我创建了一个Android应用程序（理论上）通过蓝牙将数据发送到arduino。 我知道我已经设法获得连接（蓝牙模块上的led停止闪烁）但是当我写一些值时，Serial.available（）并没有改变。 我尝试过使用不同的应用程序（来自游戏商店） - 没有运气。
假设读取数据的arduino代码：
void setup() {
Serial.begin(9600);
Serial.println("Simple Motor Shield sketch");
}
void loop() {
if(Serial.available()>0){
Serial.println("in");
for(int i=0;i<=2;i++){
joystick[i] = Serial.read();
}
for(int i=0;i<=2;i++){
Serial.println(joystick[i]);
}
delay(1);
}
}
joystick []是一个int数组
android代码：
bluetoothIn = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) { //if message is what we want
String readMessage = (String) msg.obj; // msg.arg1 = bytes from connect thread
recDataString.append(readMessage); //keep appending to string until ~
int endOfLineIndex = recDataString.indexOf("~"); // determine the end-of-line
if (endOfLineIndex > 0) { // make sure there data before ~
String dataInPrint = recDataString.substring(0, endOfLineIndex); // extract string
int dataLength = dataInPrint.length(); //get length of data received
recDataString.delete(0, recDataString.length()); //clear all string data
}
}
}
};
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
checkBTState();
// Set up onClick listeners for buttons to send 1 or 0 to turn on/off LED
btnLeft.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
mConnectedThread.write("0"); // Send "0" via Bluetooth
Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
btnRight.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
mConnectedThread.write("1"); // Send "1" via Bluetooth
Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
layout_joystick.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View arg0, MotionEvent arg1) {
js.drawStick(arg1);
if (arg1.getAction() == MotionEvent.ACTION_DOWN
|| arg1.getAction() == MotionEvent.ACTION_MOVE) {
//int x = js.getX();
//int y = js.getY();
int angle = (int)js.getAngle();
int distance = (int)js.getDistance();
int maxDist = js.getOffset()+js.getLayoutHeight();
distance =(int)(distance/(maxDist/9));
angle=(int)(angle/40);
distance=Math.max(distance,-9);
distance=Math.min(distance,9);
angle=Math.max(angle,-9);
angle=Math.min(angle,9);
//mConnectedThread.write(String.valueOf(x));
//mConnectedThread.write(String.valueOf(y));
mConnectedThread.write(String.valueOf(angle));
mConnectedThread.write(String.valueOf(distance));
Log.i("Bluetooth","Distance: " + distance);
Log.i("Bluetooth","Angle: " + angle);
}
return true;
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
//creates secure outgoing connecetion with BT device using UUID
}
@Override
public void onResume() {
super.onResume();
//Get MAC address from DeviceListActivity via intent
Intent intent = getIntent();
//Get the MAC address from the DeviceListActivty via EXTRA
address = intent.getStringExtra(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
//create device and set the MAC address
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_LONG).show();
}
// Establish the Bluetooth socket connection.
try
{
btSocket.connect();
} catch (IOException e) {
try
{
btSocket.close();
} catch (IOException e2)
{
//insert code to deal with this
}
}
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
//I send a character when resuming.beginning transmission to check device is connected
//If it is not an exception will be thrown in the write method and finish() will be called
mConnectedThread.write("0");
}
@Override
public void onPause()
{
super.onPause();
try
{
//Don't leave Bluetooth sockets open when leaving activity
btSocket.close();
} catch (IOException e2) {
//insert code to deal with this
}
}
//Checks that the Android device Bluetooth is available and prompts to be turned on if off
private void checkBTState() {
if(btAdapter==null) {
Toast.makeText(getBaseContext(), "Device does not support bluetooth", Toast.LENGTH_LONG).show();
} else {
if (btAdapter.isEnabled()) {
} else {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
//create new class for connect thread
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
//creation of the connect thread
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
//Create I/O streams for connection
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[256];
int bytes;
// Keep looping to listen for received messages
while (true) {
try {
bytes = mmInStream.read(buffer); //read bytes from input buffer
String readMessage = new String(buffer, 0, bytes);
// Send the obtained bytes to the UI Activity via handler
bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
} catch (IOException e) {
break;
}
}
}
//write method
public void write(String input) {
byte[] msgBuffer = input.getBytes(); //converts entered String into bytes
try {
mmOutStream.write(msgBuffer); //write bytes over BT connection via outstream
} catch (IOException e) {
//if you cannot write, close the application
Toast.makeText(getBaseContext(), "Connection Failure", Toast.LENGTH_LONG).show();
finish();
}
}
}
答案 0 :(得分：0)
对不起，对不起，我基本上想做的是检查蓝牙串口连接上是否有可用的数据。 所以当我发送数据时，我希望Serial.available（）大于0。但是，当我发送数据时，Serial.available（）和Serial.Read（）似乎不起作用。 *我已设法使用以下程序解决问题：http://www.circuitmagic.com/arduino/arduino-and-bluetooth-hc-06-to-control-the-led-with-android-device/ *
答案 1 :(得分：0)
我认为你已经在arduino板的串行RX，TX引脚上连接了蓝牙模块。不是这种情况。您需要使用单独的串行与蓝牙通信。您可以使用软件序列来实现此目的，否则蓝牙模块将无法正常工作。 这背后的原因是arduino使用相同的串行引脚与PC通信（串行终端和程序加载），因此无法同时向蓝牙发送数据。
请看这里：https://bellcode.wordpress.com/2012/01/02/android-and-arduino-bluetooth-communication/