I'm working on a simple vehicle project, made with Arduino Uno and controlled by an Android App.
My matter is to send continuous stream from the app to my bluetooth module (HC-06) on Arduino. I did it with onTouch events and a new thread called from my main activity, but something is obviously wrong because the app seems to send each command as i want it to do, but the Arduino waits until the finger is off the button and receives all data (from action.down to action.up) at a time.
To understand : I update a small string like this "1255090" each time a command button is action.down or action_move, convert it to bytes and send it via bluetooth. If i briefly click on the button, Arduino will receive the correct string "1255090", but if i maintain my finger on the button, Arduino waits for the string, and when i release the button, Arduino receives for example "125509012540901253090125209012510901252090" (depending on how long i clicked).
Android activity (partial)
drive.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent m) {
if (m.getAction() != MotionEvent.ACTION_UP) {
accelerer(); // inscreases the speed
str_flux(); // constructs the string
byte[] bytes = new byte[0];
try { bytes = flux.getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); }
sendReceiveBT.write(bytes); // calls the thread's method
} else{ralentir();}
return true;
}
});
Thread
package com.*.vehicle.util;
import android.bluetooth.BluetoothSocket;
import android.util.Log;
import java.io.IOException;
import java.io.OutputStream;
public class SendReceiveBytes implements Runnable {
private BluetoothSocket btSocket;
private OutputStream btOutputStream = null;
String TAG = "SendReceiveBytes";
public SendReceiveBytes(BluetoothSocket socket) {
btSocket = socket;
try { btOutputStream = btSocket.getOutputStream(); } catch (IOException streamError) { Log.e(TAG, "Error when getting input or output Stream"); }
}
public void run() {
byte[] buffer = new byte[1024];
int bytes;
}
public void write(byte[] bytes) {
try {
btOutputStream.write(bytes); // Send the bytes to Arduino
btOutputStream.flush(); // don't know if it really does something...
Log.e(TAG, "SUCCESS !");
}
catch (IOException e) {
Log.e(TAG, "Error when writing to btOutputStream");
}
}
}
Arduino loop
void loop() {
s = Serial.readString(); // 1255090
if (s!=""){
Serial.println(s);
bt_direction = s.substring(0,1).toInt();
bt_speed = s.substring(1,4).toInt();
bt_angle = s.substring(4,7).toInt();
s = "";
} else{
if (bt_speed>0){
for(int i=bt_speed;i>=0;i--){bt_speed--;}
}
else{ bt_speed = 0; }
}
if (bt_direction==1){bt_dir = true;} else{bt_dir = false;}
if (bt_speed==0){stop_motor();} else{dc_motor(bt_speed, bt_dir);}
Serial.println(bt_direction);
servo_turn(bt_angle);
}
