Monday, August 22, 2016
Example of using jSSC communicate between JavaFX and Arduino Uno via USB Serial port
Example of using jSSC communicate between JavaFX and Arduino Uno via USB Serial port
Prepare a simple sketch run on Arduino Uno to send a counting number to serial port, tested on Windows 10.
BlinkUSB.ino
/*
* Send number to Serial
*/
int i = 0;
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin 13 as an output.
pinMode(13, OUTPUT);
Serial.begin(9600);
}
// the loop function runs over and over again forever
void loop() {
Serial.print(i);
i++;
digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
Read last post to "Prepare jSSC - download and add library to NetBeans, and create project using jSSC library".
modify the java code, JavaFX_jssc_Uno.java
/*
* Example of using jSSC library to handle serial port
* Receive number from Arduino via USB/Serial and display on Label
*/
package javafx_jssc_uno;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import jssc.SerialPort;
import static jssc.SerialPort.MASK_RXCHAR;
import jssc.SerialPortEvent;
import jssc.SerialPortException;
import jssc.SerialPortList;
public class JavaFX_jssc_Uno extends Application {
SerialPort arduinoPort = null;
ObservableList<String> portList;
Label labelValue;
private void detectPort(){
portList = FXCollections.observableArrayList();
String[] serialPortNames = SerialPortList.getPortNames();
for(String name: serialPortNames){
System.out.println(name);
portList.add(name);
}
}
@Override
public void start(Stage primaryStage) {
labelValue = new Label();
detectPort();
final ComboBox comboBoxPorts = new ComboBox(portList);
comboBoxPorts.valueProperty()
.addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observable,
String oldValue, String newValue) {
System.out.println(newValue);
disconnectArduino();
connectArduino(newValue);
}
});
VBox vBox = new VBox();
vBox.getChildren().addAll(
comboBoxPorts, labelValue);
StackPane root = new StackPane();
root.getChildren().add(vBox);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public boolean connectArduino(String port){
System.out.println("connectArduino");
boolean success = false;
SerialPort serialPort = new SerialPort(port);
try {
serialPort.openPort();
serialPort.setParams(
SerialPort.BAUDRATE_9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
serialPort.setEventsMask(MASK_RXCHAR);
serialPort.addEventListener((SerialPortEvent serialPortEvent) -> {
if(serialPortEvent.isRXCHAR()){
try {
String st = serialPort.readString(serialPortEvent
.getEventValue());
System.out.println(st);
//Update label in ui thread
Platform.runLater(() -> {
labelValue.setText(st);
});
} catch (SerialPortException ex) {
Logger.getLogger(JavaFX_jssc_Uno.class.getName())
.log(Level.SEVERE, null, ex);
}
}
});
arduinoPort = serialPort;
success = true;
} catch (SerialPortException ex) {
Logger.getLogger(JavaFX_jssc_Uno.class.getName())
.log(Level.SEVERE, null, ex);
System.out.println("SerialPortException: " + ex.toString());
}
return success;
}
public void disconnectArduino(){
System.out.println("disconnectArduino()");
if(arduinoPort != null){
try {
arduinoPort.removeEventListener();
if(arduinoPort.isOpened()){
arduinoPort.closePort();
}
} catch (SerialPortException ex) {
Logger.getLogger(JavaFX_jssc_Uno.class.getName())
.log(Level.SEVERE, null, ex);
}
}
}
@Override
public void stop() throws Exception {
disconnectArduino();
super.stop();
}
public static void main(String[] args) {
launch(args);
}
}
Next:
- JavaFX + jSSC - read byte from Arduino Uno, read from Analog Input
