name: apc-code-samples description: TypeScript and Node.js code samples for APC Mini MK2 development. Use when user needs "code example", "implementation", "easymidi", "@julusian/midi", "sample code", "how to implement", or wants working code for LED control, button handling, or MIDI communication.

APC Mini MK2 Code Samples

Quick start examples. For complete implementation details, see reference.md.

Library Setup

# Rapid development
npm install easymidi && npm install -D @types/easymidi

# Production
npm install @julusian/midi

Basic Connection

import easymidi from 'easymidi';

const createConnection = () => ({
  output: new easymidi.Output('APC mini mk2'),
  input: new easymidi.Input('APC mini mk2')
} as const);

Set Pad Color

// Red at full brightness (channel 6)
const setPad = (output: Output, note: number, velocity: number, channel = 6): void =>
  output.send('noteon', { note, velocity, channel });

// Turn off
const setPadOff = (output: Output, note: number): void =>
  output.send('noteon', { note, velocity: 0, channel: 0 });

Handle Button Press

const onPadPress = (input: Input, callback: (pad: number) => void): void =>
  input.on('noteon', (msg) => {
    if (msg.note < 64 && msg.velocity > 0) callback(msg.note);
  });

const onTrackButton = (input: Input, callback: (track: number) => void): void =>
  input.on('noteon', (msg) => {
    if (msg.note >= 100 && msg.note <= 107) callback(msg.note - 99);
  });

const onSceneButton = (input: Input, callback: (scene: number) => void): void =>
  input.on('noteon', (msg) => {
    if (msg.note >= 112 && msg.note <= 119) callback(msg.note - 111);
  });

Handle Fader

const onFader = (input: Input, callback: (fader: number, value: number) => void): void =>
  input.on('cc', (msg) => {
    if (msg.controller >= 48 && msg.controller <= 56) {
      callback(msg.controller - 47, msg.value);
    }
  });

Custom RGB

const encodeRGB = (v: number): readonly [number, number] =>
  [(v >> 7) & 0x01, v & 0x7F] as const;

const setRGB = (output: Output, pad: number, r: number, g: number, b: number): void =>
  output.send('sysex', [
    0xF0, 0x47, 0x7F, 0x4F, 0x24, 0x00, 0x08,
    pad, pad, ...encodeRGB(r), ...encodeRGB(g), ...encodeRGB(b),
    0xF7
  ]);

Color Constants

const Colors = {
  OFF: 0, WHITE: 3, RED: 5, ORANGE: 9, YELLOW: 13,
  GREEN: 21, CYAN: 33, BLUE: 45, PURPLE: 49, MAGENTA: 53
} as const;