#include <Ultrasonic.h>
#define trig 2
#define echo 3
#define buzzer A0

int distancia;

Ultrasonic sensor(trig, echo); 

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  distancia = sensor.read();
  Serial.print("Distância: ");
  Serial.println(distancia);
  delay(200);
  
  if (distancia > 300){
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,LOW);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
    noTone(buzzer);
  }

  if(distancia < 300 && distancia  > 200){//liga dois
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,LOW);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
   
    tone(buzzer, 800);
    delay(400);
    noTone(buzzer);
    delay(400);
  }
  if(distancia < 200 && distancia  > 150){//liga 4
   digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10,LOW);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
   
    tone(buzzer, 800);
    delay(300);
    noTone(buzzer);
    delay(300);
  }
  if(distancia < 150 && distancia  > 90){//liga 6
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10,LOW);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
    
    tone(buzzer, 800);
    delay(250);
    noTone(buzzer);
    delay(250);
  }
  if(distancia < 90 && distancia  > 50){//liga 8
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
    
    tone(buzzer, 800);
    delay(100);
    noTone(buzzer);
    delay(100);
  }
  if(distancia < 50 && distancia  >= 0){//liga os 10
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    digitalWrite(12,HIGH);
    digitalWrite(13,HIGH);
   
    tone(buzzer, 800);
    
  }
}