Madpad

Custom macropad based on RP2040 with display, audio feedback, and per-key RGB lighting.
Designed as a versatile input device for PC with extra features for interaction and visualization.

What’s on the board

• RP2040 microcontroller
  • USB device (HID, MIDI, or custom protocols)
• IPS display (0.96")
  • Controller: ST7735
  • For status output, macro layers, menus, or visual effects
• Microphone: INMP441ACEZ-R7 (I²S interface)
• Piezo buzzer with transistor driver for sound feedback
• Rotary encoder with integrated push button
• 8 mechanical keys (macro switches)
• RGB lighting:
  • 1× WS2812 (1×1 mm) LED per key
  • Additional WS2812 LEDs distributed across the board for ambient light effects

Connectivity

• USB Type-C for both power and PC connection
• Enumerates as USB HID keyboard/macropad (firmware-dependent)
• Can be extended to MIDI control surface or custom USB interfaces

Use Cases

• Macro pad for productivity (shortcuts, hotkeys, macros)
• Custom controller for audio/video editing software
• Mini MIDI controller for music applications
• Experiment platform for RGB effects + input devices

Notes

• LED layout allows both per-key lighting and global light animations.
• Buzzer and microphone make the board suitable for interactive feedback or audio experiments.
• Rotary encoder + display add flexibility for menus, layers, or volume control.