[Help]How the data transfer via bluetooth from Arduino with android?

Projects Interfacing w/ Software on the Computer
1

Hi!
I'm learning about a project data transfer between android and arduino uno via bluetooth. I have found on the net but could not find. Can you help me?
Thanks.

2

Do you have a problem at the Android end (which I am unlikely to be able to help with) or at the Arduino end.

Without seeing your code it is impossible to offer any advice.

...R

3

can you give me some pieces of the project ?

4

Here is a sample project that I found.
If you want to receive data from the Arduino sent to the need to add anything?

/**

*/

package com.example.bluetooth1;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;

import com.example.bluetooth1.R;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";

Button btnOn, btnOff;
TextView tvShow;
int x;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;

// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

// MAC-address of Bluetooth module (you must edit this line)
private static String address = "30:14:06:16:06:59";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btnOn = (Button) findViewById(R.id.btnOn);
btnOff = (Button) findViewById(R.id.btnOff);
tvShow = (TextView) findViewById(R.id.tvShow);
x=0;
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();

btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("1");
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});

btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("0");
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
}

private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}

@Override
public void onResume() {
super.onResume();

Log.d(TAG, "...onResume - try connect...");

// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);

// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.

try {
btSocket = createBluetoothSocket(device);
} catch (IOException e1) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
}

/try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
}/

// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();

// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "...Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}

// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");

try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
}

@Override
public void onPause() {
super.onPause();

Log.d(TAG, "...In onPause()...");

if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}

try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}

private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}

private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}

private void sendData(String message) {
byte[] msgBuffer = message.getBytes();

Log.d(TAG, "...Send data: " + message + "...");

try {
outStream.write(msgBuffer);
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";

errorExit("Fatal Error", msg);
}
}
public boolean Bluetooth1(View v,MotionEvent event)
{
tvShow.setText("1 "+Integer.toString(x));
return true;

}
}

5

Wow.....

(You might be on the wrong forum)

6

sorry, I do not know
you can tell me where to enter.

7

ltdat5169:
Here is a sample project that I found.
If you want to receive data from the Arduino sent to the need to add anything?

/**

*/

package com.example.bluetooth1;

import java.io.IOException;

That is an Android java program.

This is an Arduino forum - don't expect Android expertise here. Especially as the Android people have gone out of their way to make Android programming as complicated as possible.

...R

8

ltdat5169:
where to enter.

Where to enter what?

You need to explain what you are asking in a lot more detail.

...R

9

I want to read ADC from Arduino then returns the smart phone via bluetooth.

10

ltdat5169:
I want to read ADC from Arduino then returns the smart phone via bluetooth.

You need

  • an Arduino program (which should be fairly easy to do)
  • a bluetooth module to connect to your Arduino
  • a program for your Android phone which can receive the data

Have you any of these parts?
If you have give details of them - but remember we don't know Android coding in this Forum

If you need to write a simple program for your phone this link to SL4A may be of interest

...R

11

I suspect you are trying to re-invent the wheel.

At a guess, you want to read an analogue signal on Arduino and send that to Android via Bluetooth.

This requires

  • an Arduino programme about ten lines long.
  • a bluetooth module for Arduino, cost about $7 on eBay
  • an app already written by somebody else for Android, of which there are about a dozen available, all for free.

My favourite is Bluetooth Graphics Terminal, which, surprise, can display your results live on a graph.