32 lines
959 B
Python
32 lines
959 B
Python
from src.variables.service import get_variable, set_variable
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from gpiozero import Button
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import datetime, os
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pulses_per_rotation = 4
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reader = Button(4, pull_up=False, bounce_time=0.0005)
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set_variable("speed_reader_last_impulse_time", datetime.datetime.now(), False)
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set_variable("actual_rpm_unfiltered", 0, False)
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def printer(text):
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if bool(os.getenv("DEBUG")):
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print(text)
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def event():
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actual = datetime.datetime.now()
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last = get_variable("speed_reader_last_impulse_time")
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difference = (actual - last).total_seconds()
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set_variable("speed_reader_last_impulse_time", actual, False)
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rpm = (60 / difference) / pulses_per_rotation
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actual_rpm = (float(get_variable("actual_rpm_unfiltered")) + rpm) / 2
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set_variable("actual_rpm_unfiltered", rpm, False)
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set_variable("actual_rpm", round(actual_rpm, 1), False)
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printer("Measured RPM: {}".format(round(actual_rpm, 1)))
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reader.when_pressed = event
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