Project tutorial

Arduino - Web-Based Thermometer © GPL3+

This project allows you to check temperature at home from anywhere using web browser.

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  • 14 comments
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Components and supplies

About this project

If you are a beginner, you can learn about Arduino here.

I made a similar project using only PHPoC here.

Demo

Data Flow

Arduino ---> PHPoC WiFi Shield ---> Web browser

Arduino reads temperature from sensor and send the temperature value to PHPoC WiFi Shield. When receiving the temperature value, PHPoC WiFi Shield send it to Web Browser via websocket. JavaScript function visualizes the temperature value on UI.

Note that: PHPoC shield has a built-in program to pass data from Arduino to web browser. Therefore, we don't need to care about it.

What We Need to Do

  • Set WiFi information for PHPoC shield (SSID and password)
  • Upload new UI to PHPoC shield
  • Write Arduino code

Setting WiFi Information for PHPoC Shield

See this instruction.

Upload new Web UI to PHPoC Shield

Write Arduino Code

Testing

  • Click serial button on Arduino IDE to see the IP address.
  • Open web browser, type http:// replace_ip_address/remote_thermometer.php
  • Click connect button and test it.

Code

Arduino CodeArduino
#include <OneWire.h>
#include <DallasTemperature.h>
#include "SPI.h"
#include "Phpoc.h"

// Data wire is plugged into port 8 on the Arduino
OneWire oneWire(8);
DallasTemperature sensors(&oneWire);

PhpocServer server(80);
boolean alreadyConnected = false; 

void setup() {
	Serial.begin(9600);
	while(!Serial)
		;
	
	sensors.begin();

	Phpoc.begin(PF_LOG_SPI | PF_LOG_NET);

	server.beginWebSocket("thermometer");

	Serial.print("WebSocket server address : ");
	Serial.println(Phpoc.localIP());	
}

void loop() {
	// when the client sends the first byte, say hello:
	PhpocClient client = server.available();
	
	if (client) {
		sensors.requestTemperatures(); 
		float temp = sensors.getTempCByIndex(0);
		String txtMsg = String(temp) + "\r\n";  
		char buf[txtMsg.length()];
		txtMsg.toCharArray(buf, txtMsg.length());
		server.write(buf, txtMsg.length());
		delay(300);
	}
}
remote_thermometer.phpPHP
This file provide web user interface. Upload this file to PHPoC Wifi Shield or PHPoC Shield according to the described instruction.
<!DOCTYPE html>
<html>
<head>
<title>Arduino - PHPoC Shield - Thermometer</title>
<meta name="viewport" content="width=device-width, initial-scale=0.7, maximum-scale=0.7">
<meta charset="utf-8">
<style>
body { text-align: center; font-size: width/2pt; }
h1 { font-weight: bold; font-size: width/2pt; }
h2 { font-weight: bold; font-size: width/2pt; }
button { font-weight: bold; font-size: width/2pt; }
</style>
<script>
var canvas_width = 200, canvas_height = 450;

var ws;
var buffer = "";

function init()
{
	var canvas = document.getElementById("remote");
	//canvas.style.backgroundColor = "#999999";
	canvas.width = canvas_width;
	canvas.height = canvas_height;
	
	var ctx = canvas.getContext("2d");
	
	ctx.translate(canvas_width/2, canvas_height - 80);
	
	update_view(0);
}
function connect_onclick()
{
	if(ws == null)
	{
		var ws_host_addr = "<?echo _SERVER("HTTP_HOST")?>";
		if((navigator.platform.indexOf("Win") != -1) && (ws_host_addr.charAt(0) == "["))
		{
			// network resource identifier to UNC path name conversion
			ws_host_addr = ws_host_addr.replace(/[\[\]]/g, '');
			ws_host_addr = ws_host_addr.replace(/:/g, "-");
			ws_host_addr += ".ipv6-literal.net";
		}
		
		ws = new WebSocket("ws://" + ws_host_addr + "/thermometer", "text.phpoc");
		document.getElementById("ws_state").innerHTML = "CONNECTING";
		ws.onopen = ws_onopen;
		ws.onclose = ws_onclose;
		ws.onmessage = ws_onmessage;
		//ws.binaryType = "arraybuffer";
	}
	else
		ws.close();
}
function ws_onopen()
{
	document.getElementById("ws_state").innerHTML = "<font color='blue'>CONNECTED</font>";
	document.getElementById("bt_connect").innerHTML = "Disconnect";
	ws.send("B\r\n");
	update_view(0);
}
function ws_onclose()
{
	document.getElementById("ws_state").innerHTML = "<font color='gray'>CLOSED</font>";
	document.getElementById("bt_connect").innerHTML = "Connect";
	ws.onopen = null;
	ws.onclose = null;
	ws.onmessage = null;
	ws = null;
	update_view(0);
}
function ws_onmessage(e_msg)
{
	e_msg = e_msg || window.event; // MessageEvent
	
	console.log(e_msg.data);
	
	update_view(parseFloat(e_msg.data));
}
function update_view(temp)
{
	var canvas = document.getElementById("remote");
	var ctx = canvas.getContext("2d");
	
	var radius = 70;
	var offset = 5;
	var width = 45;
	var height = 330;
 
	ctx.clearRect(-canvas_width/2, -350, canvas_width, canvas_height);
	
	if(ws != null)
	{
		ctx.strokeStyle="blue";
		ctx.fillStyle="blue";
	}
	else
	{
		ctx.strokeStyle="Gray";
		ctx.fillStyle="Gray";
	}
	
	//5-step Degree
	var x = -width/2;
	ctx.lineWidth=2;
	for (var i = 0; i <= 100; i+=5)
	{
		var y = -(height - radius)*i/100 - radius - 5;
		ctx.beginPath();
		ctx.lineTo(x, y);
		ctx.lineTo(x - 20, y);
		ctx.stroke();
	}
	
	//20-step Degree
	ctx.lineWidth=5;
	for (var i = 0; i <= 100; i+=20)
	{
		var y = -(height - radius)*i/100 - radius - 5;
		ctx.beginPath();
		ctx.lineTo(x, y);
		ctx.lineTo(x - 25, y);
		ctx.stroke();
		
		ctx.font="20px Georgia";
		ctx.textBaseline="middle"; 
		ctx.textAlign="right";
		ctx.fillText(i.toString(), x - 35, y);
	}
	
	// shape
	ctx.lineWidth=16;
	ctx.beginPath();
	ctx.arc(0, 0, radius, 0, 2 * Math.PI);
	ctx.stroke();
	
	ctx.beginPath();
	ctx.rect(-width/2, -height, width, height); 
	ctx.stroke();
	
	ctx.beginPath();
	ctx.arc(0, -height, width/2, 0, 2 * Math.PI);
	ctx.stroke();
	
	ctx.fillStyle="#e6e6ff";
	ctx.beginPath();
	ctx.arc(0, 0, radius, 0, 2 * Math.PI);
	ctx.fill();
	
	ctx.beginPath();
	ctx.rect(-width/2, -height, width, height); 
	ctx.fill();
	
	ctx.beginPath();
	ctx.arc(0, -height, width/2, 0, 2 * Math.PI);
	ctx.fill();
	
	// temperature value
	if(ws != null)
		ctx.fillStyle="#ff1a1a";
	else
		ctx.fillStyle="Gray";
		
	ctx.beginPath();
	ctx.arc(0, 0, radius - offset, 0, 2 * Math.PI);
	ctx.fill();
	
	temp = Math.round(temp);
	var y = (height - radius)*temp/100.0 + radius + 5; 
	ctx.beginPath();
	ctx.rect(-width/2 + offset, -y, width - 2*offset, y); 
	ctx.fill();
	
	if(ws != null)
	{
		ctx.fillStyle="white";
		ctx.font="bold 34px Georgia";
		ctx.textBaseline="middle"; 
		ctx.textAlign="center";
		ctx.fillText(temp.toString() + "°C", 0, 0);
	}
}

window.onload = init;
</script>
</head>

<body>

<p>
<h1>Arduino - Web Thermometer</h1>
</p>

<canvas id="remote"></canvas>

<h2>
<p>
WebSocket : <span id="ws_state">null</span>
</p>
<button id="bt_connect" type="button" onclick="connect_onclick();">Connect</button>
</h2>

</body>
</html>

Schematics

Wiring between Arduino and Sensor
1. Stack PHPoC wifi shield or PHPoC shield on Arduino
2. Wiring like below image
Phpoc shield circuit 40 g4wa2rlkgi
Real connection
Arduino thing 3 4jqzsodqpe

Comments

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