Arduino Webserver – code

Arduino Sketch:

/*————————————————————–
Program:      two_temperatures

Description:  Arduino web server web page displays two
temperature values on two gauges.
The web page is stored on the SD card.
Ajax is used to update the analog values on the
web page.

Hardware:     Arduino Uno and official Arduino Ethernet
shield. Should work with other Arduinos and
compatible Ethernet shields.
2Gb micro SD card formatted FAT16.
MCP9700 temperature sensors interfaced to
A2 & A3 analog inputs.

Software:     Developed using Arduino 1.0.5 software
Should be compatible with Arduino 1.0 +
SD card contains web page called index.htm

References:   – WebServer example by David A. Mellis and
modified by Tom Igoe
– SD card examples by David A. Mellis and
Tom Igoe
– Ethernet library documentation:
http://arduino.cc/en/Reference/Ethernet
– SD Card library documentation:
http://arduino.cc/en/Reference/SD
– Gauge from:
https://github.com/Mikhus/canv-gauge

Date:         3 August 2014

Author:       W.A. Smith, http://startingelectronics.org
————————————————————–*/

#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>

// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ   50

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 20); // IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80
File webFile;               // the web page file on the SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0;              // index into HTTP_req buffer

void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);

Serial.begin(9600);       // for debugging

// initialize SD card
Serial.println(“Initializing SD card…”);
if (!SD.begin(4)) {
Serial.println(“ERROR – SD card initialization failed!”);
return;    // init failed
}
Serial.println(“SUCCESS – SD card initialized.”);
// check for index.htm file
if (!SD.exists(“index.htm”)) {
Serial.println(“ERROR – Can’t find index.htm file!”);
return;  // can’t find index file
}
Serial.println(“SUCCESS – Found index.htm file.”);

Ethernet.begin(mac, ip);  // initialize Ethernet device
server.begin();           // start to listen for clients
}

void loop()
{
EthernetClient client = server.available();  // try to get client

if (client) {  // got client?
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {   // client data available to read
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ – 1)
if (req_index < (REQ_BUF_SZ – 1)) {
HTTP_req[req_index] = c;          // save HTTP request character
req_index++;
}
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == ‘\n’ && currentLineIsBlank) {
// send a standard http response header
client.println(“HTTP/1.1 200 OK”);
// remainder of header follows below, depending on if
// web page or XML page is requested
// Ajax request – send XML file
if (StrContains(HTTP_req, “ajax_inputs”)) {
// send rest of HTTP header
client.println(“Content-Type: text/xml”);
client.println(“Connection: keep-alive”);
client.println();
// send XML file containing input states
XML_response(client);
}
else {  // web page request
// send rest of HTTP header
client.println(“Content-Type: text/html”);
client.println(“Connection: keep-alive”);
client.println();
// send web page
webFile = SD.open(“index.htm”);        // open web page file
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
}
// display received HTTP request on serial port
Serial.print(HTTP_req);
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == ‘\n’) {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != ‘\r’) {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1);      // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}

// send the XML file containing analog value
void XML_response(EthernetClient cl)
{
int analog_val_1 = 0;
int analog_val_2 = 0;
char sample;

// get the sum of 10 samples from analog inputs 2 and 3
for (sample = 0; sample < 10; sample++) {
analog_val_1 += analogRead(2);
delay(2);
analog_val_2 += analogRead(3);
delay(2);
}
// calculate the average of the 10 samples
analog_val_1 /= 10;
analog_val_2 /= 10;

cl.print(“<?xml version = \”1.0\” ?>”);
cl.print(“<inputs>”);
// read analog pin A2
//    analog_val = analogRead(2);
cl.print(“<analog>”);
cl.print(analog_val_1);
cl.print(“</analog>”);
//    analog_val = analogRead(3);
cl.print(“<analog>”);
cl.print(analog_val_2);
cl.print(“</analog>”);
cl.print(“</inputs>”);
}

// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}

// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;

len = strlen(str);

if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}

return 0;
}

SD Card Hosted Web Page

HTML Page: (gauge.html)

<!DOCTYPE html>
<html>
<head>
<title>Arduino Two Temperatures</title>
<script type=”text/javascript” src=”AnalogueData.js”></script>
</head>
<body onload=”GetMicoControllerInputs()”>
<h1>Arduino Two Temperatures</h1>
<table border=”1″>
<tr><td>
<canvas id=”an_gauge_1″
data-title=”Inside”
data-units=”Temp. &deg;C”
width=”500″ height=”500″
data-major-ticks=”-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160″
data-type=”canv-gauge”
data-min-value=”-40″
data-max-value=”160″
data-highlights=”-40 0 #4D89F2, 0 10 #25B8D9, 10 30 #0BB950, 30 40 #cc5, 40 160 #f33″
data-onready=”setInterval( function() { Gauge.Collection.get(‘an_gauge_1’).setValue(data_val);
}, 200);”></canvas>
</td></tr>
<tr><td>
<canvas id=”an_gauge_2″
data-title=”Outside”
data-units=”Temp. &deg;C”
width=”500″ height=”500″
data-major-ticks=”-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150″
data-type=”canv-gauge”
data-min-value=”-40″
data-max-value=”150″   data-highlights=”-40 0 #4D89F2, 0 10 #25B8D9, 10 30 #0BB950, 30 40 #cc5, 40 150 #f33″
data-onready=”setInterval( function() { Gauge.Collection.get(‘an_gauge_2’).setValue(data_val2)
;}, 200);”></canvas>
</td></tr>
</table>
</body>
</html>

JavaScript Page: (AnalogueData.js)

        var data_val = 0;
var data_val2 = 0;
<!– Gauge Code Starts –>
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function L(){a.save();a.font=40*(f/200)+”px Led”;var b=x(y),h=a.measureText(“-“+x(0)).width,c=f-33*(f/100),g=0.12*f;a.save();var d=-h/2-0.025*f,e=c-g-0.04*f,h=h+0.05*f,g=g+0.07*f,k=0.025*f;a.beginPath();a.moveTo(d+k,e);a.lineTo(d+h-k,e);a.quadraticCurveTo(d+h,e,d+h,e+k);a.lineTo(d+h,e+g-k);a.quadraticCurveTo(d+h,e+g,d+h-k,e+g);a.lineTo(d+k,e+g);a.quadraticCurveTo(d,e+g,d,e+g-k);a.lineTo(d,e+k);a.quadraticCurveTo(d,e,d+k,e);a.closePath();d=a.createRadialGradient(0,c-0.12*f-0.025*f+(0.12*f+0.045*f)/
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maxValue:100,minValue:0,majorTicks:[],minorTicks:10,strokeTicks:!0,units:!1,valueFormat:{“int”:3,dec:2},majorTicksFormat:{“int”:1,dec:0},glow:!0,animation:{delay:10,duration:250,fn:”cycle”},colors:{plate:”#fff”,majorTicks:”#444″,minorTicks:”#666″,title:”#888″,units:”#888″,numbers:”#444″,needle:{start:”rgba(240, 128, 128, 1)”,end:”rgba(255, 160, 122, .9)”}},highlights:[{from:20,to:60,color:”#eee”},{from:60,to:80,color:”#ccc”},{from:80,to:100,color:”#999″}]};var y=0,E=this,n=0,I=0,H=!1;this.setValue=
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y=b.minValue;if(!b.renderTo)throw Error(“Canvas element was not specified when creating the Gauge object!”);var z=b.renderTo.tagName?b.renderTo:document.getElementById(b.renderTo),a=z.getContext(“2d”),A,C,D,t,u,f,B;q();this.updateConfig=function(a){l(this.config,a);q();this.draw();return this};var M={linear:function(a){return a},quad:function(a){return Math.pow(a,2)},quint:function(a){return Math.pow(a,5)},cycle:function(a){return 1-Math.sin(Math.acos(a))},bounce:function(a){a:{a=1-a;for(var b=0,
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(function(){var b=document,l=b.getElementsByTagName(“head”)[0],q=-1!=navigator.userAgent.toLocaleLowerCase().indexOf(“msie”),v=”@font-face {font-family: ‘Led’;src: url(‘fonts/digital-7-mono.”+(q?”eot”:”ttf”)+”‘);}”,k=b.createElement(“style”);k.type=”text/css”;if(q)l.appendChild(k),l=k.styleSheet,l.cssText=v;else{try{k.appendChild(b.createTextNode(v))}catch(e){k.cssText=v}l.appendChild(k);l=k.styleSheet?k.styleSheet:k.sheet||b.styleSheets[b.styleSheets.length-1]}var g=setInterval(function(){if(b.body){clearInterval(g);
var e=b.createElement(“div”);e.style.fontFamily=”Led”;e.style.position=”absolute”;e.style.height=e.style.width=0;e.style.overflow=”hidden”;e.innerHTML=”.”;b.body.appendChild(e);setTimeout(function(){Gauge.initialized=!0;e.parentNode.removeChild(e)},250)}},1)})();Gauge.Collection=[];
Gauge.Collection.get=function(b){if(“string”==typeof b)for(var l=0,q=this.length;l<q;l++){if((this[l].config.renderTo.tagName?this[l].config.renderTo:document.getElementById(this[l].config.renderTo)).getAttribute(“id”)==b)return this[l]}else return”number”==typeof b?this[b]:null};function domReady(b){window.addEventListener?window.addEventListener(“DOMContentLoaded”,b,!1):window.attachEvent(“onload”,b)}
domReady(function(){function b(b){for(var e=b[0],d=1,g=b.length;d<g;d++)e+=b[d].substr(0,1).toUpperCase()+b[d].substr(1,b[d].length-1);return e}for(var l=document.getElementsByTagName(“canvas”),q=0,v=l.length;q<v;q++)if(“canv-gauge”==l[q].getAttribute(“data-type”)){var k=l[q],e={},g,p=parseInt(k.getAttribute(“width”),10),w=parseInt(k.getAttribute(“height”),10);e.renderTo=k;p&&(e.width=p);w&&(e.height=w);p=0;for(w=k.attributes.length;p<w;p++)if(g=k.attributes.item(p).nodeName,”data-type”!=g&&”data-“==
g.substr(0,5)){var d=g.substr(5,g.length-5).toLowerCase().split(“-“);if(g=k.getAttribute(g))switch(d[0]){case “colors”:d[1]&&(e.colors||(e.colors={}),”needle”==d[1]?(d=g.split(/\s+/),e.colors.needle=d[0]&&d[1]?{start:d[0],end:d[1]}:g):(d.shift(),e.colors[b(d)]=g));break;case “highlights”:e.highlights||(e.highlights=[]);g=g.match(/(?:(?:-?\d*\.)?(-?\d+){1,2} ){2}(?:(?:#|0x)?(?:[0-9A-F|a-f]){3,8}|rgba?\(.*?\))/g);for(var d=0,J=g.length;d<J;d++){var s=g[d].replace(/^\s+|\s+$/g,””).split(/\s+/),x={};
s[0]&&””!=s[0]&&(x.from=s[0]);s[1]&&””!=s[1]&&(x.to=s[1]);s[2]&&””!=s[2]&&(x.color=s[2]);e.highlights.push(x)}break;case “animation”:d[1]&&(e.animation||(e.animation={}),”fn”==d[1]&&/^\s*function\s*\(/.test(g)&&(g=eval(“(“+g+”)”)),e.animation[d[1]]=g);break;default:d=b(d);if(“onready”==d)continue;if(“majorTicks”==d)g=g.split(/\s+/);else if(“strokeTicks”==d||”glow”==d)g=”true”==g?!0:!1;else if(“valueFormat”==d)if(g=g.split(“.”),2==g.length)g={“int”:parseInt(g[0],10),dec:parseInt(g[1],10)};else continue;
e[d]=g}}e=new Gauge(e);k.getAttribute(“data-value”)&&e.setRawValue(parseFloat(k.getAttribute(“data-value”)));k.getAttribute(“data-onready”)&&(e.onready=function(){eval(this.config.renderTo.getAttribute(“data-onready”))});e.draw()}});window.Gauge=Gauge;
<!– Gauge Code Ends –>

function GetMicoControllerInputs()
{
nocache = “&nocache=” + Math.random() * 1000000;
var request = new XMLHttpRequest();
request.onreadystatechange = function()
{
if (this.readyState == 4) {
if (this.status == 200) {
if (this.responseXML != null) {
data_val  = this.responseXML.getElementsByTagName(‘analog’)[0].childNodes[0].nodeValue;
data_val2 = this.responseXML.getElementsByTagName(‘analog’)[1].childNodes[0].nodeValue;
data_val  = ((data_val * 5.0 / 1024.0) – 0.5) / 0.01;
data_val2 = ((data_val2 * 5.0 / 1024.0) – 0.5) / 0.01;
}
}
}
}
request.open(“GET”, “ajax_inputs” + nocache, true);
request.send(null);
setTimeout(‘GetMicoControllerInputs()’, 200);

}

 

Content above has been modified

Original source of these content:

https://startingelectronics.org/projects/arduino-projects/web-server-two-temperature-gauges/

Another great blog on this topic:

http://www.tweaking4all.com/hardware/arduino/arduino-ethernet-data-push/

Momi.rt@gmail.com

momi.rt@gmail.com

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