import org.firmata4j.IODevice; import org.firmata4j.Pin; import org.firmata4j.firmata.FirmataDevice; import org.firmata4j.ssd1306.SSD1306; import java.util.Timer; import java.io.IOException; import java.util.HashMap; import java.util.TimerTask; public class task extends TimerTask { private final Pin moisturesensor; private final SSD1306 OLEDscreen; private final Pin Waterpump; private boolean lastMoistureState = false; // Track previous moisture state task(Pin sensor, SSD1306 screen, Pin pump) { this.moisturesensor = sensor; this.OLEDscreen = screen; this.Waterpump = pump; } @Override public void run(){ String valueString = String.valueOf(moisturesensor.getValue()); boolean currentMoistureState = moisturesensor.getValue() > 600; if (currentMoistureState != lastMoistureState) { OLEDscreen.getCanvas().clear(); if (currentMoistureState) { try { Waterpump.setValue(1); } catch (IOException e) { throw new RuntimeException(e); } OLEDscreen.getCanvas().drawString(0, 15, "DRY WATER MORE"); OLEDscreen.getCanvas().drawString(0, 26, "PUMPING WATER"); System.out.println("Soil is dry and needs more water"); } else { try { Waterpump.setValue(0); } catch (IOException e) { throw new RuntimeException(e); } OLEDscreen.getCanvas().drawString(0, 15, "WET, NO MORE NEEDED"); OLEDscreen.getCanvas().drawString(0, 26, "STOP THE PUMPING"); System.out.println("Soil is WET AND NEEDS NO MORE WATER"); } OLEDscreen.display(); lastMoistureState = currentMoistureState; } } }--- import StdDraw.StopButton; import org.firmata4j.IODevice; import org.firmata4j.Pin; import org.firmata4j.firmata.FirmataDevice; import org.firmata4j.ssd1306.SSD1306; import java.util.Timer; import java.io.IOException; import java.util.HashMap; import java.util.TimerTask; public class minorproj { private static Object timerObject; public static void main(String[] args) throws IOException, InterruptedException { String portID = "/dev/cu.usbserial-0001"; IODevice arduinoObject = new FirmataDevice(portID); arduinoObject.start(); arduinoObject.ensureInitializationIsDone(); var i2cObject = arduinoObject.getI2CDevice((byte) 0x3C); SSD1306 OLED = new SSD1306(i2cObject, SSD1306.Size.SSD1306_128_64); OLED.init(); var moistureSensor = arduinoObject.getPin(16); moistureSensor.setMode(Pin.Mode.ANALOG); var buttonPin = arduinoObject.getPin(6); // Button pin on D6 buttonPin.setMode(Pin.Mode.INPUT); var stopButton = new StopButton(buttonPin, timerObject); // Create a StopButton instance var waterPump = arduinoObject.getPin(7); waterPump.setMode(Pin.Mode.OUTPUT); var Task = new task(moistureSensor, OLED, waterPump); Timer timerObject = new Timer(); timerObject.schedule(Task, 0, 1000); } for this entire code, just ADD a part where pressing the button will END THE ENTRE CODE. the button pin is D6.