4 layers99.8 × 99.8 mm
2 layers99.8 × 99.8 mm
SomaButton
graysonarts/somaSociety's Obedience through Managed Audio
- Size
- 99.8 × 99.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 71
- Pads
- 163
- Tracks, vias
- 196, 8
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 May 2025
- Updated
- 3 Oct 2026
Overview
SomaButton is an open-source printed circuit board by graysonarts, from the graysonarts/soma repository on GitHub. It is a 2-layer board of 99.8 × 99.8 mm with 18 parts on 71 nets, routed with 196 tracks and 8 vias.
It is built around the ULN2803A. Its parts include 7 connectors, 3 capacitors, 2 resistors, 2 ICs and 2 diodes.
Main components
1Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1uF | Capacitor_SMD:C_1206_3216Metric | C1, C2, C3 |
| 2 | 4.7K | Resistor_SMD:R_1210_3225Metric | R1, R2 |
| 2 | D_Schottky | Diode_SMD:D_1210_3225Metric | D1, D3 |
| 2 | ULN2803A | Package_SO:SOIC-18W_7.5x11.6mm_P1.27mm | U2, U3 |
| 1 | 220 | Resistor_THT:R_Array_SIP13 | RN1 |
| 1 | BTN GND | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-12-2.54_1x12_P2.54mm_Horizontal | J3 |
| 1 | Buttons | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-12-2.54_1x12_P2.54mm_Horizontal | J6 |
| 1 | I2C | Connector_JST:JST_EH_S4B-EH_1x04_P2.50mm_Horizontal | J4 |
| 1 | LED GND | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-12-2.54_1x12_P2.54mm_Horizontal | J2 |
| 1 | LED+ | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-12-2.54_1x12_P2.54mm_Horizontal | J1 |
| 1 | V12 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J5 |
| 1 | V5 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J7 |
| 1 | ~ | CustomParts:Pico-W Socket | M1 |
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Questions
How big is the SomaButton PCB?
It measures 99.8 × 99.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SomaButton use?
18 parts, built around the ULN2803A. 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 SomaButton KiCad files?
From the graysonarts/soma repository on GitHub, at the commit this page was made from: the board is hardware/SomaButton/SomaButton.kicad_pcb and its schematic hardware/SomaAudio/SomaAudio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SomaButton design in my own project?
Its repository states no licence, so its author keeps all rights: ask graysonarts before reusing the design.