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google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards

This macropad has 9 keys, an OLED display, a rotary encoder, and 20 individually adressable LEDs for an underglow effect.
Macropad is an open-source printed circuit board by ZSmaster1, from the ZSmaster1/macropad repository on GitHub, published under the MIT licence. It is a 2-layer board of 80 × 83 mm with 54 parts on 45 nets, routed with 250 tracks and 24 vias.
It is built around the SK6812MINI-E. Its parts include 29 diodes, 10 capacitors, 10 switches, 1 IC and 1 connector. It belongs with the keyboards and input boards of this library.
This macropad has 9 keys, an OLED display, a rotary encoder, and 20 individually adressable LEDs for an underglow effect.
The PCB gets sandwiched in between the main body and the bottom piece. The PCB can be glued using the 4 corners onto the main body or foam or some kind of riser can be placed on the protruding columns on the bottom plate. When the bottom plate is glued to the main body the column will snugly fix the PCB in place. This allows the case to stay slim and compact while still allowing the underglow effect to take place.

Made in Fusion 360. Make sure the macropad works outside the case before assembling the case since it will be very hard to take it apart.
The PCB was made in KiCad, it incorporates 2 layers, a ground plane, and vias.

Currently the firmware is designed to use KMK and circuitpython. However in the future I would like to upgrade to QMK due to its gui configuration interface and more advanced features.
Everyting you need to make this macropad:
| Part | Quantity | Optional |
|---|---|---|
| Cherry MX switches | 9 | |
| DSA keycaps | 9 | |
| 1N4148 DO-35 diode | 9 | |
| SK6812MINI-E LED | 20 | |
| 0.91" 128x32 i2c OLED Display | 1 | |
| EC11 Rotary Encoder | 1 | |
| XIAO RP2040 microcontroller | 1 | |
| PCB | 1 | |
| Case - top | 1 | |
| Case - bottom | 1 | |
| 100nf through-hole capacitor | 10 | yes |
Right now the capacitors were added into the PCB just in case there are any issues with voltage drops due to the amount of LEDs.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | SK6812MINI-E | LED_SMD:LED_SK6812MINI-E_3.2x2.8mm_P1.5mm_ReverseMount | D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25 +4 |
| 10 | 100nf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 |
| 9 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9 |
| 9 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 |
| 1 | MOUDLE-SEEEDUINO-XIAO | carepackage:XIAO-Generic-Hybrid-14P-2.54-21X17.8MM | U2 |
| 1 | OLED_Header | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW10 |
The 51 most common of 54 parts.
It measures 80 × 83 mm and has 2 copper layers, 1.6 mm thick.
54 parts, built around the SK6812MINI-E. 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.
From the ZSmaster1/macropad repository on GitHub, at the commit this page was made from: the board is pcb/macropad.kicad_pcb and its schematic pcb/macropad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
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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