Nicola Landro

ITALY • + Follow

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ITALY
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Engineer

ITALY
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kadu

BRAZIL
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Nicola Landro

ITALY
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4

Tools, APP Software Used etc.

arduino IDE

Arduino

Description

Stylophone Midi Complete controller

This project have the aim to make a stylophone with a midi usb interface that can be easily connected to a computer or a phone and you can also play in your headphone in a train with a full featured midi controller that you can put in your pocket.

Code

Stylophone Midi

C/C++

#include <USB-MIDI.h>
USBMIDI_CREATE_DEFAULT_INSTANCE();

//#define DEBUG

#define LED_PLUS 14
#define LED_LESS 16
#define LED_FN 10 

#define BUTTONS_LEN 9
const int buttons[BUTTONS_LEN] = {9, 8, 7, 5, 3, 2, 6, 4, 15};
const String btns_actions[BUTTONS_LEN * BUTTONS_LEN] = { "FN", "", "", "OCT_PLUS", "", "", "OCT_LESS", "", "", 
                                                         "FN", "", "", "", "", "", "", "", "" };
bool btns[BUTTONS_LEN * BUTTONS_LEN] = {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false};
bool btns_mid_state[BUTTONS_LEN * BUTTONS_LEN] = {false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false};
bool fn_enabled = false;

#define KNOB_TOLERANCE 3
#define KNOBS_LEN 3
const int KNOBS[KNOBS_LEN] = {0, 1, 2};
int knobvalold[KNOBS_LEN] = {0, 0, 0};
int controlknobs[KNOBS_LEN] = {14, 15, 16};

#define KEYBOARD_TOLERANCE 3
#define KEYBOARD 3
#define BASE_MIDI 60
int octave = 0;
#define KEYMAX 1021
#define KEY_LEN 15
const int KEYS[KEY_LEN] = {959,954,950,944,937,929,920,909,894,876,852,818,768,681,511 };

bool key1 = false;
int keyvalold = KEYMAX;
int note = -1;
int noteold = -1;
int velocity = 127;

void setup() {
  #ifdef DEBUG
  Serial.begin(9600);
  #endif
  MIDI.begin(1);

  pinMode(LED_PLUS, OUTPUT);
  // digitalWrite(LED_PLUS, HIGH);
  pinMode(LED_LESS, OUTPUT);
  // digitalWrite(LED_LESS, HIGH);
  pinMode(LED_FN, OUTPUT);
  // digitalWrite(LED_FN, HIGH);

  for (int i=0; i < BUTTONS_LEN; i++){
    pinMode(buttons[i], INPUT);
  }
}

void loop() {
  // Octave LED
  if (octave > 0){
    digitalWrite(LED_PLUS, HIGH);
    digitalWrite(LED_LESS, LOW);
  }
  else if (octave < 0){
    digitalWrite(LED_PLUS, LOW);
    digitalWrite(LED_LESS, HIGH);
  }
  else {
    digitalWrite(LED_PLUS, LOW);
    digitalWrite(LED_LESS, LOW);
  }

  //Manage Generic Buttons
  for (int i_orig=0; i_orig < BUTTONS_LEN; i_orig++){
    int btn_read = digitalRead(buttons[i_orig]);
    int i = i_orig;
    if (fn_enabled){
      i = i + BUTTONS_LEN;
    }
    // Serial.println("Button " + String(btn_read));
    if (btn_read == HIGH && !btns[i]) {
      btns[i] = true;
      Serial.println("Button " + String(i) + " Pressed");
      if (btns_actions[i] == "OCT_LESS") {
        #ifdef DEBUG
        Serial.println("Octave less");
        #endif
        octave--;
      }
      else if (btns_actions[i] == "OCT_PLUS") {
        #ifdef DEBUG
        Serial.println("Octave plus");
        #endif
        octave++;
      }
      else if (btns_actions[i] == "FN") {
        #ifdef DEBUG
        Serial.println("FN");
        #endif
        btns_mid_state[i] = ! btns_mid_state[i];
        if (btns_mid_state[i]){
          digitalWrite(LED_FN, HIGH);
        }
        else{
          digitalWrite(LED_FN, LOW);
        }
        fn_enabled = btns_mid_state[i]; 
      }
      else {
        btns_mid_state[i] = ! btns_mid_state[i];
        #ifdef DEBUG
        Serial.println("Midi " + String(i) + " send state " + String(btns_mid_state[i]));
        #endif
        btns_mid_state[i] ? MIDI.sendControlChange(i, 127, 1) : MIDI.sendControlChange(i, 0, 1);
      }
    } else if (btn_read == LOW && btns[i]) {
      btns[i] = false;
      #ifdef DEBUG
      Serial.println("Button " + String(i) + " Released");
      #endif
    }
  }

  // Manage Knobs
  for (int i=0; i < KNOBS_LEN; i++){
    int knobval = map(analogRead(KNOBS[i]), 0, 1023, 0, 127);
    if (knobval > (knobvalold[i] + KNOB_TOLERANCE) || knobval < (knobvalold[i] - KNOB_TOLERANCE)) {
      knobvalold[i] = knobval;
      #ifdef DEBUG
      Serial.println(String(i) + " Knob " + String(controlknobs[i]) + ": " + String(knobval));
      #endif
      if (i!= 0){
        MIDI.sendControlChange(controlknobs[i], knobval, 1);
      } else {
        velocity = knobval;
      }
    }
  }

  // Manage Keyboard
  int keyval = analogRead(KEYBOARD);

  if (keyval < (KEYMAX - KEYBOARD_TOLERANCE)) { // key pressed
    // Serial.println(keyval);
    if (keyval < (keyvalold - KEYBOARD_TOLERANCE) || keyval > (keyvalold + KEYBOARD_TOLERANCE)) {  // key changed
      // Serial.println(keyval);
      for (int i=0; i < KEY_LEN; i++){
        if (keyval < (KEYS[i] + KEYBOARD_TOLERANCE) && keyval > (KEYS[i] - KEYBOARD_TOLERANCE)) { //the key i is pressed
          note = BASE_MIDI + (12 * octave) + i;
          #ifdef DEBUG
          Serial.println("Press Key: " + String(note) + " " + String(keyval));
          #endif
          
          if (key1){
            MIDI.sendNoteOff(noteold, 0, 1);
          }
          key1 = true;
          MIDI.sendNoteOn(note, velocity, 1);
          noteold = note;
        }
      }
    }
  } else {  // Key released
    if (key1) {
      #ifdef DEBUG
      Serial.println("Release Key: " + String(keyval));
      #endif
      MIDI.sendNoteOff(noteold, 0, 1);
      key1 = false;
    }
  }
  keyvalold = keyval;
}

Download Gerbers Download BOM(Bill of materials)

Nov 05,2023

559 views

Stylophone Midi Complete controller

Complete midi controller like the small keyboard, but it is enought smaller to can put in your pocket and play in train with your smartphone

559

Published: Nov 05,2023

Download Gerber file 4

BOM(Bill of materials)

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