from machine import Pin, ADC, PWM
from time import sleep
from hcsr04 import HCSR04
ultrasonic = HCSR04(trigger_pin=13, echo_pin=12, echo_timeout_us=1000000)
led1 = Pin(2, Pin.OUT)

buzzer = PWM(Pin(15, Pin.OUT))
buzzer.freq(4186)
buzzer.duty(0)
while True:
    distance = ultrasonic.distance_cm()
    print('Distance: ',distance,'cm','|',distance/2.54,'inch')
    if distance <= 200:
        led1.on()
        #led2.off()
        #led3.off()
        buzzer.duty(0)
    #elif 

        #buzzer.duty(0)
    #elif 
    
        #buzzer.duty(512)
    else:
        led1.off()
        #led2.off()
        #led3.off()
    sleep(5)