添加一些关于midi播放的项目

arduino-music-box-master/README.md

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+# arduino-music-box
+
+It's Node.js + Arduino project to play any midi file.
+>使用node.js把指定的midi文件转为频率和时间，然后串口发送给arduino播放。
+
+## Prerequisites
+
+1. You need to provide the following environment variables to make it works (the easiest way is to create `.env` file in the project root folder)
+
+```
+SERIAL_PORT=<NAME_OF_SERIAL_PORT>
+BOUD_RATE=<BOUD_RATE>
+MIDI_STORAGE_FOLDER=<MIDI_STORAGE_FOLDER>
+```
+
+2. Electronics:
+   - Arduino Uno
+   - Piezo buzzer
+   - Wires (optional)
+3. Circuit scheme
+   1. v1 - https://github.com/simonchuryakov/arduino-music-box/blob/master/docs/circuit_v1.jpg
+   2. v2 - https://github.com/simonchuryakov/arduino-music-box/blob/master/docs/circuit_v2.jpg
+
+## How to run
+
+To run the project you have to:
+
+1. Upload sketch file from `src/arduino/play.ino` to your Arduino Uno using Arduino IDE or whatever you use for arduino development
+2. Keep Arduino Uno connected to your computer
+3. Run in the terminal:
+
+```
+npm install
+node src/node/index.js
+```
+
+By default it will start playing files from `midi-storage` (you can change it in the `index.js`)