from machine import Pin, Timer, ADC
import utime
# import machine
# led = Pin(25, Pin.OUT)

freqValue = 1
dutyCyc = 20  # percent
on_start = 0

led = Pin("LED", Pin.OUT)
adc = ADC(Pin(26))     # create ADC object on ADC pin

timer = Timer()
CountDown = Timer()
button = Pin(11, Pin.IN, Pin.PULL_DOWN)
led.on()
delta = 0
onTIMEms = 1000

def blink(on_start):
#  if 1: #button.value():
    #if True:
   led.toggle()
   if led():
       on_start = 1
       print("on_start is",on_start)
       
timer.init(freq=freqValue, mode=Timer.PERIODIC, callback=blink(on_start))

while 1:
   if on_start:
     on_start = 0
     print("Duty Cycle is",dutyCyc)
     onTIMEms = ((dutyCyc*10)/freqValue)
     startms = utime.ticks_ms() # get millisecond counter


   delta = utime.ticks_diff(time.ticks_ms(), startms) # compute time difference
   
   if (delta >= onTIMEms):
     led.off()
  
#   adc.read_u16()         # read value, 0-65535 across voltage range 0.0v - 3.3v