State machine example for ME 30 at Tufts

state-machine.py

import board
import digitalio as dio
import time

led = dio.DigitalInOut(board.LED)
led.direction = dio.Direction.OUTPUT

button = dio.DigitalInOut(board.D6)
button.direction = dio.Direction.INPUT

other_led = dio.DigitalInOut(board.D5)
other_led.direction = dio.Direction.OUTPUT

STATE_TOGGLE = 1
STATE_CHECK_BUTTON = 2

state = STATE_TOGGLE
next_toggle = 0
led.value = False

while True:
    if state is STATE_TOGGLE:
        if led.value is True:
            led.value = False
        else:
            led.value = True
        next_toggle = time.monotonic() + 1.0
        state = STATE_CHECK_BUTTON
    elif state is STATE_CHECK_BUTTON:
        if button.value is True:
            other_led.value = True
        else:
            other_led.value = False
        if time.monotonic() > next_toggle:
            state = STATE_TOGGLE