mirror of
https://github.com/pimoroni/grow-python
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72 lines
1.8 KiB
Python
72 lines
1.8 KiB
Python
__version__ = '0.0.2'
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import time
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import atexit
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import threading
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import RPi.GPIO as GPIO
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class Piezo():
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def __init__(self, gpio_pin=13):
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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GPIO.setup(gpio_pin, GPIO.OUT, initial=GPIO.LOW)
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self.pwm = GPIO.PWM(gpio_pin, 440)
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self.pwm.start(0)
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self._timeout = None
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atexit.register(self._exit)
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def frequency(self, value):
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"""Change the piezo frequency.
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Loosely corresponds to musical pitch, if you suspend disbelief.
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"""
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self.pwm.ChangeFrequency(value)
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def start(self, frequency=None):
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"""Start the piezo.
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Sets the Duty Cycle to 100%
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"""
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if frequency is not None:
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self.frequency(frequency)
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self.pwm.ChangeDutyCycle(1)
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def stop(self):
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"""Stop the piezo.
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Sets the Duty Cycle to 0%
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"""
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self.pwm.ChangeDutyCycle(0)
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def beep(self, frequency=440, timeout=0.1, blocking=True, force=False):
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"""Beep the piezo for time seconds.
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:param freq: Frequency, in hertz, of the piezo
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:param timeout: Time, in seconds, of the piezo beep
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:param blocking: If true, function will block until piezo has stopped
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"""
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if blocking:
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self.start(frequency=frequency)
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time.sleep(timeout)
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self.stop()
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return True
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else:
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if self._timeout is not None:
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if self._timeout.is_alive():
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if force:
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self._timeout.cancel()
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else:
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return False
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self._timeout = threading.Timer(timeout, self.stop)
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self.start(frequency=frequency)
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self._timeout.start()
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return True
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def _exit(self):
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self.pwm.stop()
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