from machine import Pin, PWM
from time import sleep

motion = False

pwm = PWM(Pin(20))
pwm.freq(50)

def handle_interrupt(pin):
  global motion
  motion = True
  global interrupt_pin
  interrupt_pin = pin 


pir = Pin(22, Pin.IN)

pir.irq(trigger=Pin.IRQ_RISING, handler=handle_interrupt)

while True:
  if motion:
    print('Motion detected!')
    
    for position in range(1000,9000,50):
        pwm.duty_u16(position)
        sleep(0.01)
    for position in range(9000,1000,-50):
        pwm.duty_u16(position)
        sleep(0.01)

    motion = False