2 layers89.5 × 31 mm
Flowing dongle
ugokutennp/flowing-dongle-ccd
DIY Multiple Connection Watchman Dongle for SteamVR
36 parts73MIT
4 layers40 × 30 mm
Door sensor
AndersFrandsen/door-sensor-hardwareKiCad design for the Matter Over Thread Door Sensor project.
- Size
- 40 × 30 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 38
- Pads
- 101
- Tracks, vias
- 173, 38
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Jun 2026
- Updated
- 19 Jun 2026
Overview
Door sensor is an open-source printed circuit board by AndersFrandsen, from the AndersFrandsen/door-sensor-hardware repository on GitHub. It is a 4-layer board of 40 × 30 mm with 27 parts on 38 nets, routed with 173 tracks and 38 vias.
It is built around the MS88SF2, AP2112K-3.3 and BAT54C. Its parts include 5 capacitors, 5 resistors, 3 connectors, 2 ICs and 2 diodes. It belongs with the sensors and measurement boards of this library.
Main components
3MS88SF2
SMD,17.4x23.2mmSMD,17.4x23.2mm Bluetooth Modules ROHSMINEWBluetooth Modules
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
BAT54C
SOT-231 Pair Common Cathode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.mdHardware
KiCad design for the Matter Over Thread Door Sensor project.
Overview
A door sensor PCB that uses the MS88SF2 Radio-module (Nordic nRF52840) to detect door open/close events via a reed switch and send them over a Thread network using the Matter protocol.
Board
- Size: 40 × 30 mm
- Layers: 4 (F.Cu signal, In1.Cu GND plane, In2.Cu power plane, B.Cu signal)
- Thickness: 1.6 mm
- Version: HW v1.0
Power
The board supports two power sources, OR-ed by a BAT54C Schottky diode (D2):
- USB-C (P1 — GCT USB4135-GF-A) — 5V input via USB (power only)
- Battery (BT1 — CR2032 coin cell, holder 36-3034-ND)
The AP2112K-3.3 LDO (U2) regulates the USB supply to 3.3 V before it is OR-ed with the battery by the BAT54C. Because the battery runs at ~3 V, the regulated USB rail always wins, ensuring that flashing and debugging draw from USB rather than the battery.
Bill of Materials
| Ref | Qty | Value / Part | Description |
|---|---|---|---|
| BT1 | 1 | 36-3034-ND | CR2032 coin cell holder |
| C1, C2 | 2 | 1 µF | Decoupling capacitor |
| C3 | 1 | 10 µF | Bulk decoupling capacitor |
| C4, C5 | 2 | 100 nF | Decoupling capacitor |
| D1 | 1 | LED | Status LED |
| D2 | 1 | BAT54C-E3-08CT-ND | Dual Schottky diode |
| J1 | 1 | FTSH-107-01-F-DV-K-P-TR | SWD/JTAG/UART debug header |
| J2 | 1 | JST SH SM02B-SRSS-TB | Reed switch connector |
| P1 | 1 | GCT_USB4135-GF-A | USB-C receptacle |
| R1 | 1 | 1 K | LED current limiting resistor |
| R2, R3 | 2 | 5.1 K | USB-C CC pull-down resistors |
| R4 | 1 | 10 K | Pull resistor |
| R7 | 1 | 1 M | Pull resistor |
| SW1 | 1 | SW_Push | Reset / user button |
| U2 | 1 | AP2112K-3.3TRG1DICT-ND | 600 mA 3.3 V LDO regulator, SOT-23-5 |
| U3 | 1 | MS88SF2 | Radio module (Nordic nRF52840) |
Schematic
PCB
| Front | Back |
|---|---|
 |  |
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_2.1mm | H1, H2, H3, H4 |
| 4 | ~ | TestPoint:TestPoint_Pad_D1.5mm | BATT, GND, USB, VCC |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C5 |
| 2 | 1µF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 2 | 5K1 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3 |
| 1 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 10µF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | BAT54C | Package_TO_SOT_SMD:SOT-23 | D2 |
| 1 | Battery | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | MS88SF2 | MS88SF2:XCVR_MS88SF2 | U3 |
| 1 | Reed_SW | Connector_JST:JST_SH_SM02B-SRSS-TB_1x02-1MP_P1.00mm_Horizontal | J2 |
| 1 | STDC14 | Connector_PinHeader_1.27mm:PinHeader_2x07_P1.27mm_Vertical_SMD | J1 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_PTS647_Sx38 | SW1 |
| 1 | USB-C | Connector_USB:USB_C_Receptacle_GCT_USB4135-GF-A_6P_TopMnt_Horizontal | P1 |
Questions
How big is the Door sensor PCB?
It measures 40 × 30 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Door sensor use?
27 parts, built around the MS88SF2, AP2112K-3.3 and BAT54C. 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 Door sensor KiCad files?
From the AndersFrandsen/door-sensor-hardware repository on GitHub, at the commit this page was made from: the board is door-sensor.kicad_pcb and its schematic door-sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Door sensor design in my own project?
Its repository states no licence, so its author keeps all rights: ask AndersFrandsen before reusing the design.
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