LED MØNSTER is a native macOS Bluetooth LED strip controller for compatible BJ_LED_M / MohuanLED RGB controllers. It combines momentary performance pads, QWERTY and MIDI input, mood lighting, colour effects, and a detailed Bluetooth connection view in one monster-themed interface.
| Download | Best for |
|---|---|
| LED Monster.dmg | Normal drag-to-Applications installation |
| LED Monster.zip | Portable archive containing the Mac app and usage guide |
| Source code | Building or reviewing the Swift source |
Current release: 0.15.1 build 25. Requires an Apple Silicon Mac and macOS 13 or later.
The downloadable app is ad-hoc signed for personal use and is not Apple-notarized. macOS may ask you to approve it the first time it opens.
- Controls compatible
BJ_LED_MBluetooth RGB LED strip controllers. - Provides nine momentary colour pads mapped to Q W E R T Y A S D.
- Accepts MIDI notes 60–68 on every MIDI channel and exposes a virtual MIDI output.
- Changes the monster eye to the active pad colour while the key or MIDI note is held.
- Includes Mood mode with Relax, Sunset, Ocean, Forest, Focus, and Midnight.
- Includes LED MØNSTER VFX with five flash/fade patterns, tap tempo, and a 16-colour palette.
- Includes a colour wheel, RGB controls, hex input, brightness, and saved scenes.
- Keeps scenes and diagnostic reports on the Mac with no account or telemetry.
- Download and open LED Monster.dmg.
- Drag LED MØNSTER.app into Applications.
- Power on the LED strip and close MohuanLED or any other app using the controller.
- Open LED MØNSTER, click the menu button in the top-left, and select Scan nearby.
- Choose the device named BJ_LED_M, click Connect, and close the menu.
- Hold a colour pad, its keyboard key, or its matching MIDI note. The light stays on until you release it.
Read How to use LED MØNSTER for connection help, controls, MIDI mapping, Mood mode, VFX, and troubleshooting.
| Key | Colour | MIDI note |
|---|---|---|
| Q | Red | 60 |
| W | Green | 61 |
| E | Blue | 62 |
| R | Yellow | 63 |
| T | Cyan | 64 |
| Y | Magenta | 65 |
| A | Orange gradient midpoint | 66 |
| S | Spring-green gradient midpoint | 67 |
| D | Violet gradient midpoint | 68 |
- LED MØNSTER — momentary colour pads with keyboard and MIDI control.
- LED MØNSTER VFX — automatic flash, jump, fade, and BPM-synchronised effects.
- Mood mode — slow ambient crossfades with six curated atmospheres.
- Colour studio — colour wheel, RGB/hex values, brightness, and saved scenes.
- Connection details — discovered GATT services, characteristics, values, and activity logs.
LED MØNSTER intentionally restricts control writes to devices that match the verified profile:
- Advertised name:
BJ_LED_M - BLE service:
EEA0 - Writable command characteristic:
EE01 - Colour and power packets: documented in PROTOCOL.md
Other Bluetooth LED controllers may appear during scanning, but this build does not send control packets to them. The app cannot read back the strip's actual colour or power state.
You need an Apple Silicon Mac, macOS 13+, and Apple Command Line Tools.
git clone https://github.com/DontxSleep/LED-Monster.git
cd LED-Monster
bash build.shThe app is created at artifacts/LED MØNSTER.app.
To build a verified disk image:
bash scripts/build-dmg.shThe DMG is created at artifacts/LED Monster.dmg.
LED MØNSTER runs locally. It has no login, cloud backend, advertising, analytics, or telemetry. Bluetooth reports exported from Connection details can contain nearby device identifiers; review a report before sharing it.
This is an independent interoperability project for personally owned hardware. It is not affiliated with or endorsed by the manufacturer of MohuanLED or BJ_LED controllers.