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PulseWatch

abendezu10·PulseWatch·KiCad/Health_Watch/Health_Watch.kicad_pcb

PulseWatch PCB layout, top view — open source STM32 board by abendezu10
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About the PulseWatch PCB

PulseWatch is an open source STM32 PCB design by abendezu10, published on GitHub. It is a 4-layer board measuring 40 × 30 mm, with 33 components from 19 distinct parts.

Its main chip is the STM32L476RGT6, from the STM32 family. Other key parts include the MCP73831T-2ACI/OT and MIC5365-3.3YD5-TR. By type, the board carries 15 capacitors, 8 resistors, 3 ICs, 3 connectors, 2 crystals and 2 diodes.

It belongs with the wearables and sensors designs in this gallery.

From the project

Developed a fully functional smartwatch using an STM32 microcontroller, featuring real-time heart rate monitoring. Utilized SPI and I2C communication protocols to interface with biometric sensors and other peripherals, ensuring efficient data transmission and system performance.

PulseWatch, from the project README
From the project README

Main components on the PulseWatch

MCP73831T-2ACI/OTMIC5365-3.3YD5-TRSTM32L476RGT6

PulseWatch bill of materials (BOM)

33 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP73831T-2ACI/OT
MCP73831-2-OT
Microchip Technology
U1
1
MIC5365-3.3YD5-TR
MIC5365-3.3YD5
Microchip Technology
U2
1
STM32L476RGT6
STM32L476RGTx
STMicroelectronics
U3
1
ECS-2016MV-080-DN-TR
8MHz
ECS
X1
1
FC-135R 32.7680KA-A3
32KHz
Epson Timing
X2
1
S2B-PH-K-S
JST-PH-Conn
JST Sales America Inc.
J1
1
USB4125-GF-A
USB_C_Receptacle_PowerOnly_6P
GCT
J2
1
CONN_01X11
Conn_01x11
J4
1
ZHCS350TA
D_Schottky
Diodes Incorporated
D1
1
ESD9B5.0ST5G
TVS Diode
onsemi
D2
4
LMK107BJ475KA-T
4u7
TAIYO YUDEN
C1, C8, C9, C10
6
0402X7R104KT7AT
100n
KYOCERA AVX
C2, C3, C4, C5, C6, C11
1
TMK212BBJ106KG8T
10u
TAIYO YUDEN
C7
2
C0402C200F5GACTU
20p
KEMET
C12, C13
2
MBASU105SCH100JFNA01
10p
TAIYO YUDEN
C14, C15
3
MCS04020C5101FE000
5k1
Vishay / Beyschlag
R1, R2, R3
2
CRCW060310K0FKEA
10k
Vishay / Dale
R4, R7
2
CRCW04024K70FKEDC
4k7
Vishay / Dale
R5, R6
1
ERJ-PA3F3900V
390R
Panasonic
R9

PulseWatch design files

The KiCad project lives in the abendezu10/PulseWatch repository on GitHub; these links point at the commit this page was built from.

PulseWatch: common questions

What microcontroller does the PulseWatch use?

The PulseWatch is built around the STM32L476RGT6, from the STM32 family.

How big is the PulseWatch PCB?

The PulseWatch measures 40 × 30 mm, has 4 copper layers and is 1.586 mm thick.

How many components are on the PulseWatch?

33 components, from 19 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 PulseWatch design files?

From the abendezu10/PulseWatch 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 PulseWatch design in my own project?

The repository has no license, so all rights stay with abendezu10. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the PulseWatch without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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