import machine
import hcsr04
import time

ultrasonic = hcsr04.HCSR04(trigger_pin=13, echo_pin=12, echo_timeout_us=1000000)
led = machine.Pin(2, machine.Pin.OUT)
buzzer = machine.PWM(machine.Pin(32, machine.Pin.OUT))
buzzer.freq(4186)
buzzer.duty(0)

while True:
    distance = ultrasonic.distance_cm()
    print('Distance:', distance, 'cm', '|', distance/2.54, 'inch')
    if distance <= 10:
        buzzer.duty(512)
        led.on()
    else:
        buzzer.duty(0)
        led.off()
    time.sleep_ms(1000)