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

A 'meishi'-sized experimental 4-keypad with audio-sync lightshow
Switch42 is an open-source printed circuit board by zk-phi, from the zk-phi/KP-19 repository on GitHub. It is a 2-layer board of 91 × 55 mm with 35 parts on 44 nets, routed with 531 tracks and 14 vias.
It is built around the SK6812MINI-E. Its parts include 19 inductors, 5 switches, 3 connectors, 2 resistors and 1 capacitor. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | SK6812MINI | phi-kbd-library:SK6812SIDE-irreversible | L2, L4, L6, L8, L10, L11, L12, L13, L14, L15 |
| 5 | SK6812MINI | phi-kbd-library:SK6812MINI-underglow-irreversible | L1, L3, L5, L7, L9 |
| 4 | SK6812MINI | phi-kbd-library:SK6812MINI-irreversible | L16, L17, L18, L19 |
| 4 | SW_PUSH | phi-kbd-library:MX_1.00u-irreversible | SW1, SW2, SW4, SW5 |
| 2 | MJ-4PP-9 | phi-kbd-library:MJ-4PP-9-irreversible | J2, J3 |
| 2 | R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2 |
| 1 | C | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | Conn_01x02 | phi-kbd-library:2pads | J1 |
| 1 | D | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D1 |
| 1 | LOGO | paripi:Untitled | G*** |
| 1 | LOGO | paripi:Untitled2 | G*** |
| 1 | ProMicro | phi-kbd-library:ProMicro_Reversed_Conthrough-irreversible | U1 |
| 1 | Q_NPN_ECB | Package_TO_SOT_THT:TO-92 | Q1 |
| 1 | SW_PUSH | phi-kbd-library:ResetSW-irreversible | SW7 |
It measures 91 × 55 mm and has 2 copper layers, 1.6 mm thick.
35 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 zk-phi/KP-19 repository on GitHub, at the commit this page was made from: the board is pcb/switch42.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask zk-phi before reusing the design.

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

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