, 3);
898    lcd.write(byte(7));
899    
900    lcd.setCursor(c  + 5, 2);
901    lcd.write(byte(7));
902
903    lcd.setCursor(c + 5, 1);
904    lcd.write(byte(7));
905
906    lcd.setCursor(c + 5, 0);
907    lcd.write(byte(5));
908    break;
909
910    case  31:
911    lcd.setCursor(c + 5, 3);
912    lcd.write(byte(7));
913    
914    lcd.setCursor(c  + 5, 2);
915    lcd.write(byte(7));
916
917    lcd.setCursor(c + 5, 1);
918    lcd.write(byte(7));
919
920    lcd.setCursor(c + 5, 0);
921    lcd.write(byte(6));
922    break;
923
924    case  32:
925    lcd.setCursor(c + 5, 3);
926    lcd.write(byte(7));
927    
928    lcd.setCursor(c  + 5, 2);
929    lcd.write(byte(7));
930
931    lcd.setCursor(c + 5, 1);
932    lcd.write(byte(7));
933
934    lcd.setCursor(c + 5, 0);
935    lcd.write(byte(7));
936    break;
937  }
938}
939

#include <LCD.h>
#include <LiquidCrystal_I2C.h>
//#include <Wire.h>
#include  <dht.h>
#include "i2c.h"
#include "i2c_BMP280.h"
#include <SPI.h>
#include  <Ethernet.h>

dht DHT;
BMP280 bmp280;

//specify the temp sensor
#define  DHTTYPE DHT22;
#define DHT22_PIN 6

#define I2C_ADDR    0x27  // Define  I2C Address where the PCF8574A is
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7

LiquidCrystal_I2C  lcd(I2C_ADDR,  En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin);

//total delay =  (lcdDelayScreen1 + lcdDelayScreen2 + lcdDelayScreen3) * loopCount (in seconds)
int  lcdDelayScreen1 = 44; //seconds displaying primary info
int lcdDelayScreen2 =  8; //seconds displaying secondary info
int lcdDelayScreen3 = 8; //seconds displaying  secondary info

//these all have to match
int loopCount = 60;  //total  loops 
float dataPointT[60];  //temperature data points
float dataPointB[60];  //pressure data points

int mainLoop;  //primary loop
int loopBaroGraph;  //secondary loop
int loopTempGraph;  //secondary loop

float currentTemp;
float  currentHumid;

float baroPressure;
float currentPressure;

float  tempDifference = 0;
float tempValueComparative;

int offset;
int mt;
int  mp;

float pressDifference = 0;
float pressValueComparative;

//engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
float  altitudeAdjustment = 1;

float minTemp;
float maxTemp;
float minPressure;
float  maxPressure;

int rangeLowGraph;
int rangeHighGraph;

float percentOfCol;
float  pixelHeightPercent;
int pixelHeight;

bool firstLoopComplete = false;

//ethernet  client vars
IPAddress server(192,168,1,35); 
IPAddress ip(192, 168, 1, 250);
IPAddress  myDns(192, 168, 1, 1);
EthernetClient client;
byte mac[] = { 0xDE, 0xAD, 0xBE,  0xEF, 0xFE, 0xED };
String urlString;
String temperatureToDB;
String pressureToDB;
String  humidityToDB;


//define characters for temperature indicators
byte  arrowUp[8] = {
  B00100,
  B01110,
  B10101,
  B00100,
  B00100,
  B00100,
  B00100,
  B00100,
};

byte arrowDown[8] = {
  B00100,
  B00100,
  B00100,
  B00100,
  B00100,
  B10101,
  B01110,
  B00100,
};

byte  equalSign[8] = {
  B00100,
  B01110,
  B10101,
  B00100,
  B00100,
  B10101,
  B01110,
  B00100,
};

byte row1[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
};

byte  row2[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
};

byte row3[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
};

byte  row4[8] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
  B11111,
};

byte row5[8] = {
  B00000,
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
};

byte  row6[8] = {
  B00000,
  B00000,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
};

byte row7[8] = {
  B00000,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
};

byte  row8[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
};

void setup() {

  int setupLoop;
  bool dotPosition = true;

  Serial.begin(9600); 

  lcd.begin (20,4);

  //Switch on the backlight
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
  lcd.home ();

  //delay a few seconds so the  sensors are ready
  for (setupLoop = 1; setupLoop < 8; setupLoop++)
  {
    lcd.clear();
    
    if (dotPosition)
    {
      lcd.print("Initializing  .");
      lcd.setCursor(0, 1);
      lcd.print("WeatherStation v.1");
      
    }
      else
    {
      lcd.print("Initializing  .");
      lcd.setCursor(0, 1);
      lcd.print("WeatherStation v.1");
    }

    dotPosition = !dotPosition;
    delay(500);
  }

  //Check if BMP  280 is ready
  lcd.setCursor(0, 2);
  if (bmp280.initialize()) 
  {
    lcd.print("Barometer ready");
  }
    else
  {
    lcd.print("Barometer  error");
  }

  lcd.setCursor(0, 3);
  
  //check if DHT22 is ready
  int chk = DHT.read22(DHT22_PIN);
  switch (chk)
  {
    case DHTLIB_OK:  
    lcd.print("Temp sensor ready"); 
    break;
    
    case DHTLIB_ERROR_CHECKSUM:  
    lcd.print("Temp checksum error"); 
    break;
    
    case DHTLIB_ERROR_TIMEOUT:  
    lcd.print("Temp timeout"); 
    break;
    
    default: 
    lcd.print("Temp sensor error"); 
    break;
  }

  //leave info  on screen long enough
  delay(2000);
    
  bmp280.setEnabled(0);
  bmp280.triggerMeasurement();

  bmp280.awaitMeasurement();
  bmp280.getPressure(baroPressure);
  DHT.read22(DHT22_PIN);

  //populate baseline datapoints with startup values
  int p;
  for (p = 0;  p <= loopCount - 1; p++)
  {
    dataPointT[p] = DHT.temperature;
    dataPointB[p]  = (baroPressure / 1000) + altitudeAdjustment;
  }


  lcd.clear();
  if (Ethernet.begin(mac) == 0) 
  {
    lcd.print("Failed to configure Ethernet  using DHCP");
    // Check for Ethernet hardware present
    if (Ethernet.hardwareStatus()  == EthernetNoHardware) 
    {
      lcd.println("Ethernet shield not found");
      //show failure flag
    }
    
    if (Ethernet.linkStatus() == LinkOFF)  
    {
      lcd.print("Ethernet cable not connected.");
    }
    
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac,  ip, myDns);
  } 
    else 
  {
      lcd.print("Got IP via DHCP:");
      lcd.setCursor(0, 1);
      lcd.print(Ethernet.localIP());
  }

  //keep display up 
  delay(2000);
}

void loop() {

  for (mainLoop  = 0; mainLoop <= loopCount - 1; mainLoop++)
  {
    bmp280.awaitMeasurement();
    
    DHT.read22(DHT22_PIN);
    currentTemp = DHT.temperature;
    currentHumid  = DHT.humidity;

    bmp280.getPressure(baroPressure);
    bmp280.triggerMeasurement();
    currentPressure = (baroPressure / 1000) + altitudeAdjustment;

    //read  and store the array value before overwriting it
    tempValueComparative = dataPointT[mainLoop];
    dataPointT[mainLoop] = currentTemp;
    tempDifference = currentTemp - tempValueComparative;

    pressValueComparative = dataPointB[mainLoop];
    dataPointB[mainLoop] =  currentPressure;
    pressDifference = currentPressure - pressValueComparative;

    //create lcd chars defined above
    lcd.createChar(0, arrowUp);
    lcd.createChar(1,  arrowDown);
    lcd.createChar(2, equalSign);

    //LCD Output begin
    lcd.clear();
    lcd.print(currentTemp, 1);
    lcd.print((char)223);
    lcd.print("C ");
  
    //determine which trend indicator to display
    showTrendIndicator(tempDifference);

    lcd.print(" ");
  
    //then  display the temperature diff
    lcd.print(tempDifference);
  
    //move  to the next line and display humidity
    lcd.setCursor(0, 1);
    lcd.print(currentPressure,  1);
    lcd.print(" kPa ");

    showTrendIndicator(pressDifference);

    lcd.print(" ");
  
    lcd.print(pressDifference);

    lcd.setCursor(0,  2);
    lcd.print(currentHumid, 1);
    lcd.print(" % Rel Hum");

    lcd.setCursor(0, 3);
    lcd.print("Data age: ");

    //this ensures  the 'data age' value displays the max after the first loop completes
    if (!firstLoopComplete)
    {
      if (mainLoop < (loopCount - 1))
      {
        lcd.print(mainLoop);
      }
        else
      {
        lcd.print(loopCount);
        firstLoopComplete  = true;
      }
    }
      else
    {
      lcd.print(loopCount);
    }
    
    lcd.print(" m");   

    //send data to server every  10 minutes
    if ((mainLoop == 0) || (mainLoop % 10 == 0))
    {
      temperatureToDB  = currentTemp;
      pressureToDB = currentPressure;
      humidityToDB =  currentHumid;
      urlString = "GET /processincoming.php?t=" + temperatureToDB  + "&p=" + pressureToDB + "&h=" +  humidityToDB + " HTTP/1.1";
      sendDataToServer(urlString);
    }

    //countdown until next screen
    screenWaitRight(lcdDelayScreen1);
    
 //+++++++++++++++Screen 1 End+++++++++++++++

    
 //+++++++++++++++Screen  2 Start+++++++++++++++

    //bar chart characters
    lcd.createChar(0,  row1);
    lcd.createChar(1, row2);
    lcd.createChar(2, row3);
    lcd.createChar(3,  row4);
    lcd.createChar(4, row5);
    lcd.createChar(5, row6);
    lcd.createChar(6,  row7);
    lcd.createChar(7, row8);

    //initialize to something these  will never be
    minTemp = 50;
    maxTemp = -50;
    //find min and max  temps
    for (mt = 0; mt <= loopCount - 1; mt++)
    {
      //offset  value translates a negative result for 'mainLoop - mt' into the appropriate
      //value in the array sequence
      offset = getOffsetValue(mainLoop -  mt);
      if (minTemp > dataPointT[offset])
      {
        minTemp =  dataPointT[offset];
      }
    }

    for (mt = 0; mt <= loopCount  - 1; mt++)
    {
      offset = getOffsetValue(mainLoop - mt);
      if  (maxTemp < dataPointT[offset])
      {
        maxTemp = dataPointT[offset];
      }
    }

    //this sets the min/max range that the graph will show
    rangeLowGraph = minTemp - 1.5;
    rangeHighGraph = maxTemp + 1.5;
       
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print((char)223);
    lcd.print("C  ");
    lcd.setCursor(0, 1);
    lcd.print("H");
    lcd.print(maxTemp,  1);
    lcd.setCursor(0, 2);
    lcd.print("L");
    lcd.print(minTemp,  1);

    for (loopTempGraph = 0; loopTempGraph <= loopCount - 1; loopTempGraph  += 4)
    {
      offset = getOffsetValue(mainLoop - loopTempGraph);
      currentTemp  = dataPointT[offset];
      //i add 50 so the values never go below zero
      currentTemp = (currentTemp + 50) - (rangeLowGraph + 50);
      percentOfCol  = currentTemp / ((rangeHighGraph + 50) - (rangeLowGraph + 50));
      //32 =  total pixels vertical
      pixelHeightPercent = 32 * percentOfCol;
      pixelHeight  = pixelHeightPercent;
      showGraphColumn(pixelHeight, loopTempGraph / 4);
    }

    screenWaitLeft(lcdDelayScreen2);
    
 //+++++++++++++++Screen  2 End+++++++++++++++


 //+++++++++++++++Screen 3 Start+++++++++++++++
    
    //initialize to something these will never be
    minPressure = 250;
    maxPressure = 75;
    //find min and max pressure
    for (mp = 0; mp  <= loopCount - 1; mp++)
    {
      offset = getOffsetValue(mainLoop - mp);
      if (minPressure > dataPointB[offset])
      {
        minPressure =  dataPointB[offset];
      }
    }

    for (mp = 0; mp <= loopCount  - 1; mp++)
    {
      offset = getOffsetValue(mainLoop - mp);
      if  (maxPressure < dataPointB[offset])
      {
        maxPressure = dataPointB[offset];
      }
    }
   
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("kPa");
    lcd.setCursor(0, 1);
    //lcd.print("H");  //doesn't fit on screen :(
    lcd.print(maxPressure, 1);
    lcd.setCursor(0, 2);
    //lcd.print("L");  //doesn't fit on screen :(
    lcd.print(minPressure, 1);

    for (loopBaroGraph  = 0; loopBaroGraph <= loopCount - 1; loopBaroGraph += 4)
    {   
      offset  = getOffsetValue(mainLoop - loopBaroGraph);     
      currentPressure = dataPointB[offset];
      currentPressure = currentPressure - (minPressure - 1.5);
      percentOfCol  = currentPressure / ((maxPressure + 1.5) - (minPressure - 1.5));
      pixelHeightPercent  = 32 * percentOfCol;
      pixelHeight = pixelHeightPercent;
      showGraphColumn(pixelHeight,  loopBaroGraph / 4);   
    }
    
    screenWaitLeft(lcdDelayScreen3);
  
  } //main for loop end 
}

void sendDataToServer(String stringToSend)
{
  Serial.println(stringToSend);
  if (client.connect(server, 80)) 
  {
    client.println(stringToSend);
    client.println("Host: 192.168.1.35");
    client.println("Connection: close");
    client.println();
  }
    else
  {
    // if you didn't get a connection to the server:
    Serial.println("connection  failed");
  }
}

int getOffsetValue(int z)
{
  if (z < 0)
  {
    return z + 60;
  }
    else
  {
    return z;
  }
}

void  screenWaitRight(int secondsR)
{
  int a;
  for (a = secondsR; a >= 0; a--)
  {
    lcd.setCursor(18, 3);
    if(a >= 10)
    {
      lcd.print(a);
    }
      else
    {
      lcd.print(" ");
      lcd.print(a);
    }
    delay(1000);
  }
}

void screenWaitLeft(int secondsL)
{
  int b;
  for (b = secondsL; b >= 0; b--)
  {
    lcd.setCursor(0, 3);
    if(b >= 10)
    {
      lcd.print(b);
    }
      else
    {
      lcd.print(b);
      lcd.print(" ");
    }
    delay(1000);
  }
}


void showTrendIndicator(float val)
{
  if (val > 0)
  {
    lcd.write(byte(0));
  }
    else if (val < 0)
  {
    lcd.write(byte(1));
  }
    else
  {  
    lcd.write(byte(2));
  }
}
 

void  showGraphColumn(int pixelHeight, int c)
{
  switch (pixelHeight)
  {
    case 1:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(0));
    break;
    
    case 2:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(1));
    break;

    case 3:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(2));
    break;

    case 4:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(3));
    break;

    case 5:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(4));
    break;

    case 6:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(5));
    break;

    case 7:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(6));
    break;

    case 8:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    break;

    case 9:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(0));
    break;

    case 10:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(1));
    break;

    case  11:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(2));
    break;

    case 12:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(3));
    break;

    case 13:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(4));
    break;

    case 14:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(5));
    break;

    case 15:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(6));
    break;

    case 16:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));
    break;

    case 17:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(0));
    break;

    case 18:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c  + 5, 1);
    lcd.write(byte(1));
    break;

    case 19:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(2));
    break;

    case 20:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c  + 5, 1);
    lcd.write(byte(3));
    break;

    case 21:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(4));
    break;

    case 22:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c  + 5, 1);
    lcd.write(byte(5));
    break;

    case 23:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(6));
    break;

    case 24:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c  + 5, 1);
    lcd.write(byte(7));
    break;

    case 25:
    lcd.setCursor(c  + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(0));
    break;

    case  26:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(1));
    break;

    case  27:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(2));
    break;

    case  28:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(3));
    break;

    case  29:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(4));
    break;

    case  30:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(5));
    break;

    case  31:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(6));
    break;

    case  32:
    lcd.setCursor(c + 5, 3);
    lcd.write(byte(7));
    
    lcd.setCursor(c  + 5, 2);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 1);
    lcd.write(byte(7));

    lcd.setCursor(c + 5, 0);
    lcd.write(byte(7));
    break;
  }
}

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Weather Station v1

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