2 layers181 × 97 mm
OpenDeck r3.1.2
shanteacontrols/OpenDeck
A platform for building interactive control and sensing devices using MIDI and OSC built with Zephyr RTOS.
262 parts960Apache-2.0
2 layers152.4 × 118.8 mm
Single Microcontroller
BBRRE/Single-Microcontroller-Split-Keyboard-SMCKDesign for a split keyboard that only uses a singular microcontroller, passive side uses a cascade of shift registors to send data through a singular serial wire leaving the 2 sides connected by only 5 wires (GND, VCC, CLK, PL, DATA))
- Size
- 152.4 × 118.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 56
- Pads
- 321
- Tracks, vias
- 535, 6
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 29 Jul 2026
- Updated
- 29 Jul 2026
Overview
Single Microcontroller is an open-source printed circuit board by BBRRE, from the BBRRE/Single-Microcontroller-Split-Keyboard-SMCK repository on GitHub, published under the MIT licence. It is a 2-layer board of 152.4 × 118.8 mm with 29 parts on 56 nets, routed with 535 tracks and 6 vias.
It is built around the 74HC165D. Its parts include 17 switches, 4 capacitors, 4 ICs and 1 connector. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
1README
README.mdSingle-Microcontroller-Split-Keyboard-SMCK
Design for a split keyboard that only uses a singular microcontroller, passive side uses a cascade of shift registors to send data through a singular serial wire leaving the 2 sides connected by only 5 wires (GND, VCC, CLK, PL, DATA)
Schematics
Front of the PCB
Back of the PCB
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | Keyswitch | keyswitches.pretty-2.1:SW_MX_reversible | S1, S2, S3, S4, S5, S6, S7, S8, S10, S11, S12, S13, S14, S15, S16, S17 +1 |
| 4 | C | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4 |
| 3 | R_Pack08 | Package_DIP:DIP-16_W7.62mm | RN1, RN2, RN3 |
| 2 | 74HC165 | Package_DIP:DIP-16_W7.62mm_LongPads | U2, U3 |
| 1 | 74HC165 | Package_DIP:DIP-16_W7.62mm | U1 |
| 1 | Pico | Library:RPi_Pico_SMD_TH | U4 |
| 1 | RJ12 | Connector_RJ:RJ12_Amphenol_54601-x06_Horizontal | J1 |
Questions
How big is the Single Microcontroller PCB?
It measures 152.4 × 118.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Single Microcontroller use?
29 parts, built around the 74HC165D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Single Microcontroller KiCad files?
From the BBRRE/Single-Microcontroller-Split-Keyboard-SMCK repository on GitHub, at the commit this page was made from: the board is Single Microcontroller/Single Microcontroller.kicad_pcb and its schematic Single Microcontroller/Single Microcontroller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Single Microcontroller design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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