import time
time.sleep(0.1) # Wait for USB to become ready

import machine
from utime import sleep

s0 = machine.Pin(27, machine.Pin.OUT)
mux_in = machine.Pin(26, machine.Pin.IN, machine.Pin.PULL_DOWN)

while True:
    for selector_val in range(2):
        s0.value(selector_val)
        print(f'input: {mux_in.value()}')
        sleep(1)