from machine import Pin, Timer, PWM

led1 = Pin('GP19', Pin.OUT) # Create input and output Pin objects
led2 = Pin('GP18', Pin.OUT)
btn1 = Pin('GP17', Pin.IN, Pin.PULL_DOWN) # Pin.PULL_DOWN enables internal pull-down
btn2 = Pin('GP16', Pin.IN, Pin.PULL_DOWN) # resistors for the inputs.

def checkButtons(timer): # Callback function
    led1.value(btn1.value()) # Light LED1 if button 1 is pressed
    led2.value(btn2.value()) # Light LED2 if button 2 is pressed
# Set up a timer to trigger every 50 ms
tmr = Timer(period = 50, callback = checkButtons)