"Random MIDI Button" rev_01

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    - Project: "Random MIDI Button"
    - Source Code compiled for: Arduino Nano
    - Source Code created on: 2024-01-02 20:40:18

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Use the midi library to create a simple midi */
    /* controller that plays a random note on the press */
    /* if the button. When the button. Is pressed again, */
    /* send a note off message for the already played */
    /* note and play another random note. Add a timeout */
    /* after 5s */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Arduino.h>
#include <EasyButton.h>
#include <MIDI.h>

/****** FUNCTION PROTOTYPES *****/
void setup();
void loop();
void handleButtonPress();

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t button1_PushButton_PIN_D2 = 2;

/****** DEFINITION OF LIBRARY CLASS INSTANCES*****/
EasyButton button1(button1_PushButton_PIN_D2);
MIDI_CREATE_DEFAULT_INSTANCE();

// MIDI note range
const int MIDI_NOTE_MIN = 48;
const int MIDI_NOTE_MAX = 72;

// Timeout duration
const unsigned long TIMEOUT_DURATION = 5000; // 5 seconds

// Variables to track button state and timeout
bool buttonPressed = false;
unsigned long buttonPressTime = 0;
bool notePlaying = false;
int currentNote = 0;
unsigned long timeoutStartTime = 0;

void setup()
{
  // Initialize the button object
  button1.begin();

  // Set the button callback
  button1.onPressed(handleButtonPress);

  // Initialize MIDI
  MIDI.begin();
}

void loop()
{
  // Read the button state
  button1.read();

  // Check for timeout
  if (notePlaying && millis() - timeoutStartTime >= TIMEOUT_DURATION)
  {
    MIDI.sendNoteOff(currentNote, 0, 1);
    notePlaying = false;
  }
}

void handleButtonPress()
{
  // Check if the button was just pressed
  if (button1.isPressed())
  {
    // If a note is already playing, send note off
    if (notePlaying)
    {
      MIDI.sendNoteOff(currentNote, 0, 1);
      notePlaying = false;
    }

    // Generate a random note
    currentNote = random(MIDI_NOTE_MIN, MIDI_NOTE_MAX + 1);

    // Send note on
    MIDI.sendNoteOn(currentNote, 127, 1);

    // Set note playing flag and timeout start time
    notePlaying = true;
    timeoutStartTime = millis();
  }
}