4 layers
BLDCM Power
brenocq/bldc-motor
High-precision BLDC motor and controller development from scratch (in progress...)
60 parts13MIT
2 layers49.3 × 22.4 mm
The electronics for Sentinel
- Size
- 49.3 × 22.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 20
- Pads
- 44
- Tracks, vias
- 74, 5
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Jan 2026
- Updated
- 7 Mar 2026
Overview
Sentinel is an open-source printed circuit board by LocalizedTech, from the LocalizedTech/sentinel-electronics repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 49.3 × 22.4 mm with 10 parts on 20 nets, routed with 74 tracks and 5 vias.
It is built around the HLK-LD2410S and LDLN030G33R. Its parts include 4 capacitors, 3 ICs, 1 resistor and 1 connector. It belongs with the nRF52 and nRF5x boards of this library.
Main components
2HLK-LD2410S
Through hole- Lack of specifications ROHSHI-LINKUncategorised
LDLN030G33R
TSOT-23-5-40℃~+125℃@(Tj) 1 150mV@(300mA) 16uA 3.3V 300mA 5.5V 7.5uVrms 80dB@(100Hz) Fixed Positive Under Voltage Lockout、PG Pin、Over Current Protection、Over Temperature Protection、Soft Start、Enable TSOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdSentinel Electronics
This is the electronics for Sentinel, an open-source mmWave presence sensor using Matter over Thread.
Prerequisites
- KiCad 9.0
Licensing
The project is primarily licensed under CERN-OHL-S v2.0 (see LICENSE in root), except for the files noted below.
The following files are licensed under Creative Commons Attribution-ShareAlike 4.0 International (CC-BY-SA-4.0). Attribution should be given to Seeed-Studio OPL_Kicad_Library.
footprints.pretty/XIAO-nRF52840-SMD-cutout.kicad_mod(has been modified)symbols/XIAO-nRF52840.kicad_sym
Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | HLK-LD2410S | Sentinel:HLK_LD2410S | U3 |
| 1 | JST_PH | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1 |
| 1 | LDLN030G33R | Sentinel:ST_LDLN030G33R_TSOT23 | U2 |
| 1 | XIAO-nRF52840-SMD | Sentinel:XIAO-nRF52840-SMD-cutout | U1 |
The 9 most common of 10 parts.
Questions
How big is the Sentinel PCB?
It measures 49.3 × 22.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sentinel use?
10 parts, built around the HLK-LD2410S and LDLN030G33R. 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 Sentinel KiCad files?
From the LocalizedTech/sentinel-electronics repository on GitHub, at the commit this page was made from: the board is sentinel.kicad_pcb and its schematic sentinel.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sentinel design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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