Java物联网硬件开发教程：实现智能门锁功能

import com.pi4j.io.gpio.*;
import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent;
import com.pi4j.io.gpio.event.GpioPinListenerDigital;

import java.util.concurrent.TimeUnit;

public class SmartLock {

    private static final GpioController gpio = GpioFactory.getInstance();
    private static final GpioPinDigitalOutput lockPin = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_01, "Lock");

    public static void main(String[] args) throws InterruptedException {
        lockPin.setShutdownOptions(true, PinState.LOW);

        lockPin.addListener((GpioPinListenerDigital) event -> {
            if (event.getState() == PinState.LOW) {
                System.out.println("Door is locked.");
            } else {
                System.out.println("Door is unlocked.");
            }
        });

        unlockDoorForAWhile(5000);
    }

    private static void unlockDoorForAWhile(long durationMillis) throws InterruptedException {
        lockPin.low();
        TimeUnit.MILLISECONDS.sleep(durationMillis);
        lockPin.high();
    }

}