from utime import sleep
sleep(0.5)
print("Hello, Pi Pico!")
from machine import ADC,Pin 

led=Pin(4,Pin.OUT)
pot=ADC(Pin(26))

while 1:
    val=pot.read_u16()
    delay=0.2+val*(1.8)/65535
    print(delay,"sec")
    led.value(0)
    sleep(delay)
    led.value(1)
    sleep(delay)