A minimal 9-key macropad with rotary encoder. Custom PCB, XIAO RP2040, KMK firmware.
| MCU | Seeed XIAO RP2040 |
| Switches | 9× MX-compatible (3×3 matrix) |
| Encoder | 1× rotary with push switch |
| Display | None |
| Bluetooth | No |
| Connector | USB-C |
| Firmware | KMK on CircuitPython |
| PCB | Custom, KiCad |
CELLA [V][T][K]E[E#]D[D#]B[B#][CON][CASE]
| Code | Meaning | Values |
|---|---|---|
V |
Version | 1, 2, 3... |
T |
Type | M Macro · N Numpad · D Dial |
K |
Key count | 9, 12, 16... |
E# |
Encoder | E1 yes · E0 no |
D# |
Display | D1 yes · D0 no |
B# |
Bluetooth | B1 yes · B0 no |
CON |
Connector | UC USB-C · UM Micro-B |
CASE |
Case | C clear · B black · W white · X no case |
Example: CELLA 1M9E1D0B0UCX — Version 1, Macro, 9 keys, 1 encoder, no display, no bluetooth, USB-C, no case.
© 2025 Faizeen Hoque
