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DIY-Midi-Controller-full

Made by Gustavo Silveira, 2024.

  • This Sketch rmakes the Arduino a full MIDI controller.

http://go.musiconerd.com http://www.youtube.com/musiconerd http://facebook.com/musiconerdmusiconerd http://instagram.com/musiconerd/ http://www.gustavosilveira.net [email protected]

If you are using for anything that's not for personal use don't forget to give credit.

- Update 1 (03/12/19): You can add multiple multiplexers for potentiometers.
- Update 2 Threads added. it makes your MIDI controller faster.
- Update 3 Encoder functionality added, using a super handy library.
- Update 4 (03/18/19): Multiple encoders tested and working.
- Update 5 (03/19/19): Multiple encoders (with banks) tested and working.
- Update 6 (06/01/20): Custom note numbers and CC
- Update 7 (06/02/20): Velocity Variable
- Update 8 (06/02/20): Buttons using CC
- Update 9 (06/08/20): Toggle mode added
- Update 10 (11/17/20): Addressable led Midi feedback with FastLed lib (ATmega32U4 only) 
- Update 11 (03/14/21): Tabs; Oled displays, 75HC595 Bit shifter for LED feedback and VU; and many fixes.
- Update 12 (06/25/21): Better pot reading; High Res Faders; Motorized Faders.
- Update 13 (01/09/21): Custom Note Numbers, CC and Toggle: Now you can use them at the same time with different buttons.  
- Update 14 (01/09/21): How to change octaves and show it on the display.
- Update 15 (01/04/22): Motorized Faders
- Update 16 (01/08/22): MIDI Din
- Update 17 (01/11/22): BLE MIDI
- Update 18 (04/14/23): More MIDI Messages
- Update 19 (04/14/23): LED MIDI In in the Arduino (w/o bit shifter)
- Update 20 (04/14/23): Encoder Sensitivity
- Update 21 (04/14/23): Encoder High Resolution
- Update 22 (04/14/23): MCP23017 Encoder "multiplexing"

Introduction

This guide provides detailed instructions on how to build and use a DIY MIDI controller using the provided Arduino sketches.

Hardware Requirements

  • Arduino Board (ATmega328, ATmega32U4, Teensy)
  • Potentiometers
  • Encoders
  • Buttons
  • MCP23017 (for additional I/O)
  • Neopixel LEDs
  • OLED Display
  • Motorized Faders (optional)
  • Breadboard and jumper wires

Software Requirements

  • Arduino IDE
  • Required Libraries:
    • Adafruit_NeoPixel
    • Wire
    • MIDI

Installation Guide

  1. Download the Code: Clone or download the repository to your local machine.

    git clone https://github.com/yourusername/DIY_MIDI_Controller.git

  2. Install Arduino IDE: If not already installed, download and install the Arduino IDE from the official website.

  3. Install Required Libraries: Open the Arduino IDE and go to Sketch -> Include Library -> Manage Libraries.... Search and install the required libraries mentioned above.

  4. Upload Code to Arduino: Open the .ino files in the Arduino IDE and upload them to your Arduino board.

Code Explanation

  • 2023.08.09_en_DIY_midi_controller_full.ino: The main sketch that initializes and manages the MIDI controller.
  • A__EXTRA.ino: Additional functions and features.
  • A_ENCODERS.ino: Code handling the encoder inputs.
  • A_ENCODERS_MCP23017.ino: Handling encoders with the MCP23017 expander.
  • A_POTENTIOMETERS.ino: Code for potentiometer inputs.
  • B_BUTTONS.ino: Handling button inputs.
  • BLEMIDI_input.ino: Code for Bluetooth MIDI input.
  • C_BANKS.ino: Code for bank switching.
  • C_OCTAVE.ino: Code for octave switching.
  • LOOP.ino: Main loop handling MIDI messages.
  • MACKIE.h: Header file for Mackie control functions.
  • MOTORIZED_FADERS.ino: Code for motorized faders (optional).
  • NEOPIXEL.ino: Code for controlling Neopixel LEDs.
  • OLED_DISPLAY.ino: Code for OLED display.
  • VU.ino: Code for VU meter.
  • Z_ATMEGA328.ino, Z_ATMEGA32U4.ino, Z_SETUP.ino, Z_TEENSY.ino: Specific setup codes for different microcontrollers.

Usage

  1. Connect the Hardware: Connect all the required components (potentiometers, encoders, buttons, etc.) to your Arduino board as per the provided pin configuration.

  2. Power the Arduino: Connect the Arduino to your computer or a power source.

  3. Run the Code: Open the Arduino IDE, select your board and port, and upload the main sketch.

  4. MIDI Configuration: Configure your DAW (Digital Audio Workstation) to recognize the MIDI signals from the Arduino.

Customizing the Code

Board Selection

Choose your board by defining it. Uncomment and set the appropriate board definition in the code:

#define ATMEGA328 1  // Uncomment if using ATmega328 - Uno, Mega, Nano...
//#define ATMEGA32U4 1  // Uncomment if using ATmega32U4 - Micro, Pro Micro, Leonardo...
//#define TEENSY 1  // Uncomment if using a Teensy board
//#define BLEMIDI 1  // Uncomment if using BLE MIDI (ESP32)
//#define DEBUG 1  // Uncomment if you just want to debug the code in the serial monitor

Component Usage

Uncomment or comment the following lines based on the components you are using:

#define USING_BUTTONS 1  // Comment if not using buttons
#define USING_POTENTIOMETERS 1  // Comment if not using potentiometers
//#define USING_HIGH_RES_FADERS 1  // Comment if not using high res faders
//#define USING_MOTORIZED_FADERS 1  // Comment if not using motorized faders
//#define USING_MUX 1  // Uncomment if using a multiplexer
#define USING_ENCODER 1  // Comment if not using encoders
//#define USING_ENCODER_MCP23017 1  // Uncomment if using encoders with MCP23017
//#define TRAKTOR 1  // Uncomment if using with Traktor
//#define USING_NEOPIXEL 1  // Uncomment if using neopixels
//#define USING_DISPLAY 1  // Uncomment if using an I2C Oled Display
//#define USING_BANKS_WITH_BUTTONS 1  // Uncomment if using banks with buttons
//#define USING_LED_FEEDBACK 1  // Uncomment if using LED feedback
//#define USING_74HC595 1  // Uncomment if using 74HC595 Bit Shifter
//#define USING_VU 1  // Uncomment if using a VU meter
//#define USING_MACKIE 1  // Uncomment if using the Mackie Protocol
//#define USING_OCTAVE 1  // Uncomment if using octave change buttons
//#define MIDI_DIN 1  // Uncomment if using Physical MIDI din 5-pin connector

Pin Configuration

Configure the pins for your components. Below are some examples:

Buttons

const byte N_BUTTONS = 3;  // Total number of buttons
const byte BUTTON_ARDUINO_PIN[N_BUTTONS] = { 2, 3, 4 };  // Pins for each button
byte MESSAGE_TYPE[N_BUTTONS] = { NN, NN, NN };  // Message type for each button (NN, CC, T, PC)
byte MESSAGE_VAL[N_BUTTONS] = { 36, 37, 38 };  // Message value for each button

Potentiometers

const byte N_POTS = 2;  // Total number of pots
const byte POT_ARDUINO_PIN[N_POTS] = { A2, A1 };  // Pins for each pot
byte MESSAGE_TYPE_POT[N_POTS] = { CC, PB };  // Message type for each pot (CC, PB)
byte POT_CC_N[N_POTS] = { 1, 2 };  // CC number for each pot

Encoders

const byte N_ENCODERS = 2;  // Total number of encoders
Encoder encoder[N_ENCODERS] = { { 10, 16 }, { 14, 15 } };  // Pins for each encoder
byte ENCODER_CC_N[N_ENCODERS] = { 11, 12 };  // CC number for each encoder

Preset Configuration for Encoders

The preset array stores initial values for the encoders across different MIDI channels. This allows you to start your encoders with specific values.

Code Explanation

byte preset[N_ENCODER_MIDI_CHANNELS][N_ENCODERS] = {
  // stores presets to start your encoders
  //  {64, 64}, // ch 1
  //  {64, 64}, // ch 2
  //  {64, 64}, // ch 3
  //  {64, 64}, // ch 4
  //  {64, 64}, // ch 5
  //  {64, 64}, // ch 6
  //  {64, 64}, // ch 7
  //  {64, 64}, // ch 8
  //  {64, 64}, // ch 9
  //  {64, 64}, // ch 10
  //  {64, 64}, // ch 11
  //  {64, 64}, // ch 12
  //  {64, 64}, // ch 13
  //  {64, 64}, // ch 14
  //  {64, 64}, // ch 15
  //  {64, 64}  // ch 16
};

How to Customize

  1. Define the Presets: Replace the values within the curly braces with your desired starting values for each encoder. Each inner array corresponds to a MIDI channel, and each value within the inner array corresponds to an encoder.

Example:

byte preset[N_ENCODER_MIDI_CHANNELS][N_ENCODERS] = {
  {0, 127}, // ch 1
  {10, 120}, // ch 2
  {20, 110}, // ch 3
  {30, 100}, // ch 4
  {40, 90}, // ch 5
  {50, 80}, // ch 6
  {60, 70}, // ch 7
  {70, 60}, // ch 8
  {80, 50}, // ch 9
  {90, 40}, // ch 10
  {100, 30}, // ch 11
  {110, 20}, // ch 12
  {120, 10}, // ch 13
  {127, 0}, // ch 14
  {64, 64}, // ch 15
  {64, 64}  // ch 16
};

MCP23017 Encoder Configuration

If you are using encoders with the MCP23017 I/O expander, configure the settings as follows:

Code Explanation

#ifdef USING_ENCODER_MCP23017

const int I2C_ADDRESS = 0x20;  // MCP23017 I2C address

const byte N_ENC_MCP23017 = 6;      // Number of encoders used
const byte N_ENC_CH_MCP23017 = 16;  // Number of ENCODER_MIDI_CHs

int encoderPin[N_ENC_MCP23017][2] = {{8, 9}, {0, 1}, {12, 13}, {10, 11}, {2, 3}, {14, 15}};  // Pin numbers for the A and B channels of each encoder
int INT_PIN = 8;  // Microcontroller pin attached to INTA/B

int count[N_ENC_MCP23017] = { 0 };      // Current count of each encoder
int lastCount[N_ENC_MCP23017] = { 0 };  // Previous count of each encoder

int encoderA[N_ENC_MCP23017] = { 0 };         // Current state of the A channel of each encoder
int encoderB[N_ENC_MCP23017] = { 0 };         // Current state of the B channel of each encoder
int lastEncoderA[N_ENC_MCP23017] = { HIGH };  // Previous state of the A channel of each encoder
int lastEncoderB[N_ENC_MCP23017] = { HIGH };  // Previous state of the B channel of each encoder

byte ENCODER_CC_N[N_ENC_MCP23017] = { 15, 16, 17, 18, 19, 20 };  // Add the CC NUMBER of each encoder you want

Adafruit_MCP23X17 mcp;  // Create an instance of the Adafruit_MCP23X17 class

#endif  // USING_ENCODER_MCP23017

How to Customize

  1. Set the I2C Address: Change the I2C_ADDRESS if your MCP23017 uses a different address.

  2. Define Encoder Pins: Adjust the encoderPin array to match the pins you have connected your encoders to. Each inner array should contain the pin numbers for the A and B channels of an encoder.

Example:

int encoderPin[N_ENC_MCP23017][2] = {
  {8, 9},
  {0, 1},
  {12, 13},
  {10, 11},
  {2, 3},
  {14, 15}
};

  1. Set Interrupt Pin: Define the INT_PIN to the microcontroller pin connected to the MCP23017 interrupt output.

  2. Initialize Encoder States: Initialize count, lastCount, encoderA, encoderB, lastEncoderA, and lastEncoderB arrays as shown.

  3. Assign CC Numbers: Assign the desired MIDI CC numbers to the ENCODER_CC_N array for each encoder.

Example:

byte ENCODER_CC_N[N_ENC_MCP23017] = { 15, 16, 17, 18, 19, 20 };

This concludes the instructions for configuring encoder presets and setting up MCP23017 encoders.

Multiplexers

#define N_MUX 1  // Number of multiplexers
#define s0 18
#define s1 19
#define s2 20
#define s3 21
#define x1 A0  // Analog pin of the first mux
Multiplexer4067 mux[N_MUX] = {
  Multiplexer4067(s0, s1, s2, s3, x1),
  // Add more if you have additional muxes
};

Usage

  1. Connect the Hardware: Connect all the required components (potentiometers, encoders, buttons, etc.) to your Arduino board as per the provided pin configuration.

  2. Power the Arduino: Connect the Arduino to your computer or a power source.

  3. Run the Code: Open the Arduino IDE, select your board and port, and upload the main sketch.

  4. MIDI Configuration: Configure your DAW (Digital Audio Workstation) to recognize the MIDI signals from the Arduino.

Troubleshooting

  • Arduino Not Recognized: Ensure the correct board and port are selected in the Arduino IDE.
  • Libraries Not Found: Verify that all required libraries are installed correctly.
  • No MIDI Signal: Check connections and ensure the MIDI settings in your DAW are configured properly.

Contributing

If you would like to contribute to this project, please fork the repository and submit a pull request. Contributions can include code improvements, bug fixes, documentation, and new features.

This is a basic structure for the GitHub Wiki. You can expand each section with more detailed information, diagrams, and code snippets as needed.

Troubleshooting

  • Arduino Not Recognized: Ensure the correct board and port are selected in the Arduino IDE.
  • Libraries Not Found: Verify that all required libraries are installed correctly.
  • No MIDI Signal: Check connections and ensure the MIDI settings in your DAW are configured properly.

Contributing

If you would like to contribute to this project, please fork the repository and submit a pull request. Contributions can include code improvements, bug fixes, documentation, and new features.

This is a basic structure for the GitHub Wiki. You can expand each section with more detailed information, diagrams, and code snippets as needed.

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