from machine import Pin,ADC,PWM
import utime

pot=ADC(1)     #Pin26=ADC(0), Pin27=ADC(1), Pin28=ADC(2)
led=Pin(14, Pin.OUT)
Sal_analogica=PWM(led)
Sal_analogica.freq(1000) # 1000 hz

while 1:
  duty=pot.read_u16()    #0 .....65535
  Sal_analogica.duty_u16(duty)
  print(duty)
  utime.sleep(.5)