com.diozero.devices.LED Maven / Gradle / Ivy
package com.diozero.devices;
/*-
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: LED.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import com.diozero.api.DigitalOutputDevice;
import com.diozero.api.PinInfo;
import com.diozero.api.RuntimeIOException;
import com.diozero.api.function.Action;
import com.diozero.internal.spi.GpioDeviceFactoryInterface;
import com.diozero.sbc.DeviceFactoryHelper;
/**
*
* Provides utility methods for controlling a Light Emitting Diode (LED).
* Connect the cathode (short leg, flat side) of the LED to a ground pin;
* connect the anode (longer leg) to a limiting resistor; connect the other side
* of the limiting resistor to a GPIO pin (the limiting resistor can be placed
* either side of the LED). Example LED control, taken from LEDTest:
*
*
*
* {@code
*try (LED led = new LED(pin)) {
* led.on();
* SleepUtil.sleepSeconds(.5);
* led.off();
* SleepUtil.sleepSeconds(.5);
* led.toggle();
* SleepUtil.sleepSeconds(.5);
* led.toggle();
* SleepUtil.sleepSeconds(.5);
* led.blink(0.5f, 0.5f, 10, false);
*}}
*
*/
public class LED extends DigitalOutputDevice {
/**
* @param pinInfo GPIO to which the LED is connected.
* @param activeHigh Set to true if a high output value represents on.
* @param initialValue Initial value.
* @throws RuntimeIOException If an I/O error occurred.
*/
public LED(PinInfo pinInfo, boolean activeHigh, boolean initialValue) throws RuntimeIOException {
super(DeviceFactoryHelper.getNativeDeviceFactory(), pinInfo, activeHigh, initialValue);
}
/**
* @param gpio GPIO to which the LED is connected.
* @throws RuntimeIOException If an I/O error occurred.
*/
public LED(int gpio) throws RuntimeIOException {
super(gpio);
}
/**
* @param gpio GPIO to which the LED is connected.
* @param activeHigh Set to true if a high output value represents on.
* @throws RuntimeIOException If an I/O error occurred.
*/
public LED(int gpio, boolean activeHigh) throws RuntimeIOException {
super(gpio, activeHigh, !activeHigh);
}
/**
* @param deviceFactory Device factory to use to construct the device.
* @param gpio GPIO to which the LED is connected.
* @throws RuntimeIOException If an I/O error occurred.
*/
public LED(GpioDeviceFactoryInterface deviceFactory, int gpio) throws RuntimeIOException {
super(deviceFactory, gpio, true, false);
}
/**
* @param deviceFactory Device factory to use to construct the device.
* @param gpio GPIO to which the LED is connected.
* @param activeHigh Set to true if a high output value represents on.
* @param initialValue Initial value.
* @throws RuntimeIOException If an I/O error occurred.
*/
public LED(GpioDeviceFactoryInterface deviceFactory, int gpio, boolean activeHigh, boolean initialValue) {
super(deviceFactory, gpio, activeHigh, initialValue);
}
/**
* Blink indefinitely with 1 second on and 1 second off.
*
* @throws RuntimeIOException If an I/O error occurred.
*/
public void blink() throws RuntimeIOException {
blink(1, 1, INFINITE_ITERATIONS, true, null);
}
/**
* Blink indefinitely with 1 second on and 1 second off.
*
* @param stopAction Action to invoke when the animation stops.
* @throws RuntimeIOException If an I/O error occurred.
*/
public void blink(Action stopAction) throws RuntimeIOException {
blink(1, 1, INFINITE_ITERATIONS, true, stopAction);
}
/**
* Blink.
*
* @param onTime On time in seconds.
* @param offTime Off time in seconds.
* @param n Number of iterations. Set to <0 to blink indefinitely.
* @param background If true start a background thread to control the blink and
* return immediately. If false, only return once the blink
* iterations have finished.
* @throws RuntimeIOException If an I/O error occurred.
*/
public void blink(float onTime, float offTime, int n, boolean background) throws RuntimeIOException {
blink(onTime, offTime, n, background, null);
}
/**
* Blink.
*
* @param onTime On time in seconds.
* @param offTime Off time in seconds.
* @param n Number of iterations. Set to <0 to blink indefinitely.
* @param background If true start a background thread to control the blink and
* return immediately. If false, only return once the blink
* iterations have finished.
* @param stopAction Action to invoke when the animation stops.
* @throws RuntimeIOException If an I/O error occurred.
*/
public void blink(float onTime, float offTime, int n, boolean background, Action stopAction)
throws RuntimeIOException {
onOffLoop(onTime, offTime, n, background, stopAction);
}
/**
* Return true if the LED is currently on.
*
* @return True if the LED is on, false if off.
* @throws RuntimeIOException If an I/O error occurred.
*/
public boolean isLit() throws RuntimeIOException {
return isOn();
}
}