Android + Arduino蓝牙数据传输

时间:2012-04-26 05:02:47

标签: android bluetooth arduino

我可以通过蓝牙将我的Android应用程序连接到我的Arduino。但是,它们之间不能传输数据。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作为波特率,我尝试将蓝牙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(我可以看到这是因为flashLED()方法)。

Android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亮起然后熄灭,当我关闭连接时,红色指示灯闪烁。 sendData()方法不会抛出异常,否则showMessage(“SEND FAILED”);会出现。

我的清单.xml

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

非常感谢任何帮助!

代码取自:

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

7 个答案:

答案 0 :(得分:13)

刚刚解决了遇到此页面的其他人的问题。

似乎我的Arduino不喜欢使用数字引脚进行串行通信,我使用TX和RX而不是使用http://jondontdoit.blogspot.com.au/2011/11/bluetooth-mate-tutorial.html中的代码,似乎9600是一个很好的波特而不是115200。

/***********************
 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);
}

答案 1 :(得分:5)

我得到了同样的东西。我进入了“设置” - &gt;'无线和网络' - &gt;'蓝牙设置'并配对设备。当我回去重新运行我的代码时,它连接起来,也不例外。我在我的UI中放置控件以显示配对设备,我将看看是否可以编写代码来管理我的UI中的配对设备。

答案 2 :(得分:1)

我只有在替换此部分后才能运行它:

Set<BluetoothDevice> pairedDevices = BluetoothAdapter.getBondedDevices();
if(pairedDevices.size() > 0)
    {
        for(BluetoothDevice device : pairedDevices)
        {
            if(device.getName().startsWith("FireFly-"))
            {
                mmDevice = device;
                Log.d("ArduinoBT", "findBT found device named " + mmDevice.getName());
                Log.d("ArduinoBT", "device address is " + mmDevice.getAddress());
                break;
            }
        }
    }

用这个:

 Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
 mmDevice = mBluetoothAdapter.getRemoteDevice("00:06:66:46:5A:91");
 if (pairedDevices.contains(mmDevice))
    {
        statusText.setText("Bluetooth Device Found, address: " + mmDevice.getAddress() );
        Log.d("ArduinoBT", "BT is paired");
    }

我输入了蓝牙设备的地址。 原始代码找到设备并返回正确的地址,但是     mmSocket.connect(); 生成异常“java.io.IOException:Service discovery failed”

建议?

答案 3 :(得分:1)

对于找到此页面的人,但如上所述使用硬编码的mac地址卡住,请将mac地址设置为NULL,并将此代码插入OnResume()

try{
File f = new File(Environment.getExternalStorageDirectory()+"/mac.txt");
FileInputStream fileIS = new FileInputStream(f);
buf = new BufferedReader(new InputStreamReader(fileIS));
String readString = new String(); 
while((readString = buf.readLine())!= null){
address = readString;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e){
e.printStackTrace();
}

另外,不要忘记允许eclipse包含必要的库,并将你的mac地址放在SD卡根目录的mac.txt中,然后你可以简单地给用户一个带有mac地址的文本文件,同时仍然允许应用程序从市场下载而无需自定义每个实例。

答案 4 :(得分:1)

@Backwards_Dave只是为了好奇,尝试连接45和46引脚并使用这个简单的代码。我用它并没有问题。您将能够从Arduino串行监视器发送数据并在那里阅读。

/*
Pinout:
45 --> BT module Tx
46 --> BT module Rx
*/
#include <SoftwareSerial.h>

SoftwareSerial mySerial(45, 46); // RX, TX

void setup()  
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);


  Serial.println("I am ready to send some stuff!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
}

void loop() // run over and over
{
  if (mySerial.available())
    Serial.write(mySerial.read());
  if (Serial.available())
    mySerial.write(Serial.read());
}

另外,你为Arduino使用什么BlueTooth盾牌? HC-06?

修改

刚刚使用Mega2560进行了测试(没有1280),它没有问题。

我认为问题在于引脚。

等待您的反馈

答案 5 :(得分:1)

如果您仍在寻找答案,请尝试更改软件序列引脚。这是您正在使用的库的众所周知的限制。

并非所有Mega支架上的引脚都会改变中断,因此只有以下内容可用于RX:10,11,12,13,14,15,50,51,52,53,A8(62),A9( 63),A10(64),A11(65),A12(66),A13(67),A14(68),A15(69)。 Refs

希望这有帮助。

答案 6 :(得分:0)

我认为这可能是蓝牙的一些错误..重新安装其驱动程序更好..因为上面给出的代码看起来是正确的。