from machine import ADC, Pin
from time import sleep

pot_pin = ADC(26)

red_led_pin = Pin(16, Pin.OUT)
green_led_pin = Pin(17, Pin.OUT)

while True:

    pot_value = pot_pin.read_u16()
    percentage = (pot_value / 65535) * 100

    print("Voltage % = {:.2f}".format(percentage))

    if percentage > 30:
        green_led_pin.value(1)
        red_led_pin.value(0)
    else:
        green_led_pin.value(0)
        red_led_pin.value(1)
    sleep(0.2)