2 layers52.2 × 52.2 mm
Base promicro
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
30 parts3kApache-2.0
2 layers68.6 × 53.3 mm
Particle somduino
epietrowicz/particle-somduino2The cost of the example design is $54.88 for 5 mostly assembled boards. All that remains is a Particle SoM and power module.
- Size
- 68.6 × 53.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 78
- Pads
- 210
- Tracks, vias
- 562, 110
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Dec 2024
- Updated
- 5 Feb 2025
Overview
Particle somduino is an open-source printed circuit board by epietrowicz, from the epietrowicz/particle-somduino repository on GitHub. It is a 2-layer board of 68.6 × 53.3 mm with 30 parts on 78 nets, routed with 562 tracks and 110 vias.
Its parts include 10 resistors, 8 connectors, 3 switches, 2 ICs and 2 diodes.
README
README.mdSomduino
This is a sample design for a mostly assembled PCB from a manufacturing service like JLCPCB, helping you get started with a custom SoM based design. The Somduino is an Arduino Uno form factor breakout board intended to work with either BSoM or MSoM Particle products.
Overview
The SoMduino has the following features:
- USB Type C connector for programming
- This development board cannot be powered via USB and will require either a LiPo battery or a DC barrel jack connection.
- ON / OFF switch
- Mode & Reset switches
- RGB LED indicator
- 5-17V DC barrel jack connector for battery charging and normal operation
- Qwiic connector for I2C expansion
- Charging indicator LED
- Arduino Uno form factor for Arduino shield compatibility
BOM
You can find a complete list of LCSC parts used in the example design below:
| Designator | Quantity | Comment | LCSC Part # |
|---|---|---|---|
| D1 | 1 | LED RGB | C5342281 |
| D2 | 1 | LED Charging | C2297 |
| H1 | 1 | Threaded standoff | C2916321 |
| J1, J4 | 2 | 1x08 Header | C27438 |
| J2 | 1 | 1x10 Header | C5116489 |
| J3 | 1 | 1x06 Header | C40877 |
| J5 | 1 | Barrel Jack Power In | C720557 |
| J6 | 1 | 1x02 Battery connector | C295747 |
| J7 | 1 | 1x04 Qwiic connector | C160390 |
| J8 | 1 | USB-C connector | C5362630 |
| R1, R2, R3, R5 | 4 | 1k 0603 resistor | C21190 |
| R10, R9 | 2 | 5.1k 0603 resistor | C23186 |
| R4, R8 | 2 | 10k 0603 resistor | C15401 |
| R6, R7 | 2 | 4.7k 0603 resistor | C23162 |
| SW1, SW2 | 2 | Push button switch | C318884 |
| SW3 | 1 | Power switch | C963205 |
| U1 | 1 | M.2 connector for SoM | C2977809 |
The cost of the example design is $54.88 for 5 mostly assembled boards. All that remains is a Particle SoM and power module. It is worth noting that I did not choose to upgrade from the “economic assembly” for the threaded standoff and plan to hand assemble that component saving $25.
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R5 |
| 4 | MountingHole_3.2mm | Arduino_MountingHole:MountingHole_3.2mm | MH1, MH2, MH3, MH4 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R4, R8 |
| 2 | 1x08 | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1, J4 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R9, R10 |
| 2 | SW_Push | Somduino_Footprints:SW_Push_1P1T_XKB_TS-1187A | SW1, SW2 |
| 1 | 1x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J3 |
| 1 | 1x10 | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J2 |
| 1 | BSoM404 | Somduino_Footprints:SoM_M2_Connector | U1 |
| 1 | Barrel_Jack_Switch | Somduino_Footprints:DC-005-A200 | J5 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal | J6 |
| 1 | Conn_01x04 | Connector_JST:JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical | J7 |
| 1 | G_Switch_DPDT | Somduino_Footprints:G-Swtich_SW_DPDT | SW3 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | LED_RGB | Somduino_Footprints:LED_RGB_Wuerth-PLCC4_3.2x2.8mm_150141M173100 | D1 |
| 1 | MountingHole_Pad | Somduino_Footprints:SoM_SMD_ThreadedStandoff | H1 |
| 1 | PM-BAT | Somduino_Footprints:ParticlePowerModuleSMD | U2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Somduino_Footprints:USB_C_Receptacle_G-Switch_GT-USB-7010i | J8 |
Questions
How big is the Particle somduino PCB?
It measures 68.6 × 53.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Particle somduino use?
30 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.
Where can I download the Particle somduino KiCad files?
From the epietrowicz/particle-somduino repository on GitHub, at the commit this page was made from: the board is particle-somduino.kicad_pcb and its schematic particle-somduino.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Particle somduino design in my own project?
Its repository states no licence, so its author keeps all rights: ask epietrowicz before reusing the design.
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