SMS Temperature Reply

Send an SMS to the Arduino requesting the ambient temperature and get a reply.

Apr 9, 2017

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21286 views

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8 respects

temperature

sms

mobile

Components and supplies

Breadboard (generic)

Resistor 10k ohm

Arduino Mega 2560

Jumper wires (generic)

SIM800L

DHT22 Temperature Sensor

Project description

Code

DHT_SIMPosting.ino

arduino

Send SMS "InTemp" requests the temperature and the Arduino reply's in Degrees C.

1// Example testing sketch for various DHT humidity/temperature sensors
2//   Written by ladyada, public domain
3
4#include "DHT.h"
5
6#define DHTPIN   2     // what digital pin we're connected to
7#define DHTTYPE DHT22   // DHT 22   (AM2302), AM2321
8//#define DHTTYPE DHT21   // DHT 21 (AM2301)
9
10// Connect   pin 1 (on the left) of the sensor to +5V
11// Connect pin 2 of the sensor to whatever   your DHTPIN is
12// Connect pin 4 (on the right) of the sensor to GROUND
13//   Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
14
15//   Initialize DHT sensor.
16DHT dht(DHTPIN, DHTTYPE);
17
18#include <gprs.h>
19#include   <softwareserial.h>
20#define TIMEOUT    5000
21GPRS gprs;
22bool ITemp = false;
23float   temp;
24String MyString;
25#define LED_PIN    13
26bool ledStatus;
27//Variable   to hold last line of serial output from SIM800
28char currentLine[500] = "";
29int   currentLineIndex = 0;
30//Boolean to be set to true if message notificaion was   found and next
31//line of serial output is the actual SMS message content
32bool   nextLineIsMessage = false;
33
34void Reply ()// Function starts here
35{
36   Serial.println("GPRS - Send SMS Test ...");
37  gprs.preInit();
38  delay(1000);
39   while(0 != gprs.init()) {
40      delay(1000);
41      Serial.print("init error\
\
42");
43   }  
44  Serial.println("Init success, start to send SMS message...");
45  if   (ITemp == true){
46  float t = dht.readTemperature();
47  temp=t;
48  ITemp =   false;
49  
50  
51 }
52
53    MyString = String(temp,0); //Convert float to   String
54     MyString = (MyString + " Degrees C");
55     
56       // convert   string to char starts here
57          // Length (with one extra character for   the null terminator)
58          int str_len = MyString.length() + 1; 
59          //   Prepare the character array (the buffer) 
60          char char_array[str_len];
61           // Copy it over 
62          MyString.toCharArray(char_array, str_len);
63        // convert string to char ends here
64
65  
66  gprs.sendSMS("04++++++++",char_array);   //define phone number and text
67  // Function ends here
68}
69void setup() {
70   Serial.begin(9600);
71  Serial.println("DHTxx test!");
72
73  dht.begin();
74     gprs.preInit();
75  delay(1000);
76 
77  while(0 != gprs.init()) {
78      delay(1000);
79       Serial.print("init error\
\
80");
81      //later display SIM ERROR on   Nextion HMI Home Page
82  } 
83 
84  //Set SMS mode to ASCII
85  if(0 != gprs.sendCmdAndWaitForResp("AT+CMGF=1\
\
86",   "OK", TIMEOUT)) {
87    ERROR("ERROR:CNMI");
88    return;
89  }
90   
91   //Start listening to New SMS Message Indications
92  if(0 != gprs.sendCmdAndWaitForResp("AT+CNMI=1,2,0,0,0\
\
93",   "OK", TIMEOUT)) {
94    ERROR("ERROR:CNMI");
95    return;
96  }
97 
98   Serial.println("Init success");
99
100}
101
102void loop() {
103  // Wait a   few seconds between measurements.
104  delay(2000);
105
106  // Reading temperature   or humidity takes about 250 milliseconds!
107  // Sensor readings may also be up   to 2 seconds 'old' (its a very slow sensor)
108  float h = dht.readHumidity();
109   // Read temperature as Celsius (the default)
110  float t = dht.readTemperature();
111   
112
113  Serial.print("Humidity: ");
114  Serial.print(h);
115  Serial.println("   %\	");
116  Serial.print("Temperature: ");
117  Serial.print(t);
118  Serial.println("   *C ");
119  
120 SIM();
121}
122void SIM()
123{
124   //Write current status to   LED pin
125  digitalWrite(LED_PIN, ledStatus);
126   Serial.println("Looking for   SMS");
127  //If there is serial output from SIM800
128  if(gprs.serialSIM800.available()){
129     char lastCharRead = gprs.serialSIM800.read();
130    //Read each character from   serial output until \
 or \
131 is reached (which denotes end of line)
132    if(lastCharRead   == '\
' || lastCharRead == '\
133'){
134        String lastLine = String(currentLine);
135          
136        //If last line read +CMT, New SMS Message Indications was received.
137         //Hence, next line is the message content.
138        if(lastLine.startsWith("+CMT:")){
139            
140          Serial.println(lastLine);
141          nextLineIsMessage   = true;
142           
143        } else if (lastLine.length() > 0) {
144           
145           if(nextLineIsMessage) {
146            Serial.println(lastLine);
147             
148             //Read message content and set status according to SMS content
149            if(lastLine.indexOf("InTemp")   >= 0){
150               Serial.println("InTemp");
151               ITemp = true;
152               Reply ();
153             // ledStatus = 1;
154                 //   Serial.println("Turn ON the Light");
155           // } else if(lastLine.indexOf("LED   OFF") >= 0) {
156             // ledStatus = 0;
157             // Serial.println("Turn   OFF the Light");
158            }
159          
160             
161            nextLineIsMessage   = false;
162          }
163           
164        }
165         
166        //Clear   char array for next line of read
167        for( int i = 0; i < sizeof(currentLine);   ++i ) {
168         currentLine[i] = (char)0;
169        }
170        currentLineIndex   = 0;
171    } else {
172      currentLine[currentLineIndex++] = lastCharRead;
173     }
174  }
175}
176

// Example testing sketch for various DHT humidity/temperature sensors
//   Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN   2     // what digital pin we're connected to
#define DHTTYPE DHT22   // DHT 22   (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect   pin 1 (on the left) of the sensor to +5V
// Connect pin 2 of the sensor to whatever   your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
//   Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

//   Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);

#include <gprs.h>
#include   <softwareserial.h>
#define TIMEOUT    5000
GPRS gprs;
bool ITemp = false;
float   temp;
String MyString;
#define LED_PIN    13
bool ledStatus;
//Variable   to hold last line of serial output from SIM800
char currentLine[500] = "";
int   currentLineIndex = 0;
//Boolean to be set to true if message notificaion was   found and next
//line of serial output is the actual SMS message content
bool   nextLineIsMessage = false;

void Reply ()// Function starts here
{
   Serial.println("GPRS - Send SMS Test ...");
  gprs.preInit();
  delay(1000);
   while(0 != gprs.init()) {
      delay(1000);
      Serial.print("init error\
\
");
   }  
  Serial.println("Init success, start to send SMS message...");
  if   (ITemp == true){
  float t = dht.readTemperature();
  temp=t;
  ITemp =   false;
  
  
 }

    MyString = String(temp,0); //Convert float to   String
     MyString = (MyString + " Degrees C");
     
       // convert   string to char starts here
          // Length (with one extra character for   the null terminator)
          int str_len = MyString.length() + 1; 
          //   Prepare the character array (the buffer) 
          char char_array[str_len];
           // Copy it over 
          MyString.toCharArray(char_array, str_len);
        // convert string to char ends here

  
  gprs.sendSMS("04++++++++",char_array);   //define phone number and text
  // Function ends here
}
void setup() {
   Serial.begin(9600);
  Serial.println("DHTxx test!");

  dht.begin();
     gprs.preInit();
  delay(1000);
 
  while(0 != gprs.init()) {
      delay(1000);
       Serial.print("init error\
\
");
      //later display SIM ERROR on   Nextion HMI Home Page
  } 
 
  //Set SMS mode to ASCII
  if(0 != gprs.sendCmdAndWaitForResp("AT+CMGF=1\
\
",   "OK", TIMEOUT)) {
    ERROR("ERROR:CNMI");
    return;
  }
   
   //Start listening to New SMS Message Indications
  if(0 != gprs.sendCmdAndWaitForResp("AT+CNMI=1,2,0,0,0\
\
",   "OK", TIMEOUT)) {
    ERROR("ERROR:CNMI");
    return;
  }
 
   Serial.println("Init success");

}

void loop() {
  // Wait a   few seconds between measurements.
  delay(2000);

  // Reading temperature   or humidity takes about 250 milliseconds!
  // Sensor readings may also be up   to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
   // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
   

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println("   %\	");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println("   *C ");
  
 SIM();
}
void SIM()
{
   //Write current status to   LED pin
  digitalWrite(LED_PIN, ledStatus);
   Serial.println("Looking for   SMS");
  //If there is serial output from SIM800
  if(gprs.serialSIM800.available()){
     char lastCharRead = gprs.serialSIM800.read();
    //Read each character from   serial output until \
 or \
 is reached (which denotes end of line)
    if(lastCharRead   == '\
' || lastCharRead == '\
'){
        String lastLine = String(currentLine);
          
        //If last line read +CMT, New SMS Message Indications was received.
         //Hence, next line is the message content.
        if(lastLine.startsWith("+CMT:")){
            
          Serial.println(lastLine);
          nextLineIsMessage   = true;
           
        } else if (lastLine.length() > 0) {
           
           if(nextLineIsMessage) {
            Serial.println(lastLine);
             
             //Read message content and set status according to SMS content
            if(lastLine.indexOf("InTemp")   >= 0){
               Serial.println("InTemp");
               ITemp = true;
               Reply ();
             // ledStatus = 1;
                 //   Serial.println("Turn ON the Light");
           // } else if(lastLine.indexOf("LED   OFF") >= 0) {
             // ledStatus = 0;
             // Serial.println("Turn   OFF the Light");
            }
          
             
            nextLineIsMessage   = false;
          }
           
        }
         
        //Clear   char array for next line of read
        for( int i = 0; i < sizeof(currentLine);   ++i ) {
         currentLine[i] = (char)0;
        }
        currentLineIndex   = 0;
    } else {
      currentLine[currentLineIndex++] = lastCharRead;
     }
  }
}

DHT_SIMPosting.ino

arduino

Send SMS "InTemp" requests the temperature and the Arduino reply's in Degrees C.

1// Example testing sketch for various DHT humidity/temperature sensors
2//  Written by ladyada, public domain
3
4#include "DHT.h"
5
6#define DHTPIN  2     // what digital pin we're connected to
7#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
8//#define DHTTYPE DHT21   // DHT 21 (AM2301)
9
10// Connect  pin 1 (on the left) of the sensor to +5V
11// Connect pin 2 of the sensor to whatever  your DHTPIN is
12// Connect pin 4 (on the right) of the sensor to GROUND
13//  Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
14
15//  Initialize DHT sensor.
16DHT dht(DHTPIN, DHTTYPE);
17
18#include <gprs.h>
19#include  <softwareserial.h>
20#define TIMEOUT    5000
21GPRS gprs;
22bool ITemp = false;
23float  temp;
24String MyString;
25#define LED_PIN    13
26bool ledStatus;
27//Variable  to hold last line of serial output from SIM800
28char currentLine[500] = "";
29int  currentLineIndex = 0;
30//Boolean to be set to true if message notificaion was  found and next
31//line of serial output is the actual SMS message content
32bool  nextLineIsMessage = false;
33
34void Reply ()// Function starts here
35{
36  Serial.println("GPRS - Send SMS Test ...");
37  gprs.preInit();
38  delay(1000);
39  while(0 != gprs.init()) {
40      delay(1000);
41      Serial.print("init error\
\
42");
43  }  
44  Serial.println("Init success, start to send SMS message...");
45  if  (ITemp == true){
46  float t = dht.readTemperature();
47  temp=t;
48  ITemp =  false;
49  
50  
51 }
52
53    MyString = String(temp,0); //Convert float to  String
54     MyString = (MyString + " Degrees C");
55     
56       // convert  string to char starts here
57          // Length (with one extra character for  the null terminator)
58          int str_len = MyString.length() + 1; 
59          //  Prepare the character array (the buffer) 
60          char char_array[str_len];
61          // Copy it over 
62          MyString.toCharArray(char_array, str_len);
63       // convert string to char ends here
64
65  
66  gprs.sendSMS("04++++++++",char_array);  //define phone number and text
67  // Function ends here
68}
69void setup() {
70  Serial.begin(9600);
71  Serial.println("DHTxx test!");
72
73  dht.begin();
74    gprs.preInit();
75  delay(1000);
76 
77  while(0 != gprs.init()) {
78      delay(1000);
79      Serial.print("init error\
\
80");
81      //later display SIM ERROR on  Nextion HMI Home Page
82  } 
83 
84  //Set SMS mode to ASCII
85  if(0 != gprs.sendCmdAndWaitForResp("AT+CMGF=1\
\
86",  "OK", TIMEOUT)) {
87    ERROR("ERROR:CNMI");
88    return;
89  }
90   
91  //Start listening to New SMS Message Indications
92  if(0 != gprs.sendCmdAndWaitForResp("AT+CNMI=1,2,0,0,0\
\
93",  "OK", TIMEOUT)) {
94    ERROR("ERROR:CNMI");
95    return;
96  }
97 
98  Serial.println("Init success");
99
100}
101
102void loop() {
103  // Wait a  few seconds between measurements.
104  delay(2000);
105
106  // Reading temperature  or humidity takes about 250 milliseconds!
107  // Sensor readings may also be up  to 2 seconds 'old' (its a very slow sensor)
108  float h = dht.readHumidity();
109  // Read temperature as Celsius (the default)
110  float t = dht.readTemperature();
111  
112
113  Serial.print("Humidity: ");
114  Serial.print(h);
115  Serial.println("  %\	");
116  Serial.print("Temperature: ");
117  Serial.print(t);
118  Serial.println("  *C ");
119  
120 SIM();
121}
122void SIM()
123{
124   //Write current status to  LED pin
125  digitalWrite(LED_PIN, ledStatus);
126   Serial.println("Looking for  SMS");
127  //If there is serial output from SIM800
128  if(gprs.serialSIM800.available()){
129    char lastCharRead = gprs.serialSIM800.read();
130    //Read each character from  serial output until \
 or \
131 is reached (which denotes end of line)
132    if(lastCharRead  == '\r' || lastCharRead == '\n'){
133        String lastLine = String(currentLine);
134         
135        //If last line read +CMT, New SMS Message Indications was received.
136        //Hence, next line is the message content.
137        if(lastLine.startsWith("+CMT:")){
138           
139          Serial.println(lastLine);
140          nextLineIsMessage  = true;
141           
142        } else if (lastLine.length() > 0) {
143           
144          if(nextLineIsMessage) {
145            Serial.println(lastLine);
146             
147            //Read message content and set status according to SMS content
148            if(lastLine.indexOf("InTemp")  >= 0){
149               Serial.println("InTemp");
150               ITemp = true;
151              Reply ();
152             // ledStatus = 1;
153                 //  Serial.println("Turn ON the Light");
154           // } else if(lastLine.indexOf("LED  OFF") >= 0) {
155             // ledStatus = 0;
156             // Serial.println("Turn  OFF the Light");
157            }
158          
159             
160            nextLineIsMessage  = false;
161          }
162           
163        }
164         
165        //Clear  char array for next line of read
166        for( int i = 0; i < sizeof(currentLine);  ++i ) {
167         currentLine[i] = (char)0;
168        }
169        currentLineIndex  = 0;
170    } else {
171      currentLine[currentLineIndex++] = lastCharRead;
172    }
173  }
174}
175

// Example testing sketch for various DHT humidity/temperature sensors
//  Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN  2     // what digital pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect  pin 1 (on the left) of the sensor to +5V
// Connect pin 2 of the sensor to whatever  your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
//  Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

//  Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);

#include <gprs.h>
#include  <softwareserial.h>
#define TIMEOUT    5000
GPRS gprs;
bool ITemp = false;
float  temp;
String MyString;
#define LED_PIN    13
bool ledStatus;
//Variable  to hold last line of serial output from SIM800
char currentLine[500] = "";
int  currentLineIndex = 0;
//Boolean to be set to true if message notificaion was  found and next
//line of serial output is the actual SMS message content
bool  nextLineIsMessage = false;

void Reply ()// Function starts here
{
  Serial.println("GPRS - Send SMS Test ...");
  gprs.preInit();
  delay(1000);
  while(0 != gprs.init()) {
      delay(1000);
      Serial.print("init error\
\
");
  }  
  Serial.println("Init success, start to send SMS message...");
  if  (ITemp == true){
  float t = dht.readTemperature();
  temp=t;
  ITemp =  false;
  
  
 }

    MyString = String(temp,0); //Convert float to  String
     MyString = (MyString + " Degrees C");
     
       // convert  string to char starts here
          // Length (with one extra character for  the null terminator)
          int str_len = MyString.length() + 1; 
          //  Prepare the character array (the buffer) 
          char char_array[str_len];
          // Copy it over 
          MyString.toCharArray(char_array, str_len);
       // convert string to char ends here

  
  gprs.sendSMS("04++++++++",char_array);  //define phone number and text
  // Function ends here
}
void setup() {
  Serial.begin(9600);
  Serial.println("DHTxx test!");

  dht.begin();
    gprs.preInit();
  delay(1000);
 
  while(0 != gprs.init()) {
      delay(1000);
      Serial.print("init error\
\
");
      //later display SIM ERROR on  Nextion HMI Home Page
  } 
 
  //Set SMS mode to ASCII
  if(0 != gprs.sendCmdAndWaitForResp("AT+CMGF=1\
\
",  "OK", TIMEOUT)) {
    ERROR("ERROR:CNMI");
    return;
  }
   
  //Start listening to New SMS Message Indications
  if(0 != gprs.sendCmdAndWaitForResp("AT+CNMI=1,2,0,0,0\
\
",  "OK", TIMEOUT)) {
    ERROR("ERROR:CNMI");
    return;
  }
 
  Serial.println("Init success");

}

void loop() {
  // Wait a  few seconds between measurements.
  delay(2000);

  // Reading temperature  or humidity takes about 250 milliseconds!
  // Sensor readings may also be up  to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println("  %\	");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println("  *C ");
  
 SIM();
}
void SIM()
{
   //Write current status to  LED pin
  digitalWrite(LED_PIN, ledStatus);
   Serial.println("Looking for  SMS");
  //If there is serial output from SIM800
  if(gprs.serialSIM800.available()){
    char lastCharRead = gprs.serialSIM800.read();
    //Read each character from  serial output until \
 or \
 is reached (which denotes end of line)
    if(lastCharRead  == '\r' || lastCharRead == '\n'){
        String lastLine = String(currentLine);
         
        //If last line read +CMT, New SMS Message Indications was received.
        //Hence, next line is the message content.
        if(lastLine.startsWith("+CMT:")){
           
          Serial.println(lastLine);
          nextLineIsMessage  = true;
           
        } else if (lastLine.length() > 0) {
           
          if(nextLineIsMessage) {
            Serial.println(lastLine);
             
            //Read message content and set status according to SMS content
            if(lastLine.indexOf("InTemp")  >= 0){
               Serial.println("InTemp");
               ITemp = true;
              Reply ();
             // ledStatus = 1;
                 //  Serial.println("Turn ON the Light");
           // } else if(lastLine.indexOf("LED  OFF") >= 0) {
             // ledStatus = 0;
             // Serial.println("Turn  OFF the Light");
            }
          
             
            nextLineIsMessage  = false;
          }
           
        }
         
        //Clear  char array for next line of read
        for( int i = 0; i < sizeof(currentLine);  ++i ) {
         currentLine[i] = (char)0;
        }
        currentLineIndex  = 0;
    } else {
      currentLine[currentLineIndex++] = lastCharRead;
    }
  }
}

Downloadable files

DHT22 SIM

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