45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
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import RPi.GPIO as GPIO
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import time, logging
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from threading import Thread, Event
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from itertools import chain
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logger = logging.getLogger(__name__)
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class Blinkenlights(Thread):
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def __init__(self, pin, cyclePeriod=2):
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self._stopper = Event()
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self._pin = pin
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self.blink = False
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self.setCyclePeriod(cyclePeriod) #cyclePeriod is length of one blink cycle in seconds
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GPIO.setup(pin, GPIO.OUT)
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pwm = GPIO.PWM(self._pin, 60)
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def blinkLights():
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pwm.start(0)
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while not self._stopper.isSet():
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t = self._sleeptime
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if self.blink:
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for dc in chain(range(100, -1, -5), range(0, 101, 5)):
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pwm.ChangeDutyCycle(dc)
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time.sleep(t)
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else:
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pwm.ChangeDutyCycle(100)
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time.sleep(t)
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pwm.stop() # required to avoid core dumps when process terminates
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super().__init__(target=blinkLights, daemon=True)
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self.start()
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logger.debug('Starting LED on pin %s', self._pin)
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def setCyclePeriod(self, cyclePeriod):
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self._sleeptime = cyclePeriod/20/2
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def stop(self):
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self._stopper.set()
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logger.debug('Stopping LED on pin %s', self._pin)
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def __del__(self):
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self.stop()
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