#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigpin = 12;
const int echopin = 14;
int sm;
int distancia; 

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.clear();
  lcd.backlight();
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);

}

void loop() {
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);

  sm = pulseIn(echopin, HIGH);
  distancia = sm * 0.03408/2;
  lcd.setCursor(0, 0);
  lcd.print(distancia);
  delay(500);
  lcd.clear();
}