from machine import Pin, ADC
from utime import sleep

LED_green = Pin(15, Pin.OUT)
LED_yellow = Pin(14, Pin.OUT)
LED_red = Pin(13, Pin.OUT)

POT = ADC(26) 

while True:
  valor = POT.read_u16() #Valor de 0 a 65535
  if valor >= 0 and valor <= 19660:
    LED_yellow.off()
    LED_red.off()
    sleep(0.5)
    LED_green.on()
  elif valor >= 19661 and valor <= 39321:
    LED_green.off()
    LED_red.off()
    sleep(0.5)    
    LED_yellow.on()
  elif valor >= 39322 and valor <= 65535:
    LED_green.off()
    LED_yellow.off()
    sleep(0.5)
    LED_red.on()