Tuesday, September 8, 2015

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

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