from machine import Pin ,PWM
import time

trigger = Pin(3, Pin.OUT)
echo = Pin(2, Pin.IN)

buzzer_pin = Pin(8, Pin.OUT)
buzzer = PWM(buzzer_pin)

def ultra():
    trigger.low()
    time.sleep_us(2)
    trigger.high()
    time.sleep_us(5)
    trigger.low()
    while echo.value() == 0:
       signaloff = time.ticks_us()
    while echo.value() == 1:
       signalon = time.ticks_us()

       timepassed = signalon - signaloff
    distance = (timepassed * 0.0343) / 2
    print("Mesafe : ",distance,"cm")

    return distance
while True:
    mesafe = int(ultra())

    if mesafe < 350 :
        buzzer.freq(4200 - mesafe *10)
        buzzer.duty_u16(3000)
        time.sleep(mesafe/1000)
        buzzer.duty_u16(0)
        buzzer.deinit()
        time.sleep(mesafe/1500)
    else:
        pass
   #time.sleep(1)



"""
while True :
    for i in range(100,1000,10):
        buzzer.freq(i)
        print("Ses",i)
        buzzer.duty_u16(3000)
        time.sleep(0.1)
        buzzer.duty_u16(0)
        buzzer.deinit()
        time.sleep(0.1)

"""