from machine import Pin, ADC
from utime import sleep, sleep_ms

sensor = ADC(Pin(17))
rojo = Pin(35, Pin.OUT)
verde = Pin(36, Pin.OUT)

while True:
    dato = sensor.read_u16()
    valor = (dato * 100000)/65535
    print("Res: ", dato,"PPM: ", valor)
    sleep_ms(50)
    if valor >= 60000:
      rojo.on()
      verde.off()
    else:
      rojo.off()
      verde.on()