from machine import Pin
import time

boton_cruce = Pin(22, Pin.IN, Pin.PULL_DOWN)   
boton_reset = Pin(21, Pin.IN, Pin.PULL_DOWN)   

led_rojo     = Pin(0, Pin.OUT)  
led_amarillo = Pin(1, Pin.OUT)  
led_verde    = Pin(2, Pin.OUT)  
led_peaton   = Pin(3, Pin.OUT)  

estado = 0   

while True:
    if boton_cruce.value() == 1:
        estado = 1
        time.sleep(0.2)   

    if boton_reset.value() == 1:
        estado = 0
        time.sleep(0.2)   

    if estado == 0:
        led_rojo.off()
        led_amarillo.off()
        led_verde.on()
        led_peaton.off()
    elif estado == 1:
        led_rojo.on()
        led_amarillo.off()
        led_verde.off()
        led_peaton.on()