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Seeed Studio XIAO nRF52840 v1.1

kzoropoulos·Fall_Detection_System·hardware/KiCad_Components/Seeed_Studio_XIAO_nRF52840/Seeed-Studio-XIAO-nRF52840_V1.1_SCH & PCB_251222_01/Seeed Studio XIAO nRF52840 v1.1.kicad_pcb

Seeed Studio XIAO nRF52840 v1.1 PCB layout, top view — open source Nordic nRF board by kzoropoulos

About the Seeed Studio XIAO nRF52840 v1.1 PCB

Seeed Studio XIAO nRF52840 v1.1 is an open source Nordic nRF PCB design by kzoropoulos, published on GitHub. It is a 4-layer board measuring 21 × 17.8 mm, with 70 components from 40 distinct parts.

Its main chip is the LP0404N3T5G, from the Nordic nRF family. Other key parts include the NRF52840_QF, BQ25101YFPT, LSM6DS3TR-C, XIAO-nRF52840 and SGM2040-3.3YUDH4G/TR. By type, the board carries 27 capacitors, 18 resistors, 6 ICs, 4 test points, 2 crystals and 1 transistor.

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

From the project

A low-power, privacy-friendly elderly fall detection system using 60GHz mmWave radar, PIR sensors, and Zigbee. It features independent room sensors and a resilient central hub for real-time emergency alerts.

Sensor Nodes: Autonomous ceiling-mounted units. They integrate a mmWave radar for point cloud processing, a PIR sensor for hardware wake-up, and a low-power microcontroller. Powered by Lithium Thionyl Chloride (Li-SOCl2) batteries. Central Hub: Data collection and processing unit. It operates as a Zigbee Coordinator, verifies fall events, and routes emergency notifications via Wi-Fi. Supported by an uninterruptible power supply system (Backup battery).

Main components on the Seeed Studio XIAO nRF52840 v1.1

NRF52840_QFBQ25101YFPTLSM6DS3TR-CXIAO-nRF52840SGM2040-3.3YUDH4G/TR

Seeed Studio XIAO nRF52840 v1.1 bill of materials (BOM)

70 components, 40 distinct parts.

QtyPartRefs
1
NRF52840_QF
U1
1
BQ25101YFPT
TI
U2
1
LSM6DS3TR-C
U3
1
XIAO-nRF52840
U4
1
SGM2040-3.3YUDH4G/TR
U6
1
DNP
U7
1
LP0404N3T5G
Q1
1
32.768KHz
X1
1
32MHz
X2
1
ANTENNA-AN3216
ANT1
3
TEST-POINT'4080'
BAT0, NFC1, NFC2
1
GND
GND0
1
BUTTON-4P
K1
1
MSM261D3526H1CPM
MIC1
1
RGB
RGB6
4
TEST-POINT'4545'
TP1, TP2, TP3, TP5
1
USB2.0-TYPE-C
USB1
1
RED
CHG0
1
SDM20U40-7
D1
1
10uH
L3
Show 20 more
QtyPartRefs
5
100nF
C1, C5, C8, C24, C34
2
10pF
C2, C7
11
2.2uF
C3, C4, C6, C9, C22, C25, C29, C30 +3
1
1nF
C10
1
820pF
C31
2
15pF
C32, C33
1
100pF
C35
1
0.8pF
C36
1
0.5pF
C37
1
4.7nH
C38
1
DNP
C40
2
5.1k
R1, R2
3
2.2k
R3, R5, R7
5
10k
R4, R13, R14, R15, R20
1
DNP
R8
1
100k
R9
2
33R
R10, R11
2
2.7k
R12, R18
1
1M_1%
R16
1
510k_1%
R17

Seeed Studio XIAO nRF52840 v1.1 design files

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

Seeed Studio XIAO nRF52840 v1.1: common questions

What microcontroller does the Seeed Studio XIAO nRF52840 v1.1 use?

The Seeed Studio XIAO nRF52840 v1.1 is built around the LP0404N3T5G, from the Nordic nRF family.

How big is the Seeed Studio XIAO nRF52840 v1.1 PCB?

The Seeed Studio XIAO nRF52840 v1.1 measures 21 × 17.8 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Seeed Studio XIAO nRF52840 v1.1?

70 components, from 40 distinct parts. The full bill of materials is listed on this page.

Where can I download the Seeed Studio XIAO nRF52840 v1.1 design files?

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

Can I use the Seeed Studio XIAO nRF52840 v1.1 design in my own project?

The repository has no license, so all rights stay with kzoropoulos. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Seeed Studio XIAO nRF52840 v1.1 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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