HardLabs

Core

PolygonHJ·xihe·hardware/core/core.kicad_pcb

Core PCB layout, top view — open source Nordic nRF board by PolygonHJ

About the Core PCB

Core is an open source Nordic nRF PCB design by PolygonHJ, published on GitHub under the MIT license. It is a 2-layer board measuring 23 × 33 mm, with 29 components from 23 distinct parts.

Its main chip is the XIAO-NRF54L15, from the Nordic nRF family. Other key parts include the BQ25173DSGR, BQ25570RGRR and 74AXP1T34GWH. By type, the board carries 8 capacitors, 4 ICs, 4 resistors, 2 connectors and 2 inductors.

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

From the project

Xihe is a self-sustaining, ultra-low-power sensing platform designed for long-lifetime deployments with zero maintenance.

The system is designed to be as small and unobtrusive as possible, enabling it to be placed in an environment, monitor passively, and be forgotten—both visually and in terms of maintenance.

Example sensing applications: - Light - Temperature - Humidity - Moisture - Open/Close (e.g. reed switch)

Main components on the Core

XIAO-NRF54L15BQ25173DSGRBQ25570RGRR74AXP1T34GWH

Core bill of materials (BOM)

29 components, 23 distinct parts.

QtyPartRefs
1
XIAO-NRF54L15
Seeed Studio
U1
1
BQ25173DSGR
BQ25173DSG
Texas Instruments
U2
1
BQ25570RGRR
BQ25570
Texas Instruments
U3
1
74AXP1T34GWH
AXP1T34
Nexperia USA Inc.
U4
1
5055501020
MOLEX_SlimStack_505550-1020
Molex
J1
1
801-83-002-20-001101
Conn_01x02_Pin
Preci-Dip
J2
1
EDC474Z5R5H
470m
Cornell Dubilier Knowles
Cb1
1
RC0402FR-074M7L
4.7M
YAGEO
ROK1
1
RC0402FR-075M1L
5.1M
YAGEO
ROK2
1
RC0402FR-073ML
3.0M
YAGEO
ROK3
2
RC0402FR-076M49L
6.49M
YAGEO
ROUT1, ROUT2
1
RC0402FR-074M22L
4.22M
YAGEO
ROV1
1
RC0402FR-078M2L
8.2M
YAGEO
ROV2
1
KXOB25-03X4F-TR
Solar_Cell
ANYSOLAR Ltd
SC1
1
NRS4012T220MDGJ
22u
Taiyo Yuden
L1
1
DFE252012F-100M=P2
10u
Murata Electronics
L2
2
GRM188Z71A475ME15D
4.7u
Murata Electronics
C1, C5
3
GRM155Z71A105KE01J
1u
Murata Electronics
C2, C4, C8
2
GRM155R71C103KA01D
10n
Murata Electronics
C3, C7
1
GRM21BZ71A226ME15L
22u
Murata Electronics
C6
Show 3 more
QtyPartRefs
1
RC0402FR-133KL
3k
YAGEO
R1
1
RC0402FR-07620KL
620k
YAGEO
R2
2
RC0402FR-07120KL
120k
YAGEO
R3, R4

Core design files

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

Core: common questions

What microcontroller does the Core use?

The Core is built around the XIAO-NRF54L15, from the Nordic nRF family.

How big is the Core PCB?

The Core measures 23 × 33 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Core?

29 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the Core design files?

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

Can I use the Core design in my own project?

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

Can I test firmware for the Core without the hardware?

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

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