from time import sleep
from machine import Pin, ADC, PWM
from hcsr04 import HCSR04
ultrasonic = HCSR04(trigger_pin=13, echo_pin=12, echo_timeout_us=1000000)
led1 = Pin(2,Pin.OUT)
led2 = Pin(4,Pin.OUT)
led3 = Pin(5,Pin.OUT)
while True:
    distance = ultrasonic.distance_cm()
    print('Distance', 'cm', '|', distance/2.54, 'Inch')
    if distance<= 200:
        led1.on()
        led2.off()
        led3.off()
    elif distance<= 350:
        led1.off()
        led2.on()
        led3.off()
    elif distance<= 350:
        led1.off()
        led2.off()
        led3.on()
    else:
        led1.off
        led2.off
        led3.off
    sleep(5)