"""
08.50 - Sensor ultrasónico de distancia, módulo HC-SR04
Este segmento muestra cómo usar el sensor de distancia ultrasónico 
 ESP32 HC-SR04.
Autores :
   Sanchez Vargas Leticia Daniela  
   Rivera Quintero Josselin
   Garcia Del Carmen Andres
Fecha: 
   07/09/2023
"""
from machine import Pin, SoftI2C, Timer
import dht,
from time import sleep_us,sleep
from lcd_api import LcdApi
from i2c_lcd import I2cLcd

echo=Pin(25,Pin.IN)
trig=Pin(27,Pin.OUT)
I2C_ADDR = 0x27
totalRows = 2
totalColumns = 16
i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=10000)
lcd = I2cLcd(i2c, I2C_ADDR, totalRows, totalColumns)

def medicion_US(event):
    trig.value(0)
    sleep_us(2)
    trig.value(1)
    sleep_us(10)
    trig.value(0)
    
    x=machine.time_pulse_us(echo,1)
    distance=(0.034*x)/2 
    print('Distance:', distance, 'cm')
    sleep(1)
    
US_timer = Timer(1)
US_timer.init(period=5000, mode=Timer.PERIODIC, callback=medicion_US)