from machine import Pin, PWM
import utime

trig=Pin(0,Pin.OUT)
echo=Pin(1,Pin.IN)
ledR=Pin(2,Pin.OUT)
buzzer= PWM(Pin(3))
buzzer.freq(2000)

Ton=Toff= t= distance= 0
interval=0

def ultrason():
    trig.off()
    trig.on()
    utime.sleep_us(10)
    trig.off()
    while echo.value()==0:
        Toff= utime.ticks_us()
    while echo.value()==1:
        Ton= utime.ticks_us()
    t= (Ton-Toff) / 2
    distance = int(t*0.034)
    return distance

def map(value, in_min, in_max, out_min, out_max):
    value = max(in_min, min(in_max, value))
    return (value-in_min)*(out_max-out_min) / (in_max-in_min) +out_min

while True : 
    d1= ultrason()
    interval= map(d1, 0, 100, 0, 1)
    print(d1)
    buzzer.duty_u16(20000)
    ledR.on()
    utime.sleep(interval)
    buzzer.duty_u16(0)
    ledR.off()
    utime.sleep(interval)