#include <Arduino.h>


/**
* Project: -
* Author: Matrodsilver
* Description: Instrument  :D
* License: MIT
**/


#include <HCSR04.h>

#define buzzer 27
#define infravermelho 33

#define triggerPin 25
#define echoPin 26
#define maxCm 405


UltraSonicDistanceSensor distanceSensor(triggerPin, echoPin, maxCm);

float frequency = 0, semitones = 0;
const float f0 = 261.626;

const byte outs[] = {buzzer};
#define qnt_outs = sizeof(outs) / sizeof(byte)

const byte ins[] = {infravermelho};

void setup()
{
  Serial.begin(9600);

  for (byte pinOut : outs) pinMode(pinOut, OUTPUT);

  for (byte pinIn : ins) pinMode(pinIn, INPUT);

  noTone(buzzer);
}

void loop()
{
  if (digitalRead(infravermelho))
  {
    semitones = map(distanceSensor.measureDistanceCm(), 1, 400, 0, 53);

    frequency = f0 * pow(2, (semitones / 12));
    
    Serial.println("+" + String(semitones) + " : " + String(frequency) + "Hz");
    tone(buzzer, 1044, 1);
    delay(2);

    noTone(buzzer);
    delay(1);
  }
}