#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define TRIGGER_PIN 13
#define ECHO_PIN 12

LiquidCrystal_I2C lcd(0x27, 16, 2); 

void setup() {
  Serial.begin(115200);
  
  lcd.init();
  lcd.backlight();
  
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

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

  long duration = pulseIn(ECHO_PIN, HIGH);
  
  float distance = (duration / 2.0) * 0.0343;
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distancia:");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm");

  delay(500); 
}