import time
import machine
from machine import Pin, ADC, PWM
from machine import Timer
from time import ticks_ms, ticks_diff
LED=PWM(Pin(4))
LED.freq(1000)
LED.duty_u16(65535)
def fun(Pin):
  print("periodic")
  LED.duty_u16(65535)
t=Timer(period=5000, mode=Timer.PERIODIC, callback=fun)
S1=Pin(0, Pin.IN)
last_tick=0;
time.sleep(0.1)

def h(Pin):
  global last_tick
  curr_time=ticks_ms()
  if ticks_diff(curr_time, last_tick) < 200: 
    #print("error")
    return
  last_tick=curr_time
  LED.duty_u16(0)
  print("rising")
S1.irq(trigger=Pin.IRQ_RISING,handler=h)


print("Hello, Pi Pico!")