from machine import Pin, PWM
import time

calibrationTime = 5
lowIn = 0
pause = 5000

lockLow = True
takeLowTime = False

pirPin = Pin(2, Pin.IN)
ledPin = Pin(4, Pin.OUT)
buzzer = PWM(Pin(5))
buzzer.freq(1000)

def setup():
    print("calibrating sensor ", end="")
    for i in range(calibrationTime):
        print(".", end="")
        time.sleep(1)
    print(" done")
    print("SENSOR ACTIVE")
    time.sleep(0.05)

# Initialize the global variables here
setup()
while True:
    if pirPin.value() == 1:
        ledPin.on()
        buzzer.duty(512)
        if lockLow:
            lockLow = False
            print("---")
            print("motion detected at", time.ticks_ms() // 1000, "sec")
            time.sleep(0.05)
        takeLowTime = True

    if pirPin.value() == 0:
        ledPin.off()
        buzzer.duty(0)
        if takeLowTime:
            lowIn = time.ticks_ms()
            takeLowTime = False
        if not lockLow and time.ticks_ms() - lowIn > pause:
            lockLow = True
            print("motion ended at", (time.ticks_ms() - pause) // 1000, "sec")
            time.sleep(0.05)