from machine import Pin,ADC
from utime import sleep

pot=ADC(Pin(26))
led=Pin(0,Pin.OUT)

while 1:
    potval=pot.read_u16()
    time=potval/65535*1.9+0.1
    print("pot value is",potval,time)
    led.value(0)
    sleep(time)
    led.value(1)
    sleep(time)
    print("led on")