├── .github └── FUNDING.yml ├── .gitignore ├── LICENSE ├── README.md ├── pom.xml ├── scheme ├── led-button-distancesensor.fzz └── wiring.png ├── screenshot.png └── src └── main ├── java ├── be │ └── webtechie │ │ ├── DashboardApp.java │ │ ├── gpio │ │ ├── ButtonChangeEventListener.java │ │ ├── DistanceSensorMeasurement.java │ │ └── GpioHelper.java │ │ ├── ui │ │ └── DashboardScreen.java │ │ └── util │ │ └── CleanExit.java └── module-info.java └── resources └── log4j2.xml /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | # These are supported funding model platforms 2 | 3 | github: FDelporte 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /logs/ 2 | /target/ 3 | /.idea/ 4 | *.iml 5 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Getting started with JavaFX on Raspberry Pi 2 | 3 | Example application to demonstrate the use of JavaFX on a Raspberry Pi in combination with Pi4J and some basic (and cheap) hardware components. 4 | 5 | ![Screenshot](screenshot.png) 6 | 7 | ## Build the application 8 | 9 | This application is a Maven project. You can run it on PC, but will not do a lot as it needs Pi4J... 10 | 11 | To build for the Raspberry Pi: 12 | 13 | ``` 14 | mvn clean package 15 | ``` 16 | 17 | ## Run on a Raspberry Pi 18 | 19 | ### Install Pi4J 20 | 21 | ``` 22 | $ curl -sSL https://pi4j.com/install | sudo bash 23 | ``` 24 | 25 | ### Connect the components 26 | 27 | ![Wiring](scheme/wiring.png) 28 | 29 | ### Run the application 30 | 31 | Copy the generated file "javamagazine-javafx-example-0.0.1-jar-with-dependencies.jar" to your Pi and start it with 32 | 33 | ``` 34 | $ java -jar javamagazine-javafx-example-0.0.1-jar-with-dependencies.jar 35 | ``` 36 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 3 | 4.0.0 4 | be.webtechie 5 | javamagazine-javafx-example 6 | 0.0.1 7 | 8 | 9 | UTF-8 10 | 11 11 | 11 12 | 13 | 14 | 15 | 16 | org.openjfx 17 | javafx-web 18 | 11.0.2 19 | 20 | 21 | 22 | org.apache.logging.log4j 23 | log4j-core 24 | 2.17.1 25 | 26 | 27 | 28 | eu.hansolo 29 | tilesfx 30 | 11.13 31 | 32 | 33 | 34 | com.pi4j 35 | pi4j-core 36 | 1.2 37 | 38 | 39 | 40 | 41 | 42 | 43 | org.apache.maven.plugins 44 | maven-compiler-plugin 45 | 3.8.0 46 | 47 | 48 | 49 | maven-assembly-plugin 50 | 2.2.1 51 | 52 | 53 | jar-with-dependencies 54 | 55 | 56 | 57 | true 58 | be.webtechie.DashboardApp 59 | 60 | 61 | 62 | 63 | 64 | make-assembly 65 | package 66 | 67 | single 68 | 69 | 70 | 71 | 72 | 73 | 74 | -------------------------------------------------------------------------------- /scheme/led-button-distancesensor.fzz: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FDelporte/JavaMagazineJavaFxOnRaspberryPi/247360ed4a6bc8632a108ddd681651a8587d4096/scheme/led-button-distancesensor.fzz -------------------------------------------------------------------------------- /scheme/wiring.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FDelporte/JavaMagazineJavaFxOnRaspberryPi/247360ed4a6bc8632a108ddd681651a8587d4096/scheme/wiring.png -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FDelporte/JavaMagazineJavaFxOnRaspberryPi/247360ed4a6bc8632a108ddd681651a8587d4096/screenshot.png -------------------------------------------------------------------------------- /src/main/java/be/webtechie/DashboardApp.java: -------------------------------------------------------------------------------- 1 | package be.webtechie; 2 | 3 | import be.webtechie.util.CleanExit; 4 | import be.webtechie.gpio.GpioHelper; 5 | import be.webtechie.ui.DashboardScreen; 6 | import javafx.application.Application; 7 | import javafx.application.Platform; 8 | import javafx.scene.Scene; 9 | import javafx.stage.Stage; 10 | 11 | /** 12 | * JavaFX Application 13 | */ 14 | public class DashboardApp extends Application { 15 | 16 | private GpioHelper gpioHelper; 17 | 18 | @Override 19 | public void start(Stage stage) { 20 | Platform.setImplicitExit(true); 21 | 22 | this.gpioHelper = new GpioHelper(); 23 | 24 | var scene = new Scene(new DashboardScreen(this.gpioHelper), 640, 480); 25 | stage.setScene(scene); 26 | stage.setTitle("JavaFX demo application on Raspberry Pi"); 27 | stage.show(); 28 | 29 | // Make sure the application quits completely on close 30 | stage.setOnCloseRequest(t -> CleanExit.doExit(this.gpioHelper.getGpioController())); 31 | } 32 | 33 | public static void main(String[] args) { 34 | launch(); 35 | } 36 | 37 | } -------------------------------------------------------------------------------- /src/main/java/be/webtechie/gpio/ButtonChangeEventListener.java: -------------------------------------------------------------------------------- 1 | package be.webtechie.gpio; 2 | 3 | import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent; 4 | import com.pi4j.io.gpio.event.GpioPinListenerDigital; 5 | import java.time.LocalTime; 6 | import java.time.format.DateTimeFormatter; 7 | import javafx.scene.chart.XYChart; 8 | import org.apache.logging.log4j.LogManager; 9 | import org.apache.logging.log4j.Logger; 10 | 11 | /** 12 | * Listener which will be called each time the button value changes. 13 | */ 14 | public class ButtonChangeEventListener implements GpioPinListenerDigital { 15 | 16 | private static final Logger logger = LogManager.getLogger(ButtonChangeEventListener.class); 17 | 18 | /** 19 | * Data series containing the button state change timestamps. 20 | */ 21 | private final XYChart.Series data = new XYChart.Series<>(); 22 | 23 | /** 24 | * Constructor 25 | */ 26 | public ButtonChangeEventListener() { 27 | this.data.setName("Button pressed"); 28 | } 29 | 30 | /** 31 | * Event handler for the button 32 | */ 33 | @Override 34 | public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) { 35 | var timeStamp = LocalTime.now().format(DateTimeFormatter.ofPattern("HH.mm.ss")); 36 | this.data.getData().add(new XYChart.Data<>(timeStamp, event.getState().isHigh() ? 1 : 0)); 37 | 38 | logger.info("Button state changed to {}", event.getState().isHigh() ? "high" : "low"); 39 | } 40 | 41 | /** 42 | * @return The data as {@link XYChart.Series} 43 | */ 44 | public XYChart.Series getData() { 45 | return this.data; 46 | } 47 | } -------------------------------------------------------------------------------- /src/main/java/be/webtechie/gpio/DistanceSensorMeasurement.java: -------------------------------------------------------------------------------- 1 | package be.webtechie.gpio; 2 | 3 | import com.pi4j.io.gpio.GpioPinDigitalInput; 4 | import com.pi4j.io.gpio.GpioPinDigitalOutput; 5 | import com.pi4j.io.gpio.PinState; 6 | import java.text.SimpleDateFormat; 7 | import java.util.Date; 8 | import java.util.concurrent.TimeUnit; 9 | import javafx.scene.chart.XYChart; 10 | import org.apache.logging.log4j.LogManager; 11 | import org.apache.logging.log4j.Logger; 12 | 13 | /** 14 | * Measures the distance value. 15 | */ 16 | public class DistanceSensorMeasurement implements Runnable { 17 | 18 | private static final Logger logger = LogManager.getLogger(DistanceSensorMeasurement.class); 19 | 20 | /** 21 | * Data series containing the distance measurements. 22 | */ 23 | private final XYChart.Series data = new XYChart.Series<>(); 24 | 25 | /** 26 | * The GPIO's connected to the distance sensor. 27 | */ 28 | private final GpioPinDigitalOutput trigger; 29 | private final GpioPinDigitalInput echo; 30 | 31 | /** 32 | * Constructor 33 | */ 34 | public DistanceSensorMeasurement(GpioPinDigitalOutput trigger, GpioPinDigitalInput echo) { 35 | if (trigger == null || echo == null) { 36 | throw new IllegalArgumentException("Distance sensor pins not initialized"); 37 | } 38 | this.trigger = trigger; 39 | this.echo = echo; 40 | this.data.setName("Distance"); 41 | } 42 | 43 | /** 44 | * Perform a distance measurement and add the result to the data. 45 | */ 46 | @Override 47 | public void run() { 48 | // Set trigger high for 0.01ms 49 | this.trigger.pulse(10, PinState.HIGH, true, TimeUnit.NANOSECONDS); 50 | 51 | // Start the measurement 52 | while (this.echo.isLow()) { 53 | // Wait until the echo pin is high, indicating the ultrasound was sent 54 | } 55 | long start = System.nanoTime(); 56 | 57 | // Wait till measurement is finished 58 | while (this.echo.isHigh()) { 59 | // Wait until the echo pin is low, indicating the ultrasound was received back 60 | } 61 | long end = System.nanoTime(); 62 | 63 | // Output the distance 64 | float measuredSeconds = getSecondsDifference(start, end); 65 | int distance = getDistance(measuredSeconds); 66 | logger.info("Distance is: {}cm for {}s ", distance, measuredSeconds); 67 | 68 | var timeStamp = new SimpleDateFormat("HH.mm.ss").format(new Date()); 69 | this.data.getData().add(new XYChart.Data<>(timeStamp, distance)); 70 | } 71 | 72 | /** 73 | * @return The data as {@link XYChart.Series} 74 | */ 75 | public XYChart.Series getData() { 76 | return this.data; 77 | } 78 | 79 | /** 80 | * Get the distance (in cm) for a given duration. 81 | * The calculation is based on the speed of sound which is 34300 cm/s. 82 | * Since the sound is making a round trip, the distance is divided by 2. 83 | * 84 | * @param seconds Number of seconds 85 | * @return Distance in cm 86 | */ 87 | private static int getDistance(float seconds) { 88 | return Math.round(seconds * 34300 / 2); 89 | } 90 | 91 | /** 92 | * Get the number of seconds between two nanosecond timestamps. 93 | * 1 second = 1000000000 nanoseconds 94 | * 95 | * @param start Start timestamp in nanoseconds 96 | * @param end End timestamp in nanoseconds 97 | * @return Difference in seconds 98 | */ 99 | private static float getSecondsDifference(long start, long end) { 100 | return (end - start) / 1000000000F; 101 | } 102 | } -------------------------------------------------------------------------------- /src/main/java/be/webtechie/gpio/GpioHelper.java: -------------------------------------------------------------------------------- 1 | package be.webtechie.gpio; 2 | 3 | import com.pi4j.io.gpio.GpioController; 4 | import com.pi4j.io.gpio.GpioFactory; 5 | import com.pi4j.io.gpio.GpioPinDigitalInput; 6 | import com.pi4j.io.gpio.GpioPinDigitalOutput; 7 | import com.pi4j.io.gpio.Pin; 8 | import com.pi4j.io.gpio.PinPullResistance; 9 | import com.pi4j.io.gpio.PinState; 10 | import com.pi4j.io.gpio.RaspiPin; 11 | import java.util.concurrent.Executors; 12 | import java.util.concurrent.ScheduledExecutorService; 13 | import java.util.concurrent.TimeUnit; 14 | import javafx.scene.chart.XYChart; 15 | import javafx.scene.chart.XYChart.Series; 16 | import org.apache.logging.log4j.LogManager; 17 | import org.apache.logging.log4j.Logger; 18 | 19 | /** 20 | * Helper class which bundles the Pi4J functions. 21 | */ 22 | public class GpioHelper { 23 | 24 | private static final Logger logger = LogManager.getLogger(GpioHelper.class); 25 | 26 | /** 27 | * The pins we are using in our example. 28 | */ 29 | private static final Pin PIN_LED = RaspiPin.GPIO_29; // BCM 21, Header pin 40 30 | private static final Pin PIN_BUTTON = RaspiPin.GPIO_27; // BCM 16, Header pin 36 31 | private static final Pin PIN_ECHO = RaspiPin.GPIO_05; // BCM 24, Header pin 18 32 | private static final Pin PIN_TRIGGER = RaspiPin.GPIO_01; // BCM 18, Header pin 12 33 | 34 | /** 35 | * The connected hardware components. 36 | */ 37 | private GpioController gpioController; 38 | 39 | /** 40 | * The Pi4J GPIO input and outputs. 41 | */ 42 | private GpioPinDigitalOutput led = null; 43 | 44 | /** 45 | * The GPIO handlers. 46 | */ 47 | private ButtonChangeEventListener buttonChangeEventListener = null; 48 | private DistanceSensorMeasurement distanceSensorMeasurement = null; 49 | 50 | /** 51 | * Constructor. 52 | */ 53 | public GpioHelper() { 54 | try { 55 | // Initialize the GPIO controller 56 | this.gpioController = GpioFactory.getInstance(); 57 | 58 | // Initialize the led pin as a digital output pin with initial low state 59 | this.led = gpioController.provisionDigitalOutputPin(PIN_LED, "RED", PinState.LOW); 60 | this.led.setShutdownOptions(true, PinState.LOW); 61 | 62 | // Initialize the input pin with pull down resistor 63 | GpioPinDigitalInput button = gpioController 64 | .provisionDigitalInputPin(PIN_BUTTON, "Button", PinPullResistance.PULL_DOWN); 65 | 66 | // Initialize the pins for the distance sensor and start thread 67 | GpioPinDigitalOutput trigger = gpioController.provisionDigitalOutputPin(PIN_TRIGGER, "Trigger", PinState.LOW); 68 | GpioPinDigitalInput echo = gpioController.provisionDigitalInputPin(PIN_ECHO, "Echo", PinPullResistance.PULL_UP); 69 | this.distanceSensorMeasurement = new DistanceSensorMeasurement(trigger, echo); 70 | ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor(); 71 | executorService.scheduleAtFixedRate(this.distanceSensorMeasurement, 1, 1, TimeUnit.SECONDS); 72 | 73 | // Attach an event listener 74 | this.buttonChangeEventListener = new ButtonChangeEventListener(); 75 | button.addListener(this.buttonChangeEventListener); 76 | } catch (UnsatisfiedLinkError | IllegalArgumentException ex) { 77 | logger.error("Problem with Pi4J! Probably running on non-Pi-device or Pi4J not installed. Error: {}", 78 | ex.getMessage()); 79 | } 80 | } 81 | 82 | public GpioController getGpioController() { 83 | return this.gpioController; 84 | } 85 | 86 | /** 87 | * Set the state of the LED. 88 | * 89 | * @param on Flag true if the LED must be switched on 90 | */ 91 | public void setLed(boolean on) { 92 | if (this.led != null) { 93 | if (on) { 94 | this.led.high(); 95 | } else { 96 | this.led.low(); 97 | } 98 | } 99 | } 100 | 101 | /** 102 | * Get the data from the button. 103 | * 104 | * @return {@link XYChart.Series} 105 | */ 106 | public XYChart.Series getButtonEvents() { 107 | if (this.buttonChangeEventListener != null) { 108 | return this.buttonChangeEventListener.getData(); 109 | } else { 110 | return new Series<>(); 111 | } 112 | } 113 | 114 | /** 115 | * Get the data from the distance measurement. 116 | * 117 | * @return {@link XYChart.Series} 118 | */ 119 | public XYChart.Series getDistanceMeasurements() { 120 | if (this.distanceSensorMeasurement != null) { 121 | return this.distanceSensorMeasurement.getData(); 122 | } else { 123 | return new Series<>(); 124 | } 125 | } 126 | } -------------------------------------------------------------------------------- /src/main/java/be/webtechie/ui/DashboardScreen.java: -------------------------------------------------------------------------------- 1 | package be.webtechie.ui; 2 | 3 | import be.webtechie.util.CleanExit; 4 | import be.webtechie.gpio.GpioHelper; 5 | import eu.hansolo.tilesfx.Tile.SkinType; 6 | import eu.hansolo.tilesfx.TileBuilder; 7 | import java.util.Locale; 8 | import javafx.geometry.Pos; 9 | import javafx.scene.control.Button; 10 | import javafx.scene.layout.HBox; 11 | import javafx.scene.layout.VBox; 12 | 13 | /** 14 | * The graphical user interface. 15 | */ 16 | public class DashboardScreen extends HBox { 17 | 18 | /** 19 | * Constructor. 20 | * 21 | * @param gpioHelper {@link GpioHelper} 22 | */ 23 | @SuppressWarnings("unchecked") 24 | public DashboardScreen(GpioHelper gpioHelper) { 25 | // Get the Java version info 26 | final String javaVersion = System.getProperty("java.version"); 27 | final String javaFxVersion = System.getProperty("javafx.version"); 28 | 29 | // Define our local setting (used by the clock) 30 | var locale = new Locale("nl", "be"); 31 | 32 | // Tile with the Java info 33 | var textTile = TileBuilder.create() 34 | .skinType(SkinType.TEXT) 35 | .prefSize(200, 200) 36 | .title("Version info") 37 | .description("Java: " + javaVersion + "\nJavaFX: " + javaFxVersion) 38 | .descriptionAlignment(Pos.TOP_CENTER) 39 | .textVisible(true) 40 | .build(); 41 | 42 | // Tile with a clock 43 | var clockTile = TileBuilder.create() 44 | .skinType(SkinType.CLOCK) 45 | .prefSize(200, 200) 46 | .title("Clock") 47 | .dateVisible(true) 48 | .valueVisible(false) 49 | .textVisible(false) 50 | .locale(locale) 51 | .running(true) 52 | .build(); 53 | 54 | // Tile with a switch button to turn our LED on or off 55 | var ledSwitchTile = TileBuilder.create() 56 | .skinType(SkinType.SWITCH) 57 | .prefSize(200, 200) 58 | .title("LED") 59 | .roundedCorners(false) 60 | .build(); 61 | 62 | ledSwitchTile.setOnSwitchReleased(e -> gpioHelper.setLed(ledSwitchTile.isActive())); 63 | 64 | // Tile with an exit button to end the application 65 | var exitButton = new Button("Exit"); 66 | exitButton.setOnAction(e -> CleanExit.doExit(gpioHelper.getGpioController())); 67 | 68 | var exitTile = TileBuilder.create() 69 | .skinType(SkinType.CUSTOM) 70 | .prefSize(200, 200) 71 | .title("Quit the application") 72 | .graphic(exitButton) 73 | .roundedCorners(false) 74 | .build(); 75 | 76 | // Line chart to show the distance measurement 77 | var distanceChart = TileBuilder.create() 78 | .skinType(SkinType.SMOOTHED_CHART) 79 | .prefSize(500, 280) 80 | .title("Distance measurement") 81 | //.animated(true) 82 | .smoothing(false) 83 | .series(gpioHelper.getDistanceMeasurements()) 84 | .build(); 85 | 86 | // Bar chart example which will get the button state from a thread 87 | var buttonLineChartTile = TileBuilder.create() 88 | .skinType(SkinType.SMOOTHED_CHART) 89 | .prefSize(500, 200) 90 | .title("Button state") 91 | //.animated(true) 92 | .smoothing(false) 93 | .series(gpioHelper.getButtonEvents()) 94 | .build(); 95 | 96 | var tilesColumn1 = new VBox(textTile, clockTile, ledSwitchTile, exitTile); 97 | tilesColumn1.setMinWidth(250); 98 | tilesColumn1.setSpacing(5); 99 | 100 | var tilesColumn2 = new VBox(distanceChart, buttonLineChartTile); 101 | tilesColumn2.setSpacing(5); 102 | 103 | this.getChildren().add(tilesColumn1); 104 | this.getChildren().add(tilesColumn2); 105 | } 106 | } -------------------------------------------------------------------------------- /src/main/java/be/webtechie/util/CleanExit.java: -------------------------------------------------------------------------------- 1 | package be.webtechie.util; 2 | 3 | import com.pi4j.io.gpio.GpioController; 4 | import javafx.application.Platform; 5 | 6 | /** 7 | * Helper class to nicely close the GPIO controller and JavaFX application. 8 | */ 9 | public class CleanExit { 10 | 11 | /** 12 | * Close the GPIO controller and application. 13 | * 14 | * @param gpioController {@link GpioController} 15 | */ 16 | public static void doExit(GpioController gpioController) { 17 | gpioController.shutdown(); 18 | Platform.exit(); 19 | System.exit(0); 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /src/main/java/module-info.java: -------------------------------------------------------------------------------- 1 | module be.webtechie { 2 | requires javafx.controls; 3 | requires eu.hansolo.tilesfx; 4 | requires pi4j.core; 5 | requires org.apache.logging.log4j; 6 | exports be.webtechie; 7 | } -------------------------------------------------------------------------------- /src/main/resources/log4j2.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | --------------------------------------------------------------------------------