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

// Definir pinos do sensor ultrassônico
#define TRIGGER_PIN 4
#define ECHO_PIN 5
#define MAX_DISTANCE 200

#define  buzzer 15
#define  led 2

// Configurar LCD I2C
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Configurar sensor ultrassônico
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup() {
  Serial.begin(115200);

  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);

  // Inicializar o LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Iniciando...");

}

void loop() {
  // Medir a distância
  delay(50);
  int distance = sonar.ping_cm();

  // Exibir a distância no LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distancia: ");
  lcd.setCursor(0, 1); 
  lcd.print(distance);
  lcd.print(" cm");

  // Debug no Serial Monitor
  Serial.print("Distancia: ");
  Serial.print(distance);
  Serial.println(" cm");

  if(distance < 100)
  {
    tone(buzzer,1000);
    digitalWrite(led,1);
    delay(distance *10);
    noTone(buzzer);
    digitalWrite(led,0);
    delay(distance *10);
  }
}