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

PCB design for testing signal connections and communication recovery
Switcher V0 is an open-source printed circuit board by Stavfe, from the Stavfe/4_wires_switcher repository on GitHub. It is a 2-layer board of 81.3 × 26.7 mm with 11 parts on 16 nets, routed with 20 tracks and 0 vias.
It is built around the SAJ101XBL0N74SNCPTQ and 195-4MST. Its parts include 5 switches and 2 connectors.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_2.1mm | H1, H2, H3, H4 |
| 4 | SAJ101XBL0N74SNCPTQ | SAJ101XBL0N74SNCPTQ:SAJ101XBL0N74SNCPTQ | SW2, SW3, SW4, SW5 |
| 2 | 691210910004 | 691210910004:691210910004 | J1, J2 |
| 1 | 195-4MST | Button_Switch_THT:SW_DIP_SPSTx04_Piano_CTS_Series194-4MSTN_W7.62mm_P2.54mm | SW1 |

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


FrameworkComputer/ExpansionCards
Reference designs and documentation to create Expansion Cards for the Framework Laptop

hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI

hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!


tardate/LittleArduinoProjects
a collection of "Little Electronic & Arduino Projects", most involving electronics or an Arduino in one way or another!

basilfx/TRADFRI-Hacking
Hacking IKEA TRÅDFRI products, such as light bulbs, window blinds and other accessories.
It measures 81.3 × 26.7 mm and has 2 copper layers, 1.6 mm thick.
11 parts, built around the SAJ101XBL0N74SNCPTQ and 195-4MST. 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 Stavfe/4_wires_switcher repository on GitHub, at the commit this page was made from: the board is Switcher V0/Switcher V0.kicad_pcb and its schematic Switcher V0/Switcher V0.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask Stavfe before reusing the design.