8/10 Leonardo (ATmega32u4 HID)
Makers comfortable with the Arduino IDE who want full control over a custom helm and button box on a sub-$30 board.
The flexible, code-it-yourself route to a DIY helm. The Leonardo's ATmega32u4 has native USB, so with the open-source ArduinoJoystickLibrary it presents to the PC as a real HID joystick — your pots and switches read as genuine axes and buttons. Versus the no-code BU0836A, the trade is effort for control: you write a sketch and calibrate, but you get logic the dedicated board can't do (custom button matrices, software detents, encoder handling, combining a helm with a button box on one cheap board). The honest caveat is purely DIY — there's no enclosure, no lever feel, and you'll spend time in the IDE — but at ~$25 (less for a Pro Micro clone) it's the cheapest custom-controller foundation in the bay.
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Specs
| mcu | ATmega32u4, 16 MHz, native USB HID |
|---|---|
| io | 20 digital I/O (7 PWM), 12 analog inputs |
| library | ArduinoJoystickLibrary (open source) for HID joystick |
| connection | Micro USB |
| alternatives | Pro Micro / Micro clones use the same chip for less |
| marineRole | Programmable DIY HID helm / button box |
Pros
- Presents as a true HID joystick — pots and switches read as real axes/buttons
- Cheapest custom-controller base; clones (Pro Micro) cost a few dollars
- Code flexibility: button matrices, software detents, encoders, combined helm + button box
Cons
- Requires coding and calibration — not no-code like the BU0836A
- Only 12 analog inputs and you build all the hardware around it
- No enclosure, levers, or lever feel — it's a bare board, fully DIY
