Arduino-Android LED Control Using Ethernet Shield

Things you need:

hardware :

  Arduino Uno
  Ethernet Shield
  LED 2 pcs.
  Resistors 2pcs.
  Breadboard(optional)
  wires(copper,ethernet cable)
  Router

connect 

  LED 1 --> pin 6 to ground
  LED 2 --> pin 7 to ground
software:

  Eclipse IDE
  Arduino IDE 1.x.x

Step 1: Program Your Arduino

// A simple web server that always just says "Hello World"

#include "etherShield.h"
#include "ETHER_28J60.h"

int led2 = 7;
int led1 = 6;


static uint8_t mac[6] = {0xAA, 0xBB, 0xCC, 0xDD, 0xBB, 0xAA};   // this just needs to be unique for your network,
                                                                // so unless you have more than one of these boards
                                                                // connected, you should be fine with this value.

static uint8_t ip[4] = {192, 168, 0, 15};                       // the IP address for your board. Check your home hub
                                                                // to find an IP address not in use and pick that
                                                                // this or 10.0.0.15 are likely formats for an address
                                                                // that will work.
static uint16_t port = 80;                                      // Use port 80 - the standard for HTTP

ETHER_28J60 e;

void setup()
{
    e.setup(mac, ip, port);

    pinMode(led1, OUTPUT);
    pinMode(led2, OUTPUT);

    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);


}

void loop()
{
  char* params;
  if (params = e.serviceRequest())
  {
    if (strcmp(params, "?cmd=1") == 0)
    {
          digitalWrite(led1, HIGH);
    }
    if (strcmp(params, "?cmd=2") == 0)
    {
          digitalWrite(led1, LOW);

    }
    if (strcmp(params, "?cmd=3") == 0)
    {
          digitalWrite(led2, HIGH);
    }
    if (strcmp(params, "?cmd=4") == 0)
    {
          digitalWrite(led2, LOW);

    }

    e.respond();
  }
}

Step 2: Your App (main Activity)

package com.androidarduino;

import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

@Override
protected void onCreate(Bundle savedInstanceState) {

  StrictMode.ThreadPolicy policy = new StrictMode.
  ThreadPolicy.Builder().permitAll().build();
  StrictMode.setThreadPolicy(policy);

  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  View led1on = findViewById(R.id.led_1on);
  View led1off = findViewById(R.id.led_1off);
  View led2on = findViewById(R.id.led_2on);
  View led2off = findViewById(R.id.led_2off);

  led1on.setOnClickListener(this);
  led1off.setOnClickListener(this);
  led2on.setOnClickListener(this);
  led2off.setOnClickListener(this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
}

public void commandArduino(String url){
   try {
      HttpClient httpclient = new DefaultHttpClient();
      httpclient.execute(new HttpGet(url));      
    } catch (Exception e) {
    }
}

public void onClick(View thisView) {
  switch(thisView.getId()){
  case R.id.led_1on: 
   commandArduino("http://192.168.0.15/?cmd=1");
   Toast.makeText(getApplicationContext(), "led_1on",Toast.LENGTH_LONG).show();
   break;
  case R.id.led_1off: 
   commandArduino("http://192.168.0.15/?cmd=2");
   Toast.makeText(getApplicationContext(), "led_1off",Toast.LENGTH_LONG).show();
   break;
  case R.id.led_2on: 
   commandArduino("http://192.168.0.15/?cmd=3");
   Toast.makeText(getApplicationContext(), "led_2on",Toast.LENGTH_LONG).show();
   break;
  case R.id.led_2off: 
   commandArduino("http://192.168.0.15/?cmd=4");
   Toast.makeText(getApplicationContext(), "led_2off",Toast.LENGTH_LONG).show();
   break;

  }

}

}

Step 3: Write Your Xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Arduino Simple Automation"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/led_1on"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_weight="0.39"
            android:text="LED 1 ON" />

        <Button
            android:id="@+id/led_1off"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_weight="0.39"
            android:text="LED 1 OFF" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/linearLayout1"
        android:layout_alignRight="@+id/linearLayout1"
        android:layout_below="@+id/linearLayout1"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/led_2on"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_weight="0.39"
            android:text="LED 2 ON" />

        <Button
            android:id="@+id/led_2off"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_weight="0.39"
            android:text="LED 2 OFF" />
    </LinearLayout>

</RelativeLayout>

Step 4: Add Permission to Your Manifest

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />



your android manifest should look like these:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidarduino"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.androidarduino.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>