#include <TimerOne.h>
#include <Arduino.h>

#define PIN_LED 13
#define TRIG 2
#define ECHO 3
#define SW1 18
#define buzzerPin 4

void ISR_SW1();
void playBuzzer(float distance);

float last_distance = 0;
float distance = 0;
float tempo = 0;
int time = 0;
void setup()
{
  DDRE = 0b00010100;
  PORTE = 0b00001000;

  attachInterrupt(digitalPinToInterrupt(SW1), ISR_SW1, FALLING);

  pinMode(SW1, INPUT_PULLUP);

  UCSR0A = 0x00;
  UCSR0B = 0x18;
  UCSR0C = 0x06;
  UBRR0H = 0x00;
  UBRR0L = 0x67;

  Timer1.initialize(time);
  Timer1.attachInterrupt(ISR_Timer1);
}

void loop(){
  time = 100;

}

void ISR_SW1()
{
  while (digitalRead(SW1) == 0)
  {
    digitalWrite(PIN_LED, HIGH);
    digitalWrite( TRIG, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG, LOW);
    tempo = pulseIn(ECHO, HIGH );
    distance = ((tempo / 2) * 0.034) * 0.01;
    void ISR_Timer1();
    if (distance == last_distance) {
    }
    else
    {
      Serial.print("O objeto está a: ");
      Serial.print(distance);
      Serial.println("m.");
      last_distance = distance;
    }
    //delay(10000);
  }
  if (digitalRead(SW1) == 1)
  {
    digitalWrite(PIN_LED, LOW);
  }
 // delay(1000);

  
}

void ISR_Timer1() {
  if (digitalRead(SW1) == 1) {
    tone(buzzerPin,500);
    Serial.println("ui");
  }
}