// START SNIPPET: control-gpio-snippet
/*
* #%L
* **********************************************************************
* ORGANIZATION : Pi4J
* PROJECT : Pi4J :: Java Examples
* FILENAME : ControlGpioExample.java
*
* This file is part of the Pi4J project. More information about
* this project can be found here: http://www.pi4j.com/
* **********************************************************************
* %%
* Copyright (C) 2012 - 2013 Pi4J
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.RaspiPin;
/**
* This example code demonstrates how to perform simple state
* control of a GPIO pin on the Raspberry Pi.
*
* @author Robert Savage
*/
public class ControlGpioExample {
public static void main(String[] args) throws InterruptedException {
System.out.println("<--Pi4J--> GPIO Control Example ... started.");
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// provision gpio pin #01 as an output pin and turn on
final GpioPinDigitalOutput pin = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_01, "MyLED", PinState.HIGH);
System.out.println("--> GPIO state should be: ON");
Thread.sleep(5000);
// turn off gpio pin #01
pin.low();
System.out.println("--> GPIO state should be: OFF");
Thread.sleep(5000);
// toggle the current state of gpio pin #01 (should turn on)
pin.toggle();
System.out.println("--> GPIO state should be: ON");
Thread.sleep(5000);
// toggle the current state of gpio pin #01 (should turn off)
pin.toggle();
System.out.println("--> GPIO state should be: OFF");
Thread.sleep(5000);
// turn on gpio pin #01 for 1 second and then off
System.out.println("--> GPIO state should be: ON for only 1 second");
pin.pulse(1000, true); // set second argument to 'true' use a blocking call
// stop all GPIO activity/threads by shutting down the GPIO controller
// (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
gpio.shutdown();
}
}
//END SNIPPET: control-gpio-snippet