from machine import Pin, PWM
from utime import sleep,ticks_us
# import random
# buzzer = PWM(Pin(0))
# buzzer.duty_u16(2000)
# freq = random.randint(100,10001)
# while True:
#     buzzer.freq(freq)
#     freq = random.randint(100,10001)
# sleep(1)
# buzzer.duty_u16(0)

trigger = Pin(28, Pin.OUT)
echo = Pin(26, Pin.IN)

def measure_distance():
    trigger.low()
    sleep(0.002)
    trigger.high()
    sleep(0.005)
    trigger.low()

    while echo.value() == 0:
        signal_off = ticks_us()
    
    while echo.value() == 1:
        signal_on = ticks_us()
    time_passed = signal_on - signal_off
    distance = (time_passed * 0.0343) / 2
    return distance

while True:
    dist = measure_distance()
    print(f"Distance: {dist:.3f} cm")
    sleep(1)