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Topic: home automation with arduino and android (Read 77632 times) previous topic - next topic


Adam Green

Nice! Been looking into home automation for ages this seems perfect! Sorry if im just being blind but is there the script for the arduino up? I have the app on my phone already and will order the parts and arduino UNO tomorrow.


you can find an example of arduino sketch at the first page of this post, let me know

Adam Green

Hi got my uno today, all connected up have it conected to the network. I put the scetch you posted on the first page and i get the error on the line


'class string' has no member named 'append'

any ideas?




Which version of the IDE are you using? Take a look on this


Looms really good!
What code did you use for the computer interface?
I'd love to build something like this, but I would have
no idea how to intergrate it into the computer.
My website: http://www.harryrabbit.co.uk/electronics/home.html Up and running now! (Feel free to look round!) :D


the interface has been developed for android device, so it has been build in JAVA, full code is available on github

Adam Green

Dec 06, 2010, 09:41 pm Last Edit: Dec 06, 2010, 09:43 pm by adamjgreen Reason: 1
Thanks got rid of the error but now means the wont sync with my android  :-/

I guess ill have to start writing from scratch then...

Thanks Adam


before to use the android app test the http call through a web browser...you should see the json message on it

Adam Green

Thanks mate.

Im finding it really hard to see whats what in the script so i might have to have a go at starting from scratch....


of course, some basic programming skills are needed to better understand it, let me know!


Hi there, with this sample you should be able to turn on/off a light, i'm posting this beacuse an user of this forum asked me how to make it and i thought it was nice sharing this with all the people.
Code: [Select]

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

#define action_none -1
#define action_out_all 0
#define action_on_light 1
#define action_off_light 2

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xBE }; //physical mac address
byte ip[] = { 192, 168, 1, 16 };                  // ip address
byte gateway[] = { 192, 168, 1, 1 };                  // internet access via router
byte subnet[] = { 255, 255, 255, 0 };                   //subnet mask
Server server(80);                                      //server port
String readString = String(30); //string for fetching data from address

// arduino out
int pinOutPlight = 4;

// incoming GET command  
String r_pinOnLight = "GET /?out=4&status=1";
String r_pinOffLight = "GET /?out=4&status=0";
String r_out_all = "GET /?out=all";

// current action
int current_action;

void setup(){
 //start Ethernet
 Ethernet.begin(mac, ip, gateway, subnet);

 pinMode(pinOutPlight, OUTPUT);    
 digitalWrite(pinOutPlight, LOW);
 //enable serial datada print  
 current_action = -1;
void loop(){
 current_action = -1;

 // Create a client connection
 Client client = server.available();
   if (client) {
     while (client.connected()) {
      if (client.available()) {
       char c = client.read();
       //read char by char HTTP request
       if (readString.length() < 30)
         //store characters to string
         readString = readString + c;
       //output chars to serial port
       //if HTTP request has ended
       if (c == '\n') {

        // ****************************************************
         Serial.print("\n ON UP \n");
         current_action = action_on_light;
         else if(readString.startsWith(r_pinOffLight))
          Serial.print("\n OFF UP \n");
          current_action = action_off_light;              
         else if(readString.startsWith(r_out_all))
           Serial.print("\n ALL\n");
           current_action = action_out_all;
           Serial.print("\n None \n");  
           current_action = action_none;
        // ****************************************************  
         // now output HTML data starting with standart header
         client.println("HTTP/1.1 200 OK");
         client.println("Content-Type: text/html");
        char buf[12];              
        case action_out_all:
           client.print("{\"ip\" : \"\", \"devices\" : [{ \"type\" : \"light\", \"name\" : \"your name\", \"out\" : \"");          
        case action_on_light:
          digitalWrite(pinOutPlight, HIGH);
          client.print("{\"status\" : \"1\" , \"out\" : \"");
        case action_off_light:
          digitalWrite(pinOutPlight, LOW);
          client.print("{\"status\" : \"0\" , \"out\" : \"");
          current_action = action_none;        

        // ****************************************************            

         //clearing string for next read
         //stopping client

you have to change your ip in the sketch. It's just a demo, any improvement are welcome.


If someone has downloaded my app and played a bit with arduino and this stuff you should vote my project on MAKE



Andy R

This post started out with the premise that other home automation systems are too expensive. Aren't X10 systems pretty cheap ($99 for controller and software)?

One issue with X10 is that they require a computer with X10 controller on 24/7. The computer provides a web interface and can turn devices on/off at scheduled times. For example, you may want to switch an outside light on automatically at 7 PM every day.

Have you given any thought to a server solution, i.e. leaving an android device at home and on 24/7 that can be connected to remotely?


Dec 27, 2010, 10:54 pm Last Edit: Dec 28, 2010, 12:21 am by Fluke Reason: 1

I try to get this to work with the 28J60 Ethernet Shield.

But i get error in the android APP "An error has accoured, check your internet connection. Is Arduino Alive?"
It all works, i get "my item" and i can controll the arduino output from the app.
The only problem seems to be with the JSON from the arduino to the android app. When i test in my web browser its look like this:
Code: [Select]
-> {"status" : "0" , "out" : "5"}
-> {"status" : "1" , "out" : "5"}

What can be wrong?

Code: [Select]
if (strcmp(params, "?out=all") == 0)
          e.print("{\"ip\" : \"\", \"devices\" : [{ \"type\" : \"plug\", \"name\" : \"LAMPA\", \"out\" : \"");          

if (strcmp(params, "?out=5&status=0") == 0)
          digitalWrite(pinOutRelay, LOW);
            Serial.println("OUT LOW!!");
           e.print("{\"status\" : \"0\" , \"out\" : \"");

if (strcmp(params, "?out=5&status=1") == 0)
          digitalWrite(pinOutRelay, HIGH);
          Serial.println("OUT HIGH!!");
          e.print("{\"status\" : \"1\" , \"out\" : \"");

Edit: I found the error :)
I had a old DomoticHome APP installed . It work perfect  with the app from market.

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