SequentMicrosystems_API/scripts/speed_reader.py

from src.variables.service import get_variable, set_variable
from gpiozero import Button
import datetime

from scripts.speed_controller import rpm_control

pulses_per_rotation = 1
reader = Button(4, pull_up=False, bounce_time=0.0005)
set_variable("speed_reader_last_impulse_time", datetime.datetime.now(), False)

rpm_last = 0

def event():
    actual = datetime.datetime.now()
    last = get_variable("speed_reader_last_impulse_time")
    difference = (actual - last).total_seconds()
    set_variable("speed_reader_last_impulse_time", actual, False)

    rpm = (60 / difference) / pulses_per_rotation
    
    actual_rpm = (rpm_last + rpm) / 2
    rpm_last = rpm

    set_variable("actual_rpm", round(actual_rpm, 1), False)
    rpm_control()
    




reader.when_pressed = event