#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);  
int tringPin = 15 ;
int echoPin = 2 ;
float velocidad = 0.0343 ;
float duracion, distancia ;
void setup() {
  lcd.init();
  lcd.backlight();
  pinMode ( tringPin, OUTPUT );
    pinMode ( echoPin , INPUT );
}

void loop() {  
  lcd.setCursor( 1,0 );
  lcd.print("Electronica");

  digitalWrite(tringPin, LOW);
  delayMicroseconds(2);
  digitalWrite(tringPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(tringPin, LOW);
  duracion = pulseIn (echoPin, HIGH);
  distancia = velocidad* duracion / 2;
  lcd.setCursor(0,1);
  lcd.print("distancia=");
  lcd.print(distancia,1);
  lcd.print("cm");
}