from machine import Pin
from time import sleep

red_led = Pin(2, Pin.OUT)

switch = Pin(4, Pin.IN)

while True:
    switch_state = switch.value()
    print("Switch State =", switch_state)

    if switch_state==1:
        red_led.value(1)

    else:
        red_led.value(0)

    sleep(0.1)