JavaFX + java-simple-serial-connector + Arduino

This example implement a simple Java application using java-simple-serial-connector library (jSSC) , with JavaFX user interface, send bytes to Arduino Esplora via USB.

package javafx_jssc;

import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import jssc.SerialPort;
import jssc.SerialPortException;
import jssc.SerialPortList;

public class JavaFX_jSSC extends Application {
    
    ObservableList<String> portList;
    
    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) {
        
        detectPort();

        final ComboBox comboBoxPorts = new ComboBox(portList);
        final TextField textFieldOut = new TextField();
        Button btnSend = new Button("Send");
        
        btnSend.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {

                if(comboBoxPorts.getValue() != null && 
                    !comboBoxPorts.getValue().toString().isEmpty()){
                    
                    String stringOut = textFieldOut.getText();
                    
                    try {
                        SerialPort serialPort = 
                            new SerialPort(comboBoxPorts.getValue().toString());                        
                        
                        serialPort.openPort();
                        serialPort.setParams(
                                SerialPort.BAUDRATE_9600,
                                SerialPort.DATABITS_8,
                                SerialPort.STOPBITS_1,
                                SerialPort.PARITY_NONE);
                        serialPort.writeBytes(stringOut.getBytes());
                        serialPort.closePort();
                        
                    } catch (SerialPortException ex) {
                        Logger.getLogger(
                            JavaFX_jSSC.class.getName()).log(Level.SEVERE, null, ex);
                    }
                    
                }else{
                    System.out.println("No SerialPort selected!");
                }
            }
        });
        
        VBox vBox = new VBox();
        vBox.getChildren().addAll(
                comboBoxPorts, 
                textFieldOut, 
                btnSend);
        
        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 static void main(String[] args) {
        launch(args);
    }
    
}

Arduino code in Esplora side (same as in the post "Serial communication between Arduino Esplora and PC").

#include <Esplora.h>
#include <TFT.h>
#include <SPI.h>

int prevSw1 = HIGH;
int incomingByte = 0;
String charsIn = "";
char printout[20];  //max char to print: 20
 
void setup() {
  
    EsploraTFT.begin();  
    EsploraTFT.background(0,0,0);
    EsploraTFT.stroke(255,255,255);  //preset stroke color
     
    //Setup Serial Port with baud rate of 9600
    Serial.begin(9600);
    
    //indicate start
    Esplora.writeRGB(255, 255, 255);
    delay(250);
    Esplora.writeRGB(0, 0, 0);
    
}
 
void loop() {
    int sw1 = Esplora.readButton(SWITCH_1);
    if(sw1 != prevSw1){
      if(sw1 == LOW){
        Serial.println("Hello from Arduino Esplora");
      }
      prevSw1 = sw1;
    }
    
    while (Serial.available()) {
      char charRead = Serial.read();
      charsIn.concat(charRead);
    }
    if(charsIn != ""){
      Serial.println("How are you, " + charsIn);
      charsIn.toCharArray(printout, 21);
      EsploraTFT.background(0,0,0);
      EsploraTFT.text(printout, 0, 10);
      charsIn = "";
    }
}

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