HardLabs

Dormouse

temonuv·dormouse·hardware/mgm210l_sensor.kicad_pcb

Dormouse PCB layout, top view — open source Silicon Labs board by temonuv
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About the Dormouse PCB

Dormouse is an open source Silicon Labs PCB design by temonuv, published on GitHub under the MIT license. It is a 2-layer board measuring 36 × 25.1 mm, with 9 components from 7 distinct parts.

Its main chip is the MGM210LA22JNF, from the Silicon Labs family. Other key parts include the SHT40. By type, the board carries 3 capacitors, 2 ICs, 2 resistors, 1 connector and 1 battery holder.

It belongs with the sensors, iot & wireless and power & battery designs in this gallery.

From the project

🐭 Dormouse — a coin-cell (CR2032) Zigbee 3.0 temperature + humidity sensor on the Silicon Labs MGM210L (EFR32MG21). Firmware + KiCad hardware + Home Assistant integration.

KiCad 8/9 design for Dormouse, the MGM210L CR2032 temperature + humidity sensor. The schematic (electrical connectivity) and the routed PCB are both here. (File basenames stay mgm210lsensor.*` — renaming a finalized, already-ordered KiCad project risks breaking internal references for no functional gain.)

The PCB is not regenerated by a script — it is built from the schematic with KiCad's "Update PCB from Schematic" (F8) and then edited. Do not expect gen.py` to touch it.

Main components on the Dormouse

MGM210LA22JNFSHT40

Dormouse bill of materials (BOM)

9 components, 7 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MGM210LA22JNF
U1
1
SHT40
U2
1
GND RES DIO CLK VDD
J1
1
CR2032
BT1
1
10uF
C1
2
100nF
C2, C3
2
4.7k
R1, R2

Dormouse design files

The KiCad project lives in the temonuv/dormouse repository on GitHub; these links point at the commit this page was built from.

Dormouse: common questions

What microcontroller does the Dormouse use?

The Dormouse is built around the MGM210LA22JNF, from the Silicon Labs family.

How big is the Dormouse PCB?

The Dormouse measures 36 × 25.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dormouse?

9 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Dormouse design files?

From the temonuv/dormouse repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Dormouse design in my own project?

Yes, under the terms of its MIT license, which temonuv chose for the repository.

Can I test firmware for the Dormouse without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Silicon Labs firmware against it before you order a PCB.

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