#include <NewPing.h>
#include <LiquidCrystal_I2C.h>

#define TRIGGER_PIN 4
#define ECHO_PIN 5
#define MAX_DISTANCE 400
#define THRESHOLD_DISTANCE (MAX_DISTANCE / 2)

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int outputPin = 6;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();

  pinMode(outputPin, OUTPUT);
  digitalWrite(outputPin, LOW);
}

void loop() {
  delay(50);

  int distance = sonar.ping_cm();

  lcd.setCursor(0, 0);
  lcd.print("La distancia es");

  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm");

  if (distance <= THRESHOLD_DISTANCE) {
    digitalWrite(outputPin, HIGH);
  } else {
    digitalWrite(outputPin, LOW);
  }
}