#include <Arduino.h>


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


#include <HCSR04.h>

#define buzzer 27

#define ledC_Channel 0 // channel 0
#define rez 8          // 8-bit resolution

#define infravermelho 33

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

UltraSonicDistanceSensor distanceSensor(triggerPin, echoPin, maxCm);

float frequency = 0, semitom = 0;
byte ult_semitom = 255;
const float f0 = 1046.502075;

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

  ledcAttach(ledC_Channel, 2000, rez);  // 2kHz tone, 8-bit resolution
  ledcAttachPin(buzzer, ledC_Channel);

  pinMode(infravermelho, INPUT);
}

void loop()
{
  if (!digitalRead(infravermelho))
  {
    semitom = map(constrain(distanceSensor.measureDistanceCm(), 0, 90), 0, 90, 14, 0);

    if (semitom != ult_semitom)
    {
      ult_semitom = semitom;

      frequency = f0 * pow(2, (semitom / 12));
      
      Serial.println("+" + String(semitom) + " : " + String(frequency) + "Hz");
      
      ledcWriteTone(ledC_Channel, (uint32_t)frequency);
    }
  }

  else
  {
    ledcWriteTone(ledC_Channel, 0);  // Stop sound

    ult_semitom = 255;
  }
  
  delay(1);
}