from machine import Pin
import time

red = Pin(2, Pin.OUT)
yellow = Pin(3, Pin.OUT)
green = Pin(4, Pin.OUT)

sw_r = Pin(6, Pin.IN)
sw_y = Pin(7, Pin.IN)
sw_g = Pin(8, Pin.IN)

while True:
    red.value(sw_r.value())
    yellow.value(sw_y.value())
    green.value(sw_g.value())
    time.sleep(0.1)