2 layers44.5 × 46.9 mm
OSO SWAT B1-jig
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
31 parts2.1k
2 layers76.5 × 70.7 mm
a project that bridges connections across borders!
- Size
- 76.5 × 70.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 56
- Pads
- 125
- Tracks, vias
- 280, 49
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Jun 2026
- Updated
- 21 Jun 2026
Overview
Sme is an open-source printed circuit board by robertshepherdcpp, from the robertshepherdcpp/sme repository on GitHub. It is a 2-layer board of 76.5 × 70.7 mm with 31 parts on 56 nets, routed with 280 tracks and 49 vias.
Its parts include 14 resistors, 10 diodes, 3 capacitors, 2 ICs and 1 connector. It belongs with the ESP32 and RISC-V boards of this library.
README
README.mdSME (as in same)
motivation
- i thought it would be cool to have a thing with ur friends/family where u can know ur thinking of each other at the same time no matter the location in a physical thing. not just test.
what is it? / how does it work
- you will have one and another person will have one
- when u press the button on each of ur own projects, a sound will play!
- using adafruit api
assembly instructions
- purchase all the things detailed in the BOM.csv file in this repository
- then print out the case and the pcb
- get an sd card, and save the audio file in this repository (or one of your choice!) to it.
- then insert it into the holder in the pcb.
- then insert the pcb into the case
- put the lid on
- then screw in using the 3 screws going through.
- then you can plug the esp32 (at the bottom of the case) into a computer
- and then you need to configure your api keys etc in the firmware.
- then flash the firmware! (easiest way to do this is using the arduino ide)
- then u can connect with another project!
- have fun!
pcb
schematic:
pcb wiring:
3d model:
cad:
BOM:
Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 |
| 10 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R11, R14 |
| 2 | R | Resistor_SMD:R_0603_1608Metric | R12, R13 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | MCP23017_SP | Package_DIP:DIP-28_W7.62mm | U2 |
| 1 | SD_Card_Receptacle | Connector_Card:microSD_HC_Molex_104031-0811 | J1 |
| 1 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1 |
| 1 | XIAO-ESP32-C6-SMD | Seeed Studio XIAO Series Library:XIAO-ESP32-C6-SMD | U1 |
Questions
How big is the Sme PCB?
It measures 76.5 × 70.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sme use?
31 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 Sme KiCad files?
From the robertshepherdcpp/sme repository on GitHub, at the commit this page was made from: the board is PCB/sme.kicad_pcb and its schematic PCB/sme.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sme design in my own project?
Its repository states no licence, so its author keeps all rights: ask robertshepherdcpp before reusing the design.
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