RaspberryPi - HC-SR501(PIR 동작 검지 센서)

출처 : rpi_HC-SR501/src/main/java/org/jboss/summit2015/hcsr501/MotionSensor.java

pi4j 다운로드

$ mkdir pi4j
$ cd pi4j
$ wget http://get.pi4j.com/download/pi4j-1.0.zip
--2016-07-09 16:59:31--  http://get.pi4j.com/download/pi4j-1.0.zip
Resolving get.pi4j.com (get.pi4j.com)... 54.231.114.185
Connecting to get.pi4j.com (get.pi4j.com)|54.231.114.185|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3807428 (3.6M) [application/zip]
Saving to: ‘pi4j-1.0.zip.1’
 
pi4j-1.0.zip.1      100%[=====================>]   3.63M   544KB/s   in 6.4s   
 
2016-07-09 16:59:38 (581 KB/s) - ‘pi4j-1.0.zip.1’ saved [3807428/3807428]
 
$ unzip pi4j-1.0.zip 

핀 배치

MotionSensor.java

import com.pi4j.io.gpio.*;
import com.pi4j.io.gpio.trigger.GpioCallbackTrigger;

import java.util.concurrent.Callable;

/**
 * Use the pi4j classes to watch a gpio trigger. This uses the pin number scheme as outlined in:
 * http://pi4j.com/pins/model-2b-rev1.html
 */
public class MotionSensor {
    public static void main(String[] args) throws InterruptedException {

        System.out.printf("PIR Module Test (CTRL+C to exit)\n");

        // create gpio controller
        final GpioController gpio = GpioFactory.getInstance();
        // provision gpio pin #29, (header pin 40) as an input pin with its internal pull down resistor enabled
        final GpioPinDigitalInput pir = gpio.provisionDigitalInputPin(RaspiPin.GPIO_29);
        System.out.printf("Ready\n");

        // create a gpio callback trigger on the gpio pin
        Callable<Void> callback = () -> {
            System.out.println(" --> GPIO TRIGGER CALLBACK RECEIVED ");
            return null;
        };
        // create a gpio callback trigger on the PIR device pin for when it's state goes high
        pir.addTrigger(new GpioCallbackTrigger(PinState.HIGH, callback));

        // stop all GPIO activity/threads by shutting down the GPIO controller
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                System.out.println("Interrupted, stopping...\n");
                gpio.shutdown();
            }
        });

        // keep program running until user aborts (CTRL-C)
        for (;;) {
            Thread.sleep(100);
        }

    }
}

컴파일

$ javac -cp pi4j-1.0/lib/pi4j-core.jar MotionSensor.java 

실행

$ sudo java -cp .:pi4j-1.0/lib/pi4j-core.jar MotionSensor
PIR Module Test (CTRL+C to exit)
Ready
 --> GPIO TRIGGER CALLBACK RECEIVED 
 --> GPIO TRIGGER CALLBACK RECEIVED 
^CInterrupted, stopping...

GPIO 핀 배열