from utime import sleep
sleep(0.1) # Wait for USB to become ready

from machine import ADC, Pin,PWM
pot_d = ADC(Pin(26))  # create ADC object on ADC pin
pot_c = ADC(Pin(27))  # create ADC object on ADC pin
led = PWM(Pin(0),freq=2000)
while 1:
    value_d=pot_d.read_u16()
    delay=0.1+1.9*(value_d/65535.0)
    value_c=pot_c.read_u16()    
    print("delay value is",delay)
    print("contrast value is",value_c)
    led.duty_u16(value_c)
    sleep(delay/2)
    led.duty_u16(0)
    sleep(delay/2)