Project tutorial
DRS For Water Filtration System

DRS For Water Filtration System © GPL3+

I am building a water filter replenishment system using Amazon DRS by monitoring the water usage.

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Components and supplies

Water Flow Sensor Fluid Flowmeter Switch for Water Heater Imprinter
×1
Abx00004 iso both
Arduino MKR1000
×1

Apps and online services

Simpleicon sns
Amazon Web Services AWS SNS
Icon
Amazon Web Services Amazon Dash Replenishment Service
Microsoft azure logo 7qghkhuibq
Microsoft Azure
Ide web
Arduino IDE

About this project

Introduction

Water filters have a life span. After filtration of certain volume of water, the filters need to be changed to maintain the water quality. Hence, it is important to replenish a new filter when it expires. I am building a water filter replenishment system using Amazon DRS by monitoring the water usage.

Create an LWA Security Profile

To create an LWA security profile, follow this link.

Create an SNS Topic

To create an SNS topic, follow this link.

Create the DRS4WFS device

Visit this link to start the Device Wizard. Below are a few screen captures of the device creation process.

Replenishment Test with Postman

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Device Registration and Subscription

Visit the registration and subscription link and click Get started.

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The device Model ID will be displayed and you need to key in the Serial #. Then click Login with Amazon.

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Login with your Amazon credential.

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You will be presented with choices of Cartridge for your selection.

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Click the Complete Setup.

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Registration Complete

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In your mail box. You will see a few DRS notifications.

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Below are the Device Registered and Subscription Changed notification.

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Here is the email notification showing your DRS subscription status.

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This is the Auto Reorder Overview where you can change the subscription.

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If an order replenishment was made, you will receive the ItemShippedNotification and the OrderPlacedNotification.

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At the same time, you will get an order placed email like below.

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The Sketch

In test mode, the sketch will send an order replenishment every X litre of water flowing thru where X is currently set to 1. In real life, X could be a number over thousands in value.

   // Print the cumulative total of litres flowed since starting 
   Serial.print("  Output Liquid Quantity: ");             // Output separator 
   Serial.print(totalMilliLitres); 
   Serial.println("mL");  
   // send to web app for order replenishment for every Litre of water 
   if (totalMilliLitres > litresCount * 1000) { 
     litresCount++; 
     sendOrderReplenishment(); 
   } 

This is the code which sends an order replenishment to the product web app on Azure cloud.

 void sendOrderReplenishment() { 
 // close any connection before send a new request. 
 // This will free the socket on the WiFi shield 
 client.stop(); 
 String contentType = "text/plain"; 
 // if there's a successful connection: 
 if (client.connect(hostname, 80)) { 
   //make the GET request 
   client.print("GET ");  //Do a GET 
   client.print(feeduri);  // On the feedURI 
   client.println(" HTTP/1.1");  
   client.print("Host: ");  
   client.println(hostname);  //with hostname header 
   client.println("Connection: close"); 
   client.print("Content-Type: "); 
   client.println(contentType); 
   client.println(); 
   Serial.println(); 
   Serial.println(">>> send order replenishment <<<"); 
 } 
 else { 
   // if you couldn't make a connection: 
   Serial.println(); 
   Serial.println("connection failed"); 
 } 
} 

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The Code

The Consent Request code is in javascript.

 	<script type="text/javascript"> 
		document.getElementById('LoginWithAmazon').onclick = function() { 
		var device = 'fe152d18-4d66-49d1-a3e4-118d1c509b06'; 
		var serial = document.getElementById("serial_no").value;   // '1234567890'; 
		var returnurl = 'https://wesee.azurewebsites.net/lwa/handle_drs.php?device=' + device + '&serial=' + serial; 
		var options = new Object(); 
		var scope = ('dash:replenish'); 
		var scope_data = new Object(); 
		scope_data['dash:replenish'] = {"device_model":device ,"serial":serial ,"is_test_device":true}; 
		options['scope_data'] = scope_data; 
		options['scope'] = scope; 
		options['response_type'] = 'code'; 
		amazon.Login.authorize(options, returnurl); 
		return false; 
		}; 
	</script> 

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The Refresh and Access Token code is in PHP.

	$grant_type = 'authorization_code';  
	$client_id = 'amzn1.application-oa2-client.dd7238f2130d48179c24da58bacac020'; //your client id  
	$client_secret = '743b49b3e0b5537600a8fc8b65fb06da451f5e81fea85390413cec2351be10c9'; //your client secret	  
	$device = urlencode($_REQUEST['device']); 
	$serial = urlencode($_REQUEST['serial']); 
	$code =  urlencode($_REQUEST['code']); //the code is retured as a parameter in the query string once the user logs in  
	$data = array("grant_type"=>$grant_type, "code" => $code, "client_id"=> $client_id, "client_secret"=> $client_secret);  
	$postvars = '';  
	foreach($data as $key=>$value) {  
	$postvars .= $key . "=" . $value . "&";  
	}  
	$c = curl_init('https://api.amazon.com/auth/o2/token');   
	curl_setopt($c, CURLOPT_CUSTOMREQUEST, "POST");  
	curl_setopt($c, CURLOPT_POSTFIELDS, $postvars);  
	curl_setopt($c, CURLOPT_RETURNTRANSFER, true);  
	curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false); 
	curl_setopt($c, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded;charset=UTF-8'));  
	$r = curl_exec($c);  
	curl_close($c);  

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The access token and refresh token are stored in a mysql table on Azure cloud during device registration. The code is in PHP.

 		$access_token = $ra['access_token'];  
		$refresh_token = $ra['refresh_token'];  
		$expires_in = $ra['expires_in'];  
		try { 
			 $date = date("Y-m-d"); 
			 // Insert data 
			 $sql_insert = "INSERT INTO drs_tbl (device, serial, code, access_token, refresh_token, expires_in, date)  
							VALUES (?,?,?,?,?,?,?)"; 
			 $stmt = $conn->prepare($sql_insert); 
			 $stmt->bindValue(1, $device); 
			 $stmt->bindValue(2, $serial); 
			 $stmt->bindValue(3, $code); 
			 $stmt->bindValue(4, $access_token); 
			 $stmt->bindValue(5, $refresh_token); 
			 $stmt->bindValue(6, $expires_in); 
			 $stmt->bindValue(7, $date); 
			 $stmt->execute(); 
		 } 
		 catch(Exception $e) { 
			 die(var_dump($e)); 
		 } 

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The Request New Refresh and Access Tokens code is in PHP.

$data = array("grant_type"=>$grant_type, "refresh_token" => $refresh_token, "client_id"=> $client_id, "client_secret"=> $client_secret);  
	$postvars = '';  
	foreach($data as $key=>$value) {  
	$postvars .= $key . "=" . $value . "&";  
	}  
	$c = curl_init('https://api.amazon.com/auth/o2/token');   
	curl_setopt($c, CURLOPT_CUSTOMREQUEST, "POST");  
	curl_setopt($c, CURLOPT_POSTFIELDS, $postvars);  
	curl_setopt($c, CURLOPT_RETURNTRANSFER, true);  
	curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false); 
	curl_setopt($c, CURLOPT_HTTPHEADER, array('Content-Type:application/x-www-form-urlencoded'));  
	$r = curl_exec($c);  

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The Order Replenishment code is in PHP.

	$slot_id = "dbdf9606-0c52-4f48-8995-af33638f6ccc"; 
	$c = curl_init('https://dash-replenishment-service-na.amazon.com/replenish/' . $slot_id);   
	curl_setopt($c, CURLOPT_CUSTOMREQUEST, "POST");  
	curl_setopt($c, CURLOPT_RETURNTRANSFER, true);  
	curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false); 
	curl_setopt($c, CURLOPT_HTTPHEADER, array('Authorization:Bearer ' . $access_token,  
	'x-amzn-accept-type:com.amazon.dash.replenishment.DrsReplenishResult@1.0', 
	'x-amzn-type-version:com.amazon.dash.replenishment.DrsReplenishInput@1.0',  
	'Content-Type:application/x-www-form-urlencoded'));  
	$r = curl_exec($c);  

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Future Enhancements

This project at current stage has quite a few rough edges. Here are some enhancements which will make the product more user friendly.

  • Allow WiFi setting to be configuratable from web interface or mobile app. Currently the setting is hardcoded in the sketch.
  • Implement more DRS endpoints
  • Build a more robust web app which enable customers to view and monitor the current status of the device.

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Code

index.htmlHTML
Device registration
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                <span class="title">Order only what you need</span>
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                <span>Order physical goods from Amazon when supplies are running low.</span>
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                <span>Amazon will automatically ship you new filtration catridges before you run out.</span>
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		width="156" height="32" />
	</a>
	</div>
</div>
	
	<script type="text/javascript">

		document.getElementById('LoginWithAmazon').onclick = function() {
		var device = 'fe152d18-4d66-49d1-a3e4-118d1c509b06';
		var serial = document.getElementById("serial_no").value;   // '1234567890';
		var returnurl = 'https://wesee.azurewebsites.net/lwa/handle_drs.php?device=' + device + '&serial=' + serial;
		var options = new Object();
		var scope = ('dash:replenish');
		var scope_data = new Object();
		scope_data['dash:replenish'] = {"device_model":device ,"serial":serial ,"is_test_device":true};
		options['scope_data'] = scope_data;
		options['scope'] = scope;
		options['response_type'] = 'code';
		amazon.Login.authorize(options, returnurl);
		return false;
		};

	</script>
                

		
		
		
		
		
    </div>
</div>
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</div>

<noscript>
    <img height="1" width="1" style='display:none;visibility:hidden;' src='//fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:161-9726678-7749403:KEPNZPAP23MACWK7175G$uedata=s:%2Fgp%2Fuedata%3Fnoscript%26id%3DKEPNZPAP23MACWK7175G:0' alt=""/>
</noscript>
</div></body></html>
handle_drs.phpPHP
Handle the redirect url
<html> 
<body> 
<?php 
	//var_dump($_REQUEST);
	
	$grant_type = 'authorization_code'; 
	$client_id = 'your client id'; //your client id 
	$client_secret = 'your client secret'; //your client secret	 
	$device = urlencode($_REQUEST['device']);
	$serial = urlencode($_REQUEST['serial']);
	$code =  urlencode($_REQUEST['code']); //the code is retured as a parameter in the query string once the user logs in 
	$data = array("grant_type"=>$grant_type, "code" => $code, "client_id"=> $client_id, "client_secret"=> $client_secret); 
	$postvars = ''; 
	foreach($data as $key=>$value) { 
	$postvars .= $key . "=" . $value . "&"; 
	} 
	$c = curl_init('https://api.amazon.com/auth/o2/token');  
	curl_setopt($c, CURLOPT_CUSTOMREQUEST, "POST"); 
	curl_setopt($c, CURLOPT_POSTFIELDS, $postvars); 
	curl_setopt($c, CURLOPT_RETURNTRANSFER, true); 
	curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);
	curl_setopt($c, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded;charset=UTF-8')); 
	$r = curl_exec($c); 
	curl_close($c); 
	$ra = json_decode($r, true); 
	if (isset($ra['error']) == true){ //there was an error obtaining the auth token 
		echo '<h3>There was an error authenticating with Amazon. Can you please start over again? Click <a href="/drs4wfs/">here</a> to start again.</h3>'	; 
	} else { 
	
		// DB connection info
		$host = "ap-cdbr-azure-southeast-b.cloudapp.net:3306";  //db host
		$user = "db user";  //db user
		$pwd = "db password";  //db password
		$db = "db name";  //db name
		 
		 // Connect to database.
		 try {
			 $conn = new PDO( "mysql:host=$host;dbname=$db", $user, $pwd);
			 $conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
		 }
		 catch(Exception $e){
			 die(var_dump($e));
		 }


		$access_token = $ra['access_token']; 
		$refresh_token = $ra['refresh_token']; 
		$expires_in = $ra['expires_in']; 

		try {
			 $date = date("Y-m-d");
			 // Insert data
			 $sql_insert = "INSERT INTO drs_tbl (device, serial, code, access_token, refresh_token, expires_in, date) 
							VALUES (?,?,?,?,?,?,?)";
			 $stmt = $conn->prepare($sql_insert);
			 $stmt->bindValue(1, $device);
			 $stmt->bindValue(2, $serial);
			 $stmt->bindValue(3, $code);
			 $stmt->bindValue(4, $access_token);
			 $stmt->bindValue(5, $refresh_token);
			 $stmt->bindValue(6, $expires_in);
			 $stmt->bindValue(7, $date);
			 $stmt->execute();
		 }
		 catch(Exception $e) {
			 die(var_dump($e));
		 }

 
		echo "<h1>Registration complete.</h1>";
		
		//$access_token = $ra['access_token']; 
		//$refresh_token = $ra['refresh_token']; 
		//var_dump($ra);
		//echo 'access token -> ' . $access_token . '<br/>';
		//echo 'refresh token -> ' .  $refresh_token . '<br/>';
		
	} 
?> 
</body> 
</html> 
refresh_drs.phpPHP
Refresh token
<html> 
<body> 
<?php 
	//var_dump($_REQUEST);
	
	$device = urlencode($_REQUEST['device']);
	$serial = urlencode($_REQUEST['serial']);

	// DB connection info
	$host = "ap-cdbr-azure-southeast-b.cloudapp.net:3306";
	$user = "db user";   // db user
	$pwd = "db password";   // db password
	$db = "db name";   // db name
	 
	// Connect to database.
	try {
		$conn = new PDO( "mysql:host=$host;dbname=$db", $user, $pwd);
		$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
	}
	catch(Exception $e){
		die(var_dump($e));
	}

	try {
		// Select data
		$sql_select = "SELECT refresh_token FROM drs_tbl WHERE device = ? AND serial = ?";
		$stmt = $conn->prepare($sql_select);
		$stmt->bindValue(1, $device);
		$stmt->bindValue(2, $serial);
		$stmt->execute();
		
		$row = $stmt->fetch(PDO::FETCH_ASSOC);
		//echo "<br/>>>> old refresh token <<< " . $row['refresh_token'] . "<br/>";
		$refresh_token = $row['refresh_token'];
	 }
	 catch(Exception $e) {
		die(var_dump($e));
	 }


	$grant_type = 'refresh_token'; 
	$client_id = 'your client id'; //your client id 
	$client_secret = 'your client secret'; //your client secret	
	//$refresh_token = '';
	$data = array("grant_type"=>$grant_type, "refresh_token" => $refresh_token, "client_id"=> $client_id, "client_secret"=> $client_secret); 
	$postvars = ''; 
	foreach($data as $key=>$value) { 
	$postvars .= $key . "=" . $value . "&"; 
	} 

	$c = curl_init('https://api.amazon.com/auth/o2/token');  
	curl_setopt($c, CURLOPT_CUSTOMREQUEST, "POST"); 
	curl_setopt($c, CURLOPT_POSTFIELDS, $postvars); 
	curl_setopt($c, CURLOPT_RETURNTRANSFER, true); 
	curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);
	curl_setopt($c, CURLOPT_HTTPHEADER, array('Content-Type:application/x-www-form-urlencoded')); 
	$r = curl_exec($c); 
	$httpcode = curl_getinfo($c, CURLINFO_HTTP_CODE);  
	curl_close($c); 
	//echo "<br/>>>> httpcode <<< " . $httpcode . "<br/>";

	$ra = json_decode($r, true); 
	//echo "<br/><br/>";
	//var_dump($ra); 
	//echo "<br/><br/>";
		
	if ($httpcode != 200){ 
		echo '<h3>There was an error during token refresh.</h3>'	; 
	} else { 
	 
		try {
			// Update data
			$sql_update = "UPDATE drs_tbl SET access_token = ?, expires_in = ? WHERE device = ? AND serial = ?";
			$stmt = $conn->prepare($sql_update);
			$stmt->bindValue(1, $ra['access_token']);
			$stmt->bindValue(2, $ra['expires_in']);
			$stmt->bindValue(3, $device);
			$stmt->bindValue(4, $serial);
			$stmt->execute();
			
		 }
		 catch(Exception $e) {
			die(var_dump($e));
		 }

		 echo "<h1>Token refresh complete.</h1>";
		
	} 
?> 
</body> 
</html> 
replenish_drs.phpPHP
Replenish order
<html> 
<body> 
<?php 
	//var_dump($_REQUEST);
	
	$device = urlencode($_REQUEST['device']);
	$serial = urlencode($_REQUEST['serial']);

	// DB connection info
	$host = "ap-cdbr-azure-southeast-b.cloudapp.net:3306";
	$user = "db user";  // db user
	$pwd = "db password";  // db password
	$db = "db name";  // db name
	 
	// Connect to database.
	try {
		$conn = new PDO( "mysql:host=$host;dbname=$db", $user, $pwd);
		$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
	}
	catch(Exception $e){
		die(var_dump($e));
	}

	try {
		// Select data
		$sql_select = "SELECT access_token FROM drs_tbl WHERE device = ? AND serial = ?";
		$stmt = $conn->prepare($sql_select);
		$stmt->bindValue(1, $device);
		$stmt->bindValue(2, $serial);
		$stmt->execute();
		
		$row = $stmt->fetch(PDO::FETCH_ASSOC);
		//echo "<br/>>>> access token <<< " . $row['access_token'] . "<br/>";
		$access_token = $row['access_token'];
	 }
	 catch(Exception $e) {
		die(var_dump($e));
	 }

	$slot_id = "dbdf9606-0c52-4f48-8995-af33638f6ccc";
	$c = curl_init('https://dash-replenishment-service-na.amazon.com/replenish/' . $slot_id);  
	curl_setopt($c, CURLOPT_CUSTOMREQUEST, "POST"); 
	curl_setopt($c, CURLOPT_RETURNTRANSFER, true); 
	curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);
	curl_setopt($c, CURLOPT_HTTPHEADER, array('Authorization:Bearer ' . $access_token, 
	'x-amzn-accept-type:com.amazon.dash.replenishment.DrsReplenishResult@1.0',
	'x-amzn-type-version:com.amazon.dash.replenishment.DrsReplenishInput@1.0', 
	'Content-Type:application/x-www-form-urlencoded')); 
	$r = curl_exec($c); 
	$httpcode = curl_getinfo($c, CURLINFO_HTTP_CODE);  
	curl_close($c); 
	//echo ">>> httpcode <<< " . $httpcode . "<br/>";

	$ra = json_decode($r, true); 
	//echo "<br/><br/>";
	//var_dump($ra); 
	//echo "<br/><br/>";
		
	if ($httpcode != 200){ 
		echo '<h3>There was an error during order replenishment.</h3>'	; 
	} else { 
	 
		echo "<h1>Replenishment complete.</h1>";
		
	} 
?> 
</body> 
</html> 
waterflow_drs.inoC/C++
/*
Liquid flow rate sensor -DIYhacking.com Arvind Sanjeev

Measure the liquid/water flow rate using this code. 
Connect Vcc and Gnd of sensor to arduino, and the 
signal line to arduino digital pin 2.
 
 */
#include <WiFi101.h>

byte statusLed    = 13;

byte sensorInterrupt = 0;  // 0 = digital pin 2
byte sensorPin       = 2;

// The hall-effect flow sensor outputs approximately 4.5 pulses per second per
// litre/minute of flow.
float calibrationFactor = 4.5;

volatile byte pulseCount;  

float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;

unsigned long oldTime;

char ssid[] = "your network ssid";      // your network SSID (name)
char pass[] = "your network password";   // your network password

char hostname[] = "wesee.azurewebsites.net";    // host name address for your Azure web app
char feeduri[] = "/lwa/replenish_drs.php?device=fe152d18-4d66-49d1-a3e4-118d1c509b06&serial=2xUJugQmFBNn"; //feed URI (device + serial)

int status = WL_IDLE_STATUS;
WiFiClient client;

unsigned int litresCount;

void setup()
{
  
  // Initialize a serial connection for reporting values to the host
  Serial.begin(38400);

   
  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);
  }

  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    delay(10000);
  }
  
  // you're connected now, so print out the status:
  printWifiStatus();


    
  // Set up the status LED line as an output
  pinMode(statusLed, OUTPUT);
  digitalWrite(statusLed, HIGH);  // We have an active-low LED attached
  
  pinMode(sensorPin, INPUT);
  digitalWrite(sensorPin, HIGH);

  pulseCount        = 0;
  flowRate          = 0.0;
  flowMilliLitres   = 0;
  totalMilliLitres  = 0;
  oldTime           = 0;

  litresCount = 1;

  // The Hall-effect sensor is connected to pin 2 which uses interrupt 0.
  // Configured to trigger on a FALLING state change (transition from HIGH
  // state to LOW state)
  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}

/**
 * Main program loop
 */
void loop()
{
  String response = "";
  char c;
  // read response if WiFi Client is available
  while (client.available()) {
    c = client.read();
    response.concat(c);
  }
  
  if((millis() - oldTime) > 1000)    // Only process counters once per second
  { 
    // Disable the interrupt while calculating flow rate and sending the value to
    // the host
    detachInterrupt(sensorInterrupt);
        
    // Because this loop may not complete in exactly 1 second intervals we calculate
    // the number of milliseconds that have passed since the last execution and use
    // that to scale the output. We also apply the calibrationFactor to scale the output
    // based on the number of pulses per second per units of measure (litres/minute in
    // this case) coming from the sensor.
    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
    
    // Note the time this processing pass was executed. Note that because we've
    // disabled interrupts the millis() function won't actually be incrementing right
    // at this point, but it will still return the value it was set to just before
    // interrupts went away.
    oldTime = millis();
    
    // Divide the flow rate in litres/minute by 60 to determine how many litres have
    // passed through the sensor in this 1 second interval, then multiply by 1000 to
    // convert to millilitres.
    flowMilliLitres = (flowRate / 60) * 1000;
    
    // Add the millilitres passed in this second to the cumulative total
    totalMilliLitres += flowMilliLitres;
      
    unsigned int frac;
    
    // Print the flow rate for this second in litres / minute
    Serial.print("Flow rate: ");
    Serial.print(int(flowRate));  // Print the integer part of the variable
    Serial.print(".");             // Print the decimal point
    // Determine the fractional part. The 10 multiplier gives us 1 decimal place.
    frac = (flowRate - int(flowRate)) * 10;
    Serial.print(frac, DEC) ;      // Print the fractional part of the variable
    Serial.print("L/min");
    // Print the number of litres flowed in this second
    Serial.print("  Current Liquid Flowing: ");             // Output separator
    Serial.print(flowMilliLitres);
    Serial.print("mL/Sec");

    // Print the cumulative total of litres flowed since starting
    Serial.print("  Output Liquid Quantity: ");             // Output separator
    Serial.print(totalMilliLitres);
    Serial.println("mL"); 

    // send to web app for order replenishment for every Litre of water
    if (totalMilliLitres > litresCount * 1000) {
      litresCount++;
      sendOrderReplenishment();
    }
    
    // Reset the pulse counter so we can start incrementing again
    pulseCount = 0;
    
    // Enable the interrupt again now that we've finished sending output
    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
  }
}

/*
Insterrupt Service Routine
 */
void pulseCounter()
{
  // Increment the pulse counter
  pulseCount++;
}

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  IPAddress subnet = WiFi.subnetMask();
  Serial.print("Netmask: ");
  Serial.println(subnet);

  IPAddress gateway = WiFi.gatewayIP();
  Serial.print("Gateway: ");
  Serial.println(gateway);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

void sendOrderReplenishment() {

  // close any connection before send a new request.
  // This will free the socket on the WiFi shield
  client.stop();

  String contentType = "text/plain";
  
  // if there's a successful connection:
  if (client.connect(hostname, 80)) {
    //make the GET request
    client.print("GET ");  //Do a GET
    client.print(feeduri);  // On the feedURI
    client.println(" HTTP/1.1"); 
    client.print("Host: "); 
    client.println(hostname);  //with hostname header
    client.println("Connection: close");

    client.print("Content-Type: ");
    client.println(contentType);

    client.println();

    Serial.println();
    Serial.println(">>> send order replenishment <<<");

  }
  else {
    // if you couldn't make a connection:
    Serial.println();
    Serial.println("connection failed");
  }
  
}

Schematics

schema_waterflow_jpKI0Rzvx1.jpg
Schema waterflow jpki0rzvx1

Comments

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