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Topic: Arduino Web Control (Read 31379 times) previous topic - next topic

Haavard GJ

Dec 22, 2010, 08:54 am Last Edit: Dec 22, 2010, 08:56 am by haavardgj Reason: 1
I wanted to make my home automated with ethernet control, so that i could turn on and off things in my house with either a phone or a pc.

so after spending almost three weeks of research, i found some code i could use. sadly the code didn't work in version 21, so i had to modify it slightly, to get it to work.

the code is based on the orginal ethernet shield (W/ Wiznet module)
and an Arduino duemilinove (2009). it will probably work on the UNO also =)

In the name of open source, i now share the code with you:

Code: [Select]

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

Simple Ethernet Test
Arduino server outputs simple text to browser
and controlling LED with simple checkbox

The circuit:
* Arduino Duemilanove
* Arduino Ethernet shield
* LED connected to GND and digital pin 4 via resistor
By Minde

*  Edited by Haavard GJ to work in version 0021              *
*  Thanks to PaulS for the big help on getting this to work  *

byte    mac[] =     { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };   //physical mac address
byte    ip[] =      { 192, 168, 2, 110 };                     // ip in lan
byte    gateway[] = { 192, 168, 2, 1 };                       // the IP of the router or acsesspoint
byte    subnet[] =  { 255, 255, 255, 0 };                     //subnet mask (i dont think this is neccesary
Server  server(80);                // server port (change this if you are having a local webserver else than the arduino)
int     ledPin = 4;                // LED pin
int     heatpin = 5;               // Heating *relay* (change this if you want)
int     sensorPin = A0;            // analog in 0 for testing
int     sensorValue = 0;           // integer for the analog sensor
String  readString = String(30);   // string for fetching data from address
boolean LEDON = false;             // LED status flag
boolean HEATON = false;             // Heat status flag  (add more status flags if you need more outputs)

void setup()
 Serial.begin(57600); //enable serial datada print
 Ethernet.begin(mac, ip, gateway, subnet); //start Ethernet
 pinMode(ledPin, OUTPUT); //Set pin 4 to output
 pinMode(heatpin, OUTPUT);
 Serial.print("Starting server"); //for debugging
 sensorValue = analogRead(sensorPin);
 Serial.println("Analog in:"); //for debugging
 Serial.println (sensorValue);


void loop(){

 Client client = server.available();  // Create a client connection
   if (client) {
     while (client.connected()) {
       if (client.available()) {

         char c = client.read();

       if (readString.length() < 30) { //read char by char HTTP request
         readString.concat(c); } //store characters to string
       Serial.print(c); //output chars to serial port for debugging


       if (c == '\n') { //if HTTP request has ended
         Serial.println(readString); // print for debugging
         int Le = readString.indexOf("L="); //here is a key component of where
         int He = readString.indexOf("H="); //the status is being read by the arduino
         Serial.print("L= position: ");
         Serial.print("H= position: ");
         //lets check if LED should be lighted
         if (Le > 1){
         if (readString.substring(Le,(Le+3)) == "L=1") { //led has to be turned ON
             digitalWrite(ledPin, HIGH); // set the LED on
             Serial.println("ledpin paa");
             LEDON = true;

         if (readString.substring(Le,(Le+3))== "L=0") {
           //led has to be turned OFF
           digitalWrite(ledPin, LOW); // set the LED OFF
           Serial.println("ledpin av");
           LEDON = false;
          if (He > 1){
         if (readString.substring(He,(He+3) == "H=1") { //heat has to be turned ON
             digitalWrite(heatpin, HIGH); // set the heat on
             Serial.println("heatpin paa");
             HEATON = true;

         if (readString.substring(He,(He+3) == "H=0") {
           //heat has to be turned OFF
           digitalWrite(heatpin, LOW); // set the heat OFF
           Serial.println("heatpin av");
           HEATON = false;

 client.println("HTTP/1.1 200 OK"); //output HTML data starting with standart header
 client.println("Content-Type: text/html");
 client.print  ("<body style=background-color:white>"); //set background to white

 // HTML Code

 client.println("<font color='red'><h1>Arduino Remote control</font></h1>");//send first heading
 client.println("<hr />");
 client.println("<font color='blue' size='5[ch8242]>Analog input: "); //output some sample data to browser
 sensorValue = analogRead(sensorPin);

 client.print(sensorValue);//Analog input.

 client.println("<br />");//some space between lines
 client.println("<br />");
 client.println("<hr />");

 //controlling led via checkbox
 client.println("<h1>LED control</h1>");

 // address will look like http://192.168.xxx.xxx/?L=1 when submited
 // this line will give the radiobuttons that give the input
 client.println("<form method=get name=LED> <input type='radio' name='L' value='1'>LED ON<br><input type='radio' name='L' value='0'>LED OFF<br><input type='radio' name='H' value='1'>HEAT ON<br><input type='radio' name='H' value='0'>HEAT OFF<br><input type=submit value=submit></form>");

 client.println("<br />");
 //printing LED status
 client.print("<font size='5[ch8242]>LED status: ");
 if (LEDON == true) {
    client.println("<font color='green' size='5[ch8242]>ON");
    Serial.print("led on");
  else {
   client.println("<font color='grey' size='5[ch8242]>OFF");
   Serial.println("Led off")

//printing LED status
 client.print("<font size='5[ch8242]>Heatpin status: ");
 if (HEATON == true) {
    client.println("<font color='green' size='5[ch8242]>ON");
    Serial.print("Heat on");
  else {
   client.println("<font color='grey' size='5[ch8242]>OFF");
   Serial.println("Heat off");

 client.println("<hr />");

readString=""; //clearing string for next read

client.stop(); //stopping client

Serial.println("stopped client"); // for debugging


just to have said it: the web page that is outputted looks crappy as hell, but if you can simple html you easily can change the look to something much better


Nice!  When my work project is finished, ethernet and home automation is where i wanna go next.


Dec 29, 2010, 03:34 pm Last Edit: Dec 29, 2010, 03:34 pm by jpmcg Reason: 1
 Nice job.  I have an ethershield I purchased on eBay.  I can control from "inside"my network from iPhone or wireless laptop.  I cannot find an easy "REAL DUMMIES(that's me  :))" guide to port forward the arduino to access from outside my network.  I can access the initial LED  page from the Arduino webserver, but when I try to change states from off to on, it says "cannot open page because the server stopped responding"  Any ideas?


if you have an android device you can go into this
nice work!

Haavard GJ

@JPMcG: you can try to see http://portforward.com/

it could be smart to add a password box to prewent others to control your arduino =)

the next version i'm working on, im going to add a password box so that none others can axcess my arduino  ;)


Thanks.  I've been to that site many times.  Downloaded their Port Forward Tool...no njoy.  I can get to it from my iPhone, or any other computer(wired or WiFi) that is on my network.  But still cannot get to it from 3G from outside my "cloud".  Thanks for the suggestions...I'll keep plinking away.

Haavard GJ

what type of router do you have? i have not tryed to reach it outside the network but it can be that you have a dynamic ip-adress. if you have dynamic, then you can go to http://www.dyndns.com/ and get a free account so you can still acsess the network even if the ip have changed


 Thanks for your help.  I have a Linksys WRT54G.  Tried the DYnamic DNS website.  Have a logon just need to look at the site some more to figure how to make it do what I want. I am wondering if maybe Port 80 is blocked by Comcast.  the sketch has the IP and Port defined, with the Port in the sketch set at 80.  When I try the IP of my Cable Moden with the Arduino disconnected...it sends me tro the LOGin page for my router.  Plugging teh Arduino in lets me control from within my network.  When I try from just 3G on iPhone I receive Server not responding error.

Haavard GJ

Maybe you shoud try to use some other port on your arduino... try to use for example 84 or something that is not used for the router instead, then it will not be an conflict with the port.

I think that may solve your problem.


try port 8000 i know the local cable company here blocks 80 so we have used 8000

another thing you may have to set up is the port forwarding on the router

Here is a neat little free program i use that will check to see if you have a port open and working (i think they also have a list of all the routers and what settings you need to change)

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