Package com.diozero.devices

Class PwmLed

java.lang.Object

com.diozero.api.GpioDevice

com.diozero.api.PwmOutputDevice

com.diozero.devices.PwmLed

All Implemented Interfaces:

OutputDeviceInterface, java.io.Closeable, java.lang.AutoCloseable

public class PwmLed
extends PwmOutputDevice

PWM controlled LED. @see com.diozero.sampleapps.PwmLedTest PwmLedTest

Field Summary

Fields inherited from class com.diozero.api.PwmOutputDevice

INFINITE_ITERATIONS

Fields inherited from class com.diozero.api.GpioDevice

gpio

Constructor Summary

Constructors

Constructor	Description
PwmLed(int gpio)
PwmLed(int gpio, float initialValue)
PwmLed(PwmOutputDeviceFactoryInterface deviceFactory, int gpio)
PwmLed(PwmOutputDeviceFactoryInterface deviceFactory, int gpio, float initialValue)

Method Summary

Modifier and Type	Method	Description
void	blink()	Blink the LED on and off indefinitely.
void	blink(float onTime, float offTime, int iterations, boolean background)	Blink the LED on and off repeatedly.
boolean	isLit()	Return true if the PWM value is >0.
void	pulse()	Pulse the LED on and off indefinitely in a background thread with a fade time of 1 second.
void	pulse(float fadeTime, int steps, int iterations, boolean background)	Pulse the LED on and off repeatedly.

Methods inherited from class com.diozero.api.PwmOutputDevice

close, fadeInOutLoop, getValue, isOn, off, on, onOffLoop, setValue, setValueInternal, toggle

Methods inherited from class com.diozero.api.GpioDevice

getGpio

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PwmLed

public PwmLed(int gpio) throws RuntimeIOException

Parameters:

gpio - The GPIO to which the LED is attached to.

Throws:

RuntimeIOException - If an I/O error occurred.

PwmLed

public PwmLed(int gpio, float initialValue) throws RuntimeIOException

Parameters:

gpio - The GPIO to which the LED is attached to.

initialValue - Initial PWM output value (range 0..1).

Throws:

RuntimeIOException - If an I/O error occurred.

PwmLed

public PwmLed(PwmOutputDeviceFactoryInterface deviceFactory, int gpio) throws RuntimeIOException

Parameters:

deviceFactory - Device factory to use to provision this device.

gpio - The GPIO to which the LED is attached to.

Throws:

RuntimeIOException - If an I/O error occurred.

PwmLed

public PwmLed(PwmOutputDeviceFactoryInterface deviceFactory, int gpio, float initialValue) throws RuntimeIOException

Parameters:

deviceFactory - Device factory to use to provision this device.

gpio - The GPIO to which the LED is attached to.

initialValue - Initial PWM output value (range 0..1).

Throws:

RuntimeIOException - If an I/O error occurred.

Method Details

blink

public void blink() throws RuntimeIOException

Blink the LED on and off indefinitely.

Throws:

RuntimeIOException - If an I/O error occurred.

blink

public void blink(float onTime, float offTime, int iterations, boolean background) throws RuntimeIOException

Blink the LED on and off repeatedly.

Parameters:

onTime - On time in seconds.

offTime - Off time in seconds.

iterations - Number of iterations. Set to <0 to blink indefinitely.

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.

pulse

public void pulse() throws RuntimeIOException

Pulse the LED on and off indefinitely in a background thread with a fade time of 1 second.

Throws:

RuntimeIOException - If an I/O error occurred.

pulse

public void pulse(float fadeTime, int steps, int iterations, boolean background) throws RuntimeIOException

Pulse the LED on and off repeatedly.

Parameters:

fadeTime - Time in seconds from fully on to fully off.

steps - Number of steps between fully on to fully off.

iterations - Number of times to fade in and out.

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.

isLit

public boolean isLit() throws RuntimeIOException

Return true if the PWM value is >0.

Returns:

True if >0, false if 0.

Throws:

RuntimeIOException - If an I/O error occurred.