Send data to arduino from PC in java over Serial (RXTXlib)

Projects Interfacing w/ Software on the Computer
14

I already said:

All my arduino codes work fine on the serial monitor.

It means I always test on the serial monitor before testing with the java program :slight_smile:
Since I couldn't solve the problem I turned to JSSC library which is quite similar to RXTX.
Now it works fine and I can command arduino from java. That's the code for java :

import jssc.SerialPort;
import jssc.SerialPortException;

/**
 *
 * @author scream3r
 */
public class Write {

    /**
     * @param args the command line arguments
     * @throws InterruptedException 
     */
    public static void main(String[] args) throws InterruptedException {
        SerialPort serialPort = new SerialPort("COM2");
        try {
            System.out.println("Port opened: " + serialPort.openPort());
            System.out.println("Params setted: " + serialPort.setParams(9600, 8, 1, 0));
            Thread.sleep(3000);
            for (int i = 0; i<10; i++){
            	if (i%2 == 0){
            		System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("1".getBytes()));
            	}
            	else {
            		System.out.println("\"Hello World!!!\" successfully writen to port: " + serialPort.writeBytes("0".getBytes()));
            	}
            	Thread.sleep(1000);
            }
            System.out.println("Port closed: " + serialPort.closePort());
        }
        catch (SerialPortException ex){
            System.out.println(ex);
        }
    }
}

And that's the Arduino code :

int r ;
int led = 13 ;
void setup(){
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}
void loop(){
  if (Serial.available()){
    r = Serial.read() ;
    if (r == 49){
      digitalWrite(led, HIGH);
    }
    else {
      digitalWrite(led, LOW);
    }
  }
}

Thank you all for your help :slight_smile: