接收來自Arduino的藍牙設備

Question

數據我按照這個例子：http://english.cxem.net/arduino/arduino5.php

我有一個Arduino的UNO板設置與sparkfun藍牙設備。我可以連接並從android發送數據到arduino，並且我可以在串口監視器中看到這些數據，但我無法從arduino（串口監視器）發送數據並返回到Android。

我正在使用在活動中的onResume方法中啓動的ConnectThread。這是我的線程代碼：

private class ConnectedThread extends Thread { 
     private final BluetoothSocket mmSocket; 
     private final InputStream mmInStream; 
     private final OutputStream mmOutStream; 

     public ConnectedThread(BluetoothSocket socket) { 
      Log.d("THREAD", "constructor"); 
      mmSocket = socket; 
      InputStream tmpIn = null; 
      OutputStream tmpOut = null; 

      // Get the input and output streams, using temp objects because 
      // member streams are final 
      try { 
       tmpIn = socket.getInputStream(); 
       tmpOut = socket.getOutputStream(); 
      } catch (IOException e) { } 

      mmInStream = tmpIn; 
      mmOutStream = tmpOut; 
     } 

     public void run() { 
      Log.d("THREAD", "inside run"); 
      byte[] buffer = new byte[256]; // buffer store for the stream 
      int bytes; // bytes returned from read() 

      // Keep listening to the InputStream until an exception occurs 
      while (true) { 
       Log.d("in loop", "waiting for data"); 
       try { 
        // Read from the InputStream 
        bytes = mmInStream.read(buffer);  // Get number of bytes and message in "buffer" 
        h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget();  // Send to message queue Handler 
        Log.d("recieve", "b " + bytes); 
       } catch (IOException e) { 
        break; 
       } 
      } 
     } 

     /* Call this from the main activity to send data to the remote device */ 
     public void write(String message) { 
      Log.d("TAG", "...Data to send: " + message + "..."); 
      byte[] msgBuffer = message.getBytes(); 
      try { 
       mmOutStream.write(msgBuffer); 
      } catch (IOException e) { 
       Log.d("TAG", "...Error data send: " + e.getMessage() + "...");  
       } 
     } 

     /* Call this from the main activity to shutdown the connection */ 
     public void cancel() { 
      try { 
       mmSocket.close(); 
      } catch (IOException e) { } 
     } 



    } 

我需要使用，因爲串口監視器總是等待數據只發送數據時，我按下發送服務？

編輯：Arduino的代碼：

#include <SoftwareSerial.h> 

int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2 
int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3 

SoftwareSerial bluetooth(bluetoothTx, bluetoothRx); 

void setup() 
{ 
    Serial.begin(9600); // Begin the serial monitor at 9600bps 

    bluetooth.begin(115200); // The Bluetooth Mate defaults to 115200bps 
    bluetooth.print("$$$"); // Enter command mode 
    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 
} 

    void loop() 
{ 
    if(bluetooth.available()) // If the bluetooth sent any characters 
    { 
    // Send any characters the bluetooth prints to the serial monitor 
    Serial.print((char)bluetooth.read()); 
    } 
    if(Serial.available()) // If stuff was typed in the serial monitor 
    { 
    char c = (char) Serial.read(); 
    // Send any characters the Serial monitor prints to the bluetooth 
    bluetooth.print(c); 
    } 
    // and loop forever and ever! 
} 

Answer 1

不，你並不需要一個服務，一個線程應該很好地工作。這段代碼實際上與通過Android SDK提供的BluetoothChat示例中提供的代碼完全相同，因此它應該可以工作。

通過使用串行監視器，您正在將數據發送到Arduino，所以我假設您使用Serial.println（「數據字符串」）或類似的東西回顯該數據。但是，由於您遵循了您引用的文章，因此您已將藍牙芯片連接到Arduino上的RX/TX引腳（0和1），這與串行監視器使用的引腳相同。我發現，當藍牙芯片連接到這些時，串行監視器仍然接收數據，但不能再發送它。所以你的問題在Arduino方面。

此外，此StackOverflow answer提到您不能同時在引腳0和1上同時使用串行監視器和藍牙。

如果您仍想使用串行監視器，請將藍牙芯片連接到不同的數字引腳，然後按here所述使用SoftwareSerial Arduino庫。

我已經對this post中描述的藍牙聊天樣本進行了簡單的修改，我的Android從Arduino接收沒有問題。