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

Water Level Controller using 555 Timer
SPS-9244-Water Level Controller using-555-Timer is an open-source printed circuit board by smartinternz02, from the smartinternz02/SPS-9244-Water-Level-Controller-using-555-Timer repository on GitHub. It is a 2-layer board of 34.3 × 24.1 mm with 11 parts on 8 nets, routed with 82 tracks and 0 vias.
Its parts include 4 resistors, 2 diodes, 1 capacitor and 1 IC.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 150K 1206 | Resistor_SMD:R_1206_3216Metric | R3, R4 |
| 2 | 470E 1206 | Resistor_SMD:R_1206_3216Metric | R1, R2 |
| 2 | LED | LED_SMD:LED_1206_3216Metric | D1, D2 |
| 1 | +9v vcc | TestPoint:TestPoint_Pad_D4.0mm | vcc1 |
| 1 | 10ufd/16V | Capacitor_SMD:CP_Elec_6.3x5.2 | C1 |
| 1 | GND | TestPoint:TestPoint_Pad_D4.0mm | GND1 |
| 1 | LM555 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
The 10 most common of 11 parts.

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


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hackclub/OnBoard
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basilfx/TRADFRI-Hacking
Hacking IKEA TRÅDFRI products, such as light bulbs, window blinds and other accessories.
It measures 34.3 × 24.1 mm and has 2 copper layers, 1.6 mm thick.
11 parts. 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 smartinternz02/SPS-9244-Water-Level-Controller-using-555-Timer repository on GitHub, at the commit this page was made from: the board is test.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 smartinternz02 before reusing the design.