I'm using Android to toggle my led light with Arduino and ethernet shield. It didn't work despite having no problems during compilation neither on Android nor Arduino. I connected the ethernet shield with my computer and I gave it the same address as my computer.
This is my Android code:
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.ToggleButton;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/********************************/
/* Define all the buttons */
/********************************/
Switch led1 = (Switch) findViewById(R.id.Led1);
/*******************************************************/
/* Set an onclick/onchange listener for every button */
/*******************************************************/
led1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
/* Switch is led 1 */
new Background_get().execute("led1=1");
} else {
new Background_get().execute("led1=0");
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/*****************************************************/
/* This is a background process for connecting */
/* to the arduino server and sending */
/* the GET request withe the added data */
/*****************************************************/
private class Background_get extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
try {
/* Change the IP to the IP you set in the arduino sketch */
URL url = new URL("http://169, 254, 128, 184/?" + params[0]);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
StringBuilder result = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
result.append(inputLine).append("\n");
in.close();
connection.disconnect();
return result.toString();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
}
And this is the Arduino code:
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(169, 254, 128, 184);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
// Pin 5
pinMode(5, OUTPUT);
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
String buffer = "";
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
buffer += c;
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close");
// the connection will be closed after completion of the response
client.println("Refresh: 5");
// refresh the page automatically every 5 sec
client.println();
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
buffer = "";
} else if (c != '\r') {
if (buffer.indexOf("GET /?led1=1") >= 0) { // If led1 = 1
digitalWrite(5, HIGH); // led 1 > on
}
if (buffer.indexOf("GET /?led1=0") >= 0) { // If led1 = 0
digitalWrite(5, LOW); // led 1 > off
}
} else {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
