from machine import Pin, PWM, ADC
import utime

led_pwm = PWM(Pin(0))
led_pwm.freq(1000)

potentiometer = ADC(Pin(28))

while True:
    adc_value = potentiometer.read_u16()
    led_pwm.duty_u16(adc_value)
    print(adc_value)
    utime.sleep(0.2)