Here is examples from
arduino-er.blogspot.com to demonstrate how to use RxTx Java Library in JavaFX/Swing application to communicate with Arduino Esplora via USB serial. javafx.scene.control.ColorPicker/javax.swing.JColorChooser are used to choice color, then send to Arduino via USB serial with RxTx Java Library, then to set the color of LCD screen/LED in Arduino side.
JavaFX version:
package javafxcolorpicker;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Enumeration;
import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.ColorPicker;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class JavaFXColorPicker extends Application {
MyRxTx myRxTx;
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("ColorPicker");
final Scene scene = new Scene(new HBox(20), 400, 100);
HBox box = (HBox) scene.getRoot();
box.setPadding(new Insets(5, 5, 5, 5));
final ColorPicker colorPicker = new ColorPicker();
//colorPicker.setValue(Color.CORAL);
colorPicker.setOnAction(new EventHandler() {
public void handle(Event t) {
scene.setFill(colorPicker.getValue());
Color color = colorPicker.getValue();
byte byteR = (byte)(color.getRed() * 255);
byte byteG = (byte)(color.getGreen() * 255);
byte byteB = (byte)(color.getBlue() * 255);
try {
byte[] bytesToSent =
new byte[]{byteB, byteG, byteR};
myRxTx.output.write(bytesToSent);
} catch (IOException ex) {
System.out.println(ex.toString());
}
}
});
box.getChildren().add(colorPicker);
primaryStage.setScene(scene);
primaryStage.show();
myRxTx = new MyRxTx();
myRxTx.initialize();
}
public static void main(String[] args) {
launch(args);
}
class MyRxTx implements SerialPortEventListener {
SerialPort serialPort;
/**
* The port we're normally going to use.
*/
private final String PORT_NAMES[] = {
"/dev/ttyACM0", //for Ubuntu
"/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyUSB0", // Linux
"COM3", // Windows
};
private BufferedReader input;
private OutputStream output;
private static final int TIME_OUT = 2000;
private static final int DATA_RATE = 9600;
public void initialize() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
//First, Find an instance of serial port as set in PORT_NAMES.
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId
= (CommPortIdentifier) portEnum.nextElement();
for (String portName : PORT_NAMES) {
if (currPortId.getName().equals(portName)) {
portId = currPortId;
break;
}
}
}
if (portId == null) {
System.out.println("Could not find COM port.");
return;
} else {
System.out.println("Port Name: " + portId.getName() + "\n"
+ "Current Owner: " + portId.getCurrentOwner() + "\n"
+ "Port Type: " + portId.getPortType());
}
try {
// open serial port, and use class name for the appName.
serialPort = (SerialPort) portId.open(this.getClass().getName(),
TIME_OUT);
// set port parameters
serialPort.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
// open the streams
input = new BufferedReader(
new InputStreamReader(serialPort.getInputStream()));
output = serialPort.getOutputStream();
// add event listeners
serialPort.addEventListener(this);
serialPort.notifyOnDataAvailable(true);
} catch (Exception e) {
System.err.println(e.toString());
}
}
@Override
public void serialEvent(SerialPortEvent spe) {
if (spe.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
final String inputLine = input.readLine();
System.out.println(inputLine);
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
/**
* This should be called when you stop using the port. This will prevent
* port locking on platforms like Linux.
*/
public synchronized void close() {
if (serialPort != null) {
serialPort.removeEventListener();
serialPort.close();
}
}
}
}
Java Swing version:
package javaswingcolorpicker;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Enumeration;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
public class JavaSwingColorPicker extends JFrame {
MyRxTx myRxTx;
public JavaSwingColorPicker() {
super("JColorChooser Test Frame");
setSize(200, 100);
final Container contentPane = getContentPane();
final JButton go = new JButton("Show JColorChooser");
go.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Color c;
c = JColorChooser.showDialog(
((Component) e.getSource()).getParent(),
"Demo", Color.blue);
contentPane.setBackground(c);
byte byteR = (byte)(c.getRed());
byte byteG = (byte)(c.getGreen());
byte byteB = (byte)(c.getBlue() );
try {
byte[] bytesToSent =
new byte[]{byteB, byteG, byteR};
myRxTx.output.write(bytesToSent);
} catch (IOException ex) {
System.out.println(ex.toString());
}
}
});
contentPane.add(go, BorderLayout.SOUTH);
setDefaultCloseOperation(EXIT_ON_CLOSE);
myRxTx = new MyRxTx();
myRxTx.initialize();
}
public static void main(String[] args) {
JavaSwingColorPicker myColorPicker = new JavaSwingColorPicker();
myColorPicker.setVisible(true);
}
class MyRxTx implements SerialPortEventListener {
SerialPort serialPort;
/**
* The port we're normally going to use.
*/
private final String PORT_NAMES[] = {
"/dev/ttyACM0", //for Ubuntu
"/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyUSB0", // Linux
"COM3", // Windows
};
private BufferedReader input;
private OutputStream output;
private static final int TIME_OUT = 2000;
private static final int DATA_RATE = 9600;
public void initialize() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
//First, Find an instance of serial port as set in PORT_NAMES.
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId
= (CommPortIdentifier) portEnum.nextElement();
for (String portName : PORT_NAMES) {
if (currPortId.getName().equals(portName)) {
portId = currPortId;
break;
}
}
}
if (portId == null) {
System.out.println("Could not find COM port.");
return;
} else {
System.out.println("Port Name: " + portId.getName() + "\n"
+ "Current Owner: " + portId.getCurrentOwner() + "\n"
+ "Port Type: " + portId.getPortType());
}
try {
// open serial port, and use class name for the appName.
serialPort = (SerialPort) portId.open(this.getClass().getName(),
TIME_OUT);
// set port parameters
serialPort.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
// open the streams
input = new BufferedReader(
new InputStreamReader(serialPort.getInputStream()));
output = serialPort.getOutputStream();
// add event listeners
serialPort.addEventListener(this);
serialPort.notifyOnDataAvailable(true);
} catch (Exception e) {
System.err.println(e.toString());
}
}
@Override
public void serialEvent(SerialPortEvent spe) {
if (spe.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
final String inputLine = input.readLine();
System.out.println(inputLine);
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
/**
* This should be called when you stop using the port. This will prevent
* port locking on platforms like Linux.
*/
public synchronized void close() {
if (serialPort != null) {
serialPort.removeEventListener();
serialPort.close();
}
}
}
}
For the code in Arduino side, refer:
http://arduino-er.blogspot.com/2014/01/send-array-of-byte-from-pc-to-arduino.html
