Android + Arduino 蓝牙数据传输

Question

我可以让我的 Android 应用通过蓝牙连接到我的 Arduino。但是，它们之间不能传输任何数据。以下是我的设置和代码:

HTC Android v2.2，蓝牙伴侣黄金调制解调器，Arduino Mega (ATmega1280)

Android Java 代码:

package com.example.BluetoothExample;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.TextView;
import android.widget.EditText;  
import android.widget.Button;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;

public class BluetoothExampleActivity extends Activity {
  TextView myLabel;
  EditText myTextbox;
  BluetoothAdapter mBluetoothAdapter;
  BluetoothSocket mmSocket;
  BluetoothDevice mmDevice;
  OutputStream mmOutputStream;
  InputStream mmInputStream;
  Thread workerThread;
  byte[] readBuffer;
  int readBufferPosition;
  int counter;
  volatile boolean stopWorker;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button openButton = (Button)findViewById(R.id.open);
    Button sendButton = (Button)findViewById(R.id.send);
    Button closeButton = (Button)findViewById(R.id.close);
    myLabel = (TextView)findViewById(R.id.label);
    myTextbox = (EditText)findViewById(R.id.entry);

    //Open Button
    openButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        try {
          findBT();
          openBT();
        }
        catch (IOException ex) { }
      }
    });

    //Send Button
    sendButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        try {
          sendData();
        }
        catch (IOException ex) {
            showMessage("SEND FAILED");
        }
      }
    });

    //Close button
    closeButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        try {
          closeBT();
        }
        catch (IOException ex) { }
      }
    });
  }

  void findBT() {
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if(mBluetoothAdapter == null) {
      myLabel.setText("No bluetooth adapter available");
    }

    if(!mBluetoothAdapter.isEnabled()) {
      Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
      startActivityForResult(enableBluetooth, 0);
    }

    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
    if(pairedDevices.size() > 0) {
      for(BluetoothDevice device : pairedDevices) {
        if(device.getName().equals("FireFly-108B")) {
          mmDevice = device;
          break;
        }
      }
    }
    myLabel.setText("Bluetooth Device Found");
  }

  void openBT() throws IOException {
    UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standard //SerialPortService ID
    mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);    
    mmSocket.connect();
    mmOutputStream = mmSocket.getOutputStream();
    mmInputStream = mmSocket.getInputStream();
    beginListenForData();
    myLabel.setText("Bluetooth Opened");
  }

  void beginListenForData() {
    final Handler handler = new Handler(); 
    final byte delimiter = 10; //This is the ASCII code for a newline character

    stopWorker = false;
    readBufferPosition = 0;
    readBuffer = new byte[1024];
    workerThread = new Thread(new Runnable() {
      public void run() {
         while(!Thread.currentThread().isInterrupted() && !stopWorker) {
          try {
            int bytesAvailable = mmInputStream.available();            
            if(bytesAvailable > 0) {
              byte[] packetBytes = new byte[bytesAvailable];
              mmInputStream.read(packetBytes);
              for(int i=0;i<bytesAvailable;i++) {
                byte b = packetBytes[i];
                if(b == delimiter) {
                  byte[] encodedBytes = new byte[readBufferPosition];
                  System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
                  final String data = new String(encodedBytes, "US-ASCII");
                  readBufferPosition = 0;

                  handler.post(new Runnable() {
                    public void run() {
                      myLabel.setText(data);
                    }
                  });
                }
                else {
                  readBuffer[readBufferPosition++] = b;
                }
              }
            }
          } 
          catch (IOException ex) {
            stopWorker = true;
          }
         }
      }
    });

    workerThread.start();
  }

  void sendData() throws IOException {
    String msg = myTextbox.getText().toString();
    msg += "\n";
    //mmOutputStream.write(msg.getBytes());
    mmOutputStream.write('A');
    myLabel.setText("Data Sent");
  }

  void closeBT() throws IOException {
    stopWorker = true;
    mmOutputStream.close();
    mmInputStream.close();
    mmSocket.close();
    myLabel.setText("Bluetooth Closed");
  }

  private void showMessage(String theMsg) {
        Toast msg = Toast.makeText(getBaseContext(),
                theMsg, (Toast.LENGTH_LONG)/160);
        msg.show();
    }
}

---

Arduino 代码:

#include <SoftwareSerial.h>

int bluetoothTx = 45;
int bluetoothRx = 47;

SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);

void setup() {
  //pinMode(45, OUTPUT);
  //pinMode(47, INPUT);
  pinMode(53, OUTPUT);
  //Setup usb serial connection to computer
  Serial.begin(9600);

  //Setup Bluetooth serial connection to android
  bluetooth.begin(115200);
  bluetooth.print("$$$");
  delay(100);
  bluetooth.println("U,9600,N");
  bluetooth.begin(9600);
}

void loop() {
  //Read from bluetooth and write to usb serial
  if(bluetooth.available()) {
  char toSend = (char)bluetooth.read();
  Serial.print(toSend);
  flashLED();
  }

  //Read from usb serial to bluetooth
  if(Serial.available()) {
  char toSend = (char)Serial.read();
  bluetooth.print(toSend);
  flashLED();
  }
}

void flashLED() {
  digitalWrite(53, HIGH);
  delay(500);
  digitalWrite(53, LOW);
}

我尝试使用 115200 和 9600 的波特率，并尝试将蓝牙 rx 和 tx 引脚设置为输入/输出和输出/输入。 Arduino 正在从 PC 接收串行数据，但无法将其发送到 Android(由于 flashLED() 方法，我可以看到这一点)。

Android 根本无法向 Arduino 发送任何数据。但是它们都已连接，因为调制解调器上的绿灯会打开并熄灭，并且当我关闭连接时红色 LED 会闪烁。 sendData() 方法不会抛出异常，否则 showMessage("SEND FAILED");会出现。

我的 list .xml 中也有这个

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="8" />

任何帮助将不胜感激!

代码取自:

http://bellcode.wordpress.com/2012/01/02/android-and-arduino-bluetooth-communication/

Answer 1

刚刚为遇到此页面的其他人解决了问题。

似乎我的 Arduino 不喜欢我使用数字引脚进行串行通信，我使用 TX 和 RX 代替此代码取自 http://jondontdoit.blogspot.com.au/2011/11/bluetooth-mate-tutorial.html ，似乎 9600 的波特率比 115200 好。

/***********************
 Bluetooth test program
***********************/
//TODO
//TEST THIS PROGRAM WITH ANDROID,
//CHANGE PINS TO RX AND TX THO ON THE ARDUINO!
//int counter = 0;
int incomingByte;

void setup() {
  pinMode(53, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // see if there's incoming serial data:
  if (Serial.available() > 0) {
    // read the oldest byte in the serial buffer:
    incomingByte = Serial.read();
    // if it's a capital R, reset the counter
    if (incomingByte == 'g') {
      digitalWrite(53, HIGH);
      delay(500);
      digitalWrite(53, LOW);
      delay(500);
      //Serial.println("RESET");
      //counter=0;
    }
  }

  //Serial.println(counter);
  //counter++;

  //delay(250);
}