from machine import Pin, ADC
import time

time.sleep(0.1)  # wait for USB to be ready

LED = Pin(14, Pin.OUT)  # <-- Pin(), no solo (14, Pin.OUT)
pot = ADC(26)
print("Lectura analogica")

while True:
    lectura = pot.read_u16()
    voltaje = (lectura / 65535) * 3.3
    print(f"{lectura} | Voltaje: {voltaje:.2f} V")

    if voltaje < 2.0:        # <-- if DENTRO del while
        LED.value(1)
        time.sleep(0.1)
    else:
        LED.value(1)
        time.sleep(0.2)
        LED.value(0)
        time.sleep(0.2)