Overview

A easy way to communicate between your Arduino and PC. Use the built-in serial port of an Arduino to communicate with a Java program. In this demo, a simple graphical user interface is made with a slider to show the position of a potentiometer. The program could be easily extended to send data from an Arduino to a web site. Check back for more videos on this topic.

Arduino Code:

void setup(){
Serial.begin(9600);
}
void loop(){
int sensorValue = analogRead(A0);
Serial.println(sensorValue);
delay(1);
}

Main.java

import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JSlider;
import com.fazecast.jSerialComm.*;

public class Main {

    public static void main(String[] args) {

        JFrame window = new JFrame();
        JSlider slider = new JSlider();
        slider.setMaximum(1023);
        window.add(slider);
        window.pack();
        window.setVisible(true);

        SerialPort[] ports = SerialPort.getCommPorts();
        System.out.println("Select a port:");
        int i = 1;
        for(SerialPort port : ports)
            System.out.println(i++ +  ": " + port.getSystemPortName());
        Scanner s = new Scanner(System.in);
        int chosenPort = s.nextInt();

        SerialPort serialPort = ports[chosenPort - 1];
        if(serialPort.openPort())
            System.out.println("Port opened successfully.");
        else {
            System.out.println("Unable to open the port.");
            return;
        }
        //serialPort.setComPortParameters(9600, 8, 1, SerialPort.NO_PARITY);
        serialPort.setComPortTimeouts(SerialPort.TIMEOUT_READ_BLOCKING, 0, 0);

        Scanner data = new Scanner(serialPort.getInputStream());
        int value = 0;
        while(data.hasNextLine()){
            try{
                value = Integer.parseInt(data.nextLine());
                System.out.println("data : "+data);
                System.out.println("value : "+value);
                System.out.println("data : "+data.nextLine());
            }catch(Exception e){}
            slider.setValue(value);

        }
        System.out.println("Done.");
    }

}

Maven

The latest version of fazecast is available from Maven Central at the following coordinates:

<dependency>
    <groupId>com.fazecast</groupId>
    <artifactId>jSerialComm</artifactId>
    <version>[2.0.0,3.0.0)</version>
</dependency>