#include <LiquidCrystal_I2C.h>

const int ECHO = 7;
const int TRIG = 8;
int duracao = 0;
long distancia = 0;
int red = 0;
int yel = 0;
int gre = 0;
const int buzzer = 9;



void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  pinMode(ECHO, INPUT);
  pinMode(TRIG, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(12, OUTPUT); 
}
void loop() {
  digitalWrite(TRIG, LOW);
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);
  duracao = pulseIn(ECHO, HIGH);
  distancia = duracao / 58;
  Serial.print("Distancia em cm: ");
  Serial.println(distancia);
  delay(100);

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

  duracao = pulseIn(ECHO, HIGH);
  distancia = duracao / 58;

  if (distancia < 5){
    digitalWrite(13, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(12, LOW);
    tone(buzzer, 1200);
    delay(200);
    noTone(buzzer);


  } else if (distancia >= 5 && distancia < 10) {
    digitalWrite(13, LOW);
    digitalWrite(4, HIGH);
    digitalWrite(12, LOW);
    tone(buzzer, 1200 - (distancia - 2) * 100);
    delay(500);
    noTone(buzzer);


  } else if (distancia > 10) {
    digitalWrite(13, LOW);
    digitalWrite(4, LOW);
    digitalWrite(12, HIGH);
    delay(1000);
    noTone(buzzer);
    
  }

}