from machine import Pin
from utime import sleep

# Set up the LED and button
led = Pin(2, Pin.OUT)
pb = Pin(20, Pin.IN, Pin.PULL_UP)

# Main loop
while True:
    if pb.value() == 0:   # Button is pressed
        led.on()
    else:                 # Button is not pressed
        led.off()
    sleep(0.1)            # Small delay to debounce the button