#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define ECHO_PIN 2
#define TRIG_PIN 3
int ledRojo = 8;
int ledAmarillo = 9;
int ledVerde = 10;


void setup() {
  pinMode(ledRojo, OUTPUT);
  pinMode(ledAmarillo, OUTPUT);
  pinMode(ledVerde, OUTPUT); 
  lcd.init();
  lcd.backlight();
  lcd.clear();

}
void loop() {
  float distance = readDistanceCM();

  bool muyCerca = distance < 100;
  bool cerca = distance > 100 && distance < 200;
  bool lejos = distance > 200 && distance < 300 || distance > 300;

  if (muyCerca) {
    digitalWrite(ledRojo, HIGH);
    digitalWrite(ledAmarillo, LOW);
    digitalWrite(ledVerde, LOW);
  } else if (cerca) {
    digitalWrite(ledRojo, LOW);
    digitalWrite(ledAmarillo, HIGH);
    digitalWrite(ledVerde, LOW);
  } else if (lejos) {
    digitalWrite(ledRojo, LOW);
    digitalWrite(ledAmarillo, LOW);
    digitalWrite(ledVerde, HIGH);
  }

  lcd.setCursor(2, 0);
  lcd.print("DISTANCIA:");
  lcd.setCursor(1, 1);
  lcd.print(readDistanceCM());
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}