from machine import Pin, ADC
from time import sleep, ticks_us, ticks_diff
from picozero import Speaker

switch = Pin(18, Pin.IN)
pot = ADC(27)
pir = Pin(15, Pin.OUT)

echo = Pin(12, Pin.IN)
trig = Pin(13, Pin.OUT)

buzzer = Speaker(16)

while True:
    trig.low()
    sleep(0.002)
    trig.high()
    sleep(0.00001)
    trig.low()
    while echo.value() == 0:
        start = ticks_us()
    while echo.value() == 1:
        end = ticks_us()
    duracao = ticks_diff(end, start)
    distancia = (duracao * 0.0343) / 2

    print(switch.value(), pot.read_u16(), pir.value(), distancia)

    tempo = distancia ** 1.35 / 1000
    if distancia < 100 and pir.value() == 1 and switch.value() == 1:
        if tempo < 0.04:
            buzzer.on()
        else:
            buzzer.on()
            sleep(tempo)
            buzzer.off()
            sleep(tempo)
    else:
        buzzer.off()
    sleep(1)