Arduino-based MIDI Controller

A MIDI controller is useful for producing music, as well as life performance.

Make your own MIDI Controller with cheap materials!

The following instruction is partially in Chinese.

Main Feature:

可彈奏鋼琴上一個八度的音(包含黑鍵)

透過按鍵，切換音域至高8度

透過可變電阻作為旋鈕，控制效果器參數

Reference:

Step 1: Hardware Required

•Arduino UNO R3

•適當大小的麵包版

•公對公杜邦線 至少14條 ：從Arduino板接上12個觸控模塊、1個開關、1個可變電阻，在麵包版上的接線，使用小跳線較優。

•TTP223 觸控按鍵模塊 (D2A4) 至少12個：觸摸時輸出高電位，反之輸出低電位。

•小跳線：越多越好，功能同杜邦線。

•無斷開關

•10k可變電阻

Step 2: Hardware Connection

1. 可變電阻及按鈕：將兩者如電路圖所示的接上arduino及麵包板。可變電阻接pin A0，按鈕接pin A1 (因為digital pin 2-13都接上觸控模塊了)。

2. 觸控按鍵模塊：如圖所示，按照模組上的標示將三個接腳分別接上5V、GND及arduino腳位，並照圖上排成類似鋼琴鍵的樣子。訊號腳由左至右分別接到pin 2~13，下排的線路可自製短單芯線接至上排線路。

3. 都接上後即大功告成！

Step 3: About MIDI

MIDI，為Musical Instrument Digital Interface的縮寫，是工業標準的電子通訊協定。概念如同樂譜，記錄音高、節拍、力度等資訊，而非音訊，所以檔案比.mp3小很多。MIDI可讓電腦的音源演奏我們寫的音樂，猶如把樂譜拿給樂師演奏。

MIDI資料格式有3 bytes，分別是Status byte, Data byte 1, Data byte 2，請參閱https://www.midi.org/specifications/item/table-1-s...。

Note table: http://www.blog.finetanks.com/?p=90

例如：經由Channel 1，發出C4音 (中央C)，力度100，此3 bytes為(144, 60, 100)。

baud rate設為19200，而非一般Serial monitor的9600。

Step 4: Code

Download the source code: https://drive.google.com/open?id=0BxJZTZDiPRQhUWF5...

Revised from https://raw.githubusercontent.com/langsound/Digita...

The pitch is not confined to the range of C4, C#4, D4,..., B4. You can adjust the range by editing the code.

Step 5: Arduino to MIDI

Download Hairless MIDI:http://projectgus.github.io/hairless-midiserial/

Download loopMIDI: http://www.tobias-erichsen.de/software/loopmidi.ht...

Follow the instruction on those websites.

Turn off the serial monitor before connecting Arduino to Hairless MIDI!

Step 6: MIDI to Music

Any DAW works.

We demonstrated using FL studio 12.

Set "loopMIDI port" as MIDI input.

Step 7: Try to Play Your Hand-made MIDI Instrument

Step 8: Life Performance

The potentiometer was linked to master volume.

Step 9: Advanced Life Performance

The potentiometer can be linked to anything. In this clip, it was linked to the cutoff frequency of low pass filter.