ผมทำ app ว่าจะส่ง string (แต่ตอนนี้ทดสอบส่งตัวอักษร)ทำไมมันไม่ขึ้น ใน Serial Monitor ใน Arduino ครับ ผมทำผิดตรงไหน ตัวอย่างส่ง T มา 1 ตัว

code Android
[open_code]
package app.teststring.app;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.example.roommanage.app.R;

import app.akexorcist.bluetoothspp.BluetoothSPP;
import app.akexorcist.bluetoothspp.BluetoothSPP.BluetoothConnectionListener;
import app.akexorcist.bluetoothspp.BluetoothSPP.OnDataReceivedListener;
import app.akexorcist.bluetoothspp.BluetoothState;
import app.akexorcist.bluetoothspp.DeviceList;

public class MainActivity extends ActionBarActivity {
    BluetoothSPP bt;
    BluetoothAdapter mBluetoothAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bt = new BluetoothSPP(this);

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if(mBluetoothAdapter == null) {
            Toast.makeText(getApplicationContext(), "No bluetooth adapter available"
                    , Toast.LENGTH_SHORT).show();
        }

        bt.setOnDataReceivedListener(new OnDataReceivedListener() {
            public void onDataReceived(byte[] data, String message) {
                Toast.makeText(getApplicationContext(), message
                        , Toast.LENGTH_SHORT).show();
            }
        });

        bt.setBluetoothConnectionListener(new BluetoothConnectionListener() {
            public void onDeviceConnected(String name, String address) {
                Toast.makeText(getApplicationContext()
                        , "Connected to " + name + "\n" + address
                        , Toast.LENGTH_SHORT).show();
            }

            public void onDeviceDisconnected() {
                Toast.makeText(getApplicationContext()
                        , "Connection lost", Toast.LENGTH_SHORT).show();
            }

            public void onDeviceConnectionFailed() {
                Toast.makeText(getApplicationContext()
                        , "Unable to connect", Toast.LENGTH_SHORT).show();
            }
        });

        Button btnConnect = (Button)findViewById(R.id.btnConnect);
        btnConnect.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v){
                if(bt.getServiceState() == BluetoothState.STATE_CONNECTED) {
                    bt.disconnect();// แก้จาก bt.disconnected()
                } else {
                    Intent intent = new Intent(getApplicationContext()
                            , DeviceList.class);
                    startActivityForResult(intent
                            , BluetoothState.REQUEST_CONNECT_DEVICE);
                }
            }
        });
    }

    public void onDestroy() {
        super.onDestroy();
        bt.stopService();
    }

    public void onStart() {
        super.onStart();
        if (!bt.isBluetoothEnabled()) {
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(intent, BluetoothState.REQUEST_ENABLE_BT);
        } else {
            if (!bt.isServiceAvailable()) {
                bt.setupService();
                bt.startService(BluetoothState.DEVICE_OTHER);
                setup();
            }
        }
     }

    public void setup() {
        Button btnSubmit = (Button)findViewById(R.id.btnSubmit);
        btnSubmit.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
               bt.send("T");
            }
        });
        bt.autoConnect("HC-05");
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == BluetoothState.REQUEST_CONNECT_DEVICE) {
            if(resultCode == Activity.RESULT_OK)
                bt.connect(data);
        } else if(requestCode == BluetoothState.REQUEST_ENABLE_BT) {
            if(resultCode == Activity.RESULT_OK) {
                bt.setupService();
                bt.startService(BluetoothState.DEVICE_OTHER);
                setup();
            } else {
                Toast.makeText(getApplicationContext() ,
                        "Bluetooth was not enabled."
                        , Toast.LENGTH_SHORT).show();
                finish();
            }
        }
    }
}

[/close_code]

code Arduino
[open_code]
#include <SoftwareSerial.h>

int bluetoothTx = 2;
int bluetoothRx = 3;

SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);

String inputString = "";         // a string to hold incoming data
boolean stringComplete = false;  // whether the string is complete

void setup()
{
  pinMode(bluetoothTx,INPUT);
  pinMode(bluetoothRx,OUTPUT);
  
  //Setup usb serial connection to computer
  Serial.begin(9600);// Begin the serial monitor at 9600bps
  
  //Setup Bluetooth serial connection to android
  bluetooth.begin(115200);// The Bluetooth Mate defaults to 115200bps
  bluetooth.print("$$$"); // Print three times individually //ต้นฉบับ print 3 คำสั่ง แยกที่ละตัว
  delay(100);// Short delay, wait for the Mate to send back CMD
  bluetooth.println("U,9600,N");// Temporarily Change the baudrate to 9600, no parity
  // 115200 can be too fast at times for NewSoftSerial to relay the data reliably
  bluetooth.begin(9600);// Start bluetooth serial at 9600
  
  inputString.reserve(200);
}

void loop()
{
  // print the string when a newline arrives:
  if (stringComplete) {
    Serial.println(inputString);
    // clear the string:
    inputString = "";
    stringComplete = false;
  }  
}

void serialEvent() {
//  while (Serial.available()) {
  while (bluetooth.available()) {
    // get the new byte:    
    char inChar = (char)bluetooth.read();
    // add it to the inputString:
    inputString += inChar;
    // if the incoming character is a newline, set a flag
    // so the main loop can do something about it:
    if ((inChar == '\r') ||(inChar == '\n')) {
      stringComplete = true;
    }
  }
}
[/close_code]

ใน Serial Monitor ผมปรับให้เป็น Newline ด้วยนะ