Question

我一直试图通过蓝牙模块HC-05将数据从arduino发送到Android应用程序，我无法从应用程序中显示arduino的任何读数

arduino代码是：

void setup() {
  Serial.begin(9600);

}

void loop()
{
  char c;
if(Serial.available())
  {
   c = Serial.read();
   Serial.print(c);
  }
}

Android代码是：

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.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Handler;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;

public class MainActivity extends Activity {
    //    private final String DEVICE_NAME="MyBTBee";
    private final String DEVICE_ADDRESS="30:14:12:18:01:38";
    private final UUID PORT_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");//Serial Port Service ID
    private BluetoothDevice device;
    private BluetoothSocket socket;
    private OutputStream outputStream;
    private InputStream inputStream;
    Button startButton, sendButton,clearButton,stopButton;
    TextView textView;
    EditText editText;
    boolean deviceConnected=false;
    Thread thread;
    byte buffer[];
    int bufferPosition;
    boolean stopThread;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startButton = (Button) findViewById(R.id.buttonStart);
        sendButton = (Button) findViewById(R.id.buttonSend);
        clearButton = (Button) findViewById(R.id.buttonClear);
        stopButton = (Button) findViewById(R.id.buttonStop);
        editText = (EditText) findViewById(R.id.editText);
        textView = (TextView) findViewById(R.id.textView);
        setUiEnabled(false);

    }

    public void setUiEnabled(boolean bool)
    {
        startButton.setEnabled(!bool);
        sendButton.setEnabled(bool);
        stopButton.setEnabled(bool);
        textView.setEnabled(bool);

    }

    public boolean BTinit()
    {
        boolean found=false;
        BluetoothAdapter bluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
        if (bluetoothAdapter == null) {
            Toast.makeText(getApplicationContext(),"Device doesnt Support Bluetooth",Toast.LENGTH_SHORT).show();
        }
        if(!bluetoothAdapter.isEnabled())
        {
            Intent enableAdapter = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableAdapter, 0);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        Set<BluetoothDevice> bondedDevices = bluetoothAdapter.getBondedDevices();
        if(bondedDevices.isEmpty())
        {
            Toast.makeText(getApplicationContext(),"Please Pair the Device first",Toast.LENGTH_SHORT).show();
        }
        else
        {
            for (BluetoothDevice iterator : bondedDevices)
            {
                if(iterator.getAddress().equals(DEVICE_ADDRESS))
                {
                    device=iterator;
                    found=true;
                    break;
                }
            }
        }
        return found;
    }

    public boolean BTconnect()
    {
        boolean connected=true;
        try {
            socket = device.createRfcommSocketToServiceRecord(PORT_UUID);
            socket.connect();
        } catch (IOException e) {
            e.printStackTrace();
            connected=false;
        }
        if(connected)
        {
            try {
                outputStream=socket.getOutputStream();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                inputStream=socket.getInputStream();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }


        return connected;
    }

    public void onClickStart(View view) {
        if(BTinit())
        {
            if(BTconnect())
            {
                setUiEnabled(true);
                deviceConnected=true;
                beginListenForData();
                textView.append("\nConnection Opened!\n");
            }

        }
    }

    void beginListenForData()
    {
        final Handler handler = new Handler();
        stopThread = false;
        buffer = new byte[1024];
        Thread thread  = new Thread(new Runnable()
        {
            public void run()
            {
                while(!Thread.currentThread().isInterrupted() && !stopThread)
                {
                    try
                    {
                        int byteCount = inputStream.available();
                        if(byteCount > 0)
                        {
                            byte[] rawBytes = new byte[byteCount];
                            inputStream.read(rawBytes);
                            final String string=new String(rawBytes,"UTF-8");
                            handler.post(new Runnable() {
                                public void run()
                                {
                                    textView.append(string);
                                }
                            });

                        }
                    }
                    catch (IOException ex)
                    {
                        stopThread = true;
                    }
                }
            }
        });

        thread.start();
    }

    public void onClickSend(View view) {
        String string = editText.getText().toString();
        string.concat("\n");
        try {
            outputStream.write(string.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
        textView.append("\nSent Data:"+string+"\n");

    }

    public void onClickStop(View view) throws IOException {
        stopThread = true;
        outputStream.close();
        inputStream.close();
        socket.close();
        setUiEnabled(false);
        deviceConnected=false;
        textView.append("\nConnection Closed!\n");
    }

    public void onClickClear(View view) {
        textView.setText("");
    }
}

Answer 1

我现在看到的第一个问题是你的Arduino代码：由于您使用相同的串行输入和输出，因此您永远不会通过蓝牙发送消息。如果您使用Serial1使用Arduino Mega会修复此问题（使用TX1和RX1）。如果您不使用Mega，则应考虑使用SerialSoftware库，该库允许您创建新的自定义序列。

很高兴看到你的Arduino设置，看你如何连接它。

希望能帮助您，随时提出任何问题。

将数据从Arduino发送到Android

1 个答案: