//Sensor de ré UTILIZANDO Esp32_HC-SR04__LCD IC2_TRAB FINAL
#include <Wire.h>
#include <LiquidCrystal_I2C.h>


#define Trigger_PIN 32  // Pino do trigger do sensor HC-SR04
#define Echo_PIN 35     // Pino do echo do sensor HC-SR04
#define BUZZER_PIN 18   // Pino para o buzzer
#define LED_PIN 27    // Pino para o LED

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
void setup()
{
  
   pinMode(BUZZER_PIN, OUTPUT);
  pinMode(Trigger_PIN, OUTPUT);
  pinMode(Echo_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  lcd.begin(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
// Init
  //lcd.init();
  //lcd.backlight();

  // Init
  lcd.init();
  lcd.backlight();
  
  lcd.print("   Bem-vindo!   ");
  lcd.setCursor(3, 0);
  lcd.print("    Ao Projeto   ");
  delay(2000);
  lcd.clear();
}

void loop()
{

  digitalWrite(Trigger_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(Trigger_PIN, LOW);


  long duration=pulseIn(Echo_PIN,HIGH);
  float distance_cm = duration/59;
  
 
 // duration = pulseIn(Echo,HIGH);
  //distance_cm = 

 


  // Ler o tempo de retorno do pulso
  //duration = pulseIn(Echo_PIN, HIGH);

  // Calcular a distância
 // d = (t/2)/29.1 ;

  // Mostrar a distância no display LCD

  lcd.setCursor(2, 1);
  lcd.print("distancia cm : ");
  lcd.setCursor(7, 3);
  lcd.print(distance_cm);


  // Ligando o buzzer e acendendo o LED baseado na distância medida
  if (distance_cm <= 30){
  digitalWrite(BUZZER_PIN, HIGH);
  digitalWrite(LED_PIN, HIGH);
               }
 
  else
  {
    digitalWrite(BUZZER_PIN,LOW);
    digitalWrite(LED_PIN, LOW);
  }

  delay(100);
 
  }