from machine import Pin,PWM
import time

# Setup pins
trigger = Pin(4, Pin.OUT)
echo = Pin(3, Pin.IN)
buzzer = PWM(Pin(8))

def measure_distance():
    # Trigger a new measurement
    trigger.value(1)
    time.sleep_us(10)
    trigger.value(0)

    
    while echo.value() == 0:
        pass

    start_time = time.ticks_us()


    while echo.value() == 1:
        pass

    end_time = time.ticks_us()

    # Calculate the duration in microseconds
    duration = time.ticks_diff(end_time, start_time)

    # Calculate distance in centimeters
    distance_room = duration / 58.0

    return distance_room

while True:
    distance_room = measure_distance()
    print("Distance in room:", distance_room)
    

    if distance_room < 500:
        print("Theaf detected not safe,locker is taken awayfrom room ")
        buzzer.freq(500)  
        buzzer.duty_u16(49152) 
    else:
        print("safet")
        buzzer.duty_u16(5)
    time.sleep(1)