4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers20.8 × 27.6 mm
MmWave playkit
m1cha3l-s/mmWave[WIP] mmwave sensing project using seeedstudio 24GHz mmwave sensor and xiao esp32-s3
- Size
- 20.8 × 27.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 4
- Nets
- 16
- Pads
- 36
- Tracks, vias
- 23, 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 Mar 2026
- Updated
- 21 Apr 2026
Overview
MmWave playkit is an open-source printed circuit board by m1cha3l-s, from the m1cha3l-s/mmWave repository on GitHub. It is a 2-layer board of 20.8 × 27.6 mm with 4 parts on 16 nets, routed with 23 tracks and 3 vias.
It is built around the SK6812MINI-E. Its parts include 2 diodes and 1 IC. It belongs with the ESP32 boards of this library.
Main components
1README
README.mdmmWave playKit
mmwave sensing project using seeedstudio 24GHz mmwave sensor and xiao esp32-s3
Firmware notice
The included firmware is not fine tuned as of now because this project isn't built in real life as of yet. Also the included firmware is for controlling a different project of mine Remote Occupancy Indicator. The idea behind this project is to explore what's possible with this and try it in real world conditions so that you can have a better idea in which scenarios this sensor is usefull and in which it would lack functionality, with this idea comes the need of your own firmware to use it in your situation!
Case notice
As of right now I don't have the parts on hand so I can't make the case. Without the sizes making a case at this point in making would be pointless. I have done my research tho and I know the headers and everything should be possible to fit. If I am mistaken then I take it as my mistake and will redo and order the stuff myself if needed.
Building
- Solder the headers included with the module together with the PCB and ESP32. (Make sure the headers are on the sides with the silkscreen text)
- Solder the headers from the ESP32 onto the module.
- Solder the LEDs onto the PCB.
- Connect the module to the headers on the PCB.
- Place it inside the optional 3D Printed case.
- Now you are finished!!!
This is how it should be looking together
Flashing (Sensor for Remote Occupancy Indicator)
- Flash the MAC-Finder in Arduino IDE (It can be found in the folder with the firmware).
- Look into the serial monitor and write down the MAC address. (We will need this to be able to communicate with the Indicator.
- For this demo to work we will need to reflash the Indicator with the MAC of the sensor.
- After doing that flash the sensor with the MAC of the indicator.
- Now you are finished!!! The sensor and indicator will connect automatically.
PCB/Schematic
BOM
| Part Name | Quantity | Price (USD) | Total (USD) | Link |
|---|---|---|---|---|
| XIAO ESP32-S3 | 1 | 10 | 10 | https://botland.cz/moduly-wifi-a-bt-esp32/22878-seeed-xiao-esp32-s3-wifi-bluetooth-seeedstudio-113991114.html |
| 24Ghz mmwave seeedstudio sensor | 1 | 6.70 | 6.70 | https://botland.cz/pohybove-senzory/24129-human-static-presence-mmwave-24ghz-senzor-pro-seeed-xiao-seeedstudio-101010001.html |
| botland shipping | 1 | 3.60 | 3.60 | |
| Custom PCB (with shipping) | 1 | 4.36 | 4.36 | jlcpcb |
| 3D Printed case | 1 | 0 | 0 | none - I have my own printer |
| Total | 24.66 |
Parts
4| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | SK6812MINI-E | care package:SK6812MINI-E_fixed | D1, D2 |
| 1 | XIAO-ESP32-S3-DIP | Seeed Studio XIAO Series Library:XIAO-ESP32S3-DIP | U1 |
| 1 | github.com/m1cha3l-s | Symbol:github-qr | QR***** |
Questions
How big is the MmWave playkit PCB?
It measures 20.8 × 27.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MmWave playkit use?
4 parts, built around the SK6812MINI-E. 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 MmWave playkit KiCad files?
From the m1cha3l-s/mmWave repository on GitHub, at the commit this page was made from: the board is KiCad/mmWave playkit.kicad_pcb and its schematic KiCad/mmWave playkit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MmWave playkit design in my own project?
Its repository states no licence, so its author keeps all rights: ask m1cha3l-s before reusing the design.
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