3. Button and LED

Objective

The goal is to turn the LED on when a button is pressed. While the button is being held down, the LED is on. When the button is released, the LED is off.

Wiring

Follow the circuit diagram provided to wire the Metro M0 Express.

Coding/Programming

import board

from digitalio import DigitalInOut, Direction, Pull

import time

led = DigitalInOut(__________ )

button = DigitalInOut(__________ )

led.direction = Direction.__________

button.direction = Direction.__________

button.pull = Pull.UP # Pull: defines the pull of a digital input pin

buttonState = False

while True:

buttonState = button.value

if buttonState:

# button is pressed and led is currently on

led.value = __________

else:

# button is pressed and led is currently off

led.value = __________

time.sleep(0.01)