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

pot = ADC(26)
led = Pin(15, Pin.IN, Pin.PULL_UP)
led_pwm = PWM(led)
led_pwm.freq(1000)


while True:
    pot_val = pot.read_u16()
    led_pwm.duty_u16(pot_val)
    sleep(0.1)