HardLabs

Smart watch

Paarth-Shirsat·Smart-watch·PCB_Files/watch.kicad_pcb

Smart watch PCB layout, top view — open source RP2040/RP2350 board by Paarth-Shirsat

About the Smart watch PCB

Smart watch is an open source RP2040/RP2350 PCB design by Paarth-Shirsat, published on GitHub. It is a 4-layer board measuring 40 × 40 mm, with 109 components from 54 distinct parts.

Its main chip is the ESP32-PICO-D4, from the RP2040/RP2350 family. Other key parts include the APS6404L-3SQRx-ZR, CP2102N-Axx-xQFN28, TPS7A0533PDBV, MCP73831-2-OT and AP9101CK6. By type, the board carries 37 capacitors, 35 resistors, 13 ICs, 7 diodes, 6 transistors and 3 connectors.

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

From the project

An industry-grade, open-source Smart-watch featuring high-end sensors and a sleek hardware design with it's firmware written in Zephyr RTOS.

A comprehensive open-source smart-watch project featuring high-end sensors, GPS integration, and a sleek hardware design. This project is built around the ESP32-PICO-D4 System-in-Package, providing a compact yet powerful core for wearable applications.

- Core Processor: ESP32-PICO-D4 (Dual-core, Wi-Fi & Bluetooth, integrated Flash). - Navigation: u-blox MAX-M10S GNSS module for high-precision positioning. - Health Monitoring: MAX30102/30105 sensor for heart rate and pulse oximetry. - Motion Tracking: LSM6DSO/LSM6DS3 6-axis IMU (Accelerometer + Gyroscope). - Environment: BMP388 barometric…

Smart watch, from the project README
From the project README

Main components on the Smart watch

APS6404L-3SQRx-ZRESP32-PICO-D4CP2102N-Axx-xQFN28TPS7A0533PDBVMCP73831-2-OTAP9101CK6MAX30105EFD_TW25Q128JVSBMP388LSM6DS3MAX-M10SMCP1700x-120xxMBDRV2605LDGS

Smart watch bill of materials (BOM)

109 components, 54 distinct parts.

QtyPartRefs
1
APS6404L-3SQRx-ZR
U1
1
ESP32-PICO-D4
U2
1
CP2102N-Axx-xQFN28
U3
1
TPS7A0533PDBV
U4
1
MCP73831-2-OT
U5
1
AP9101CK6
U6
1
MAX30105EFD_T
U7
1
W25Q128JVS
U8
1
BMP388
U9
1
LSM6DS3
U10
1
MAX-M10S
U11
1
MCP1700x-120xxMB
U12
1
DRV2605LDGS
U13
3
BC847
Q1, Q2, Q8
1
FS8205A
Q3
2
BSS138
Q4, Q5
1
SG-3030CM
Y1
1
Conn_01x14_MountingPin
J2
1
Conn_01x02_Pin
J3
1
USB_C_Plug_USB2.0
P1
Show 34 more
QtyPartRefs
2
Antenna_Shield
AE1, AE2
2
SW_Push
SW1, SW2
1
NC
D1
3
LED
D3, D4, D5
1
PESD0402-0402T
D6
1
SP0503BAHT
D13
1
D_Zener
D14
1
FerriteBead
FB1
1
2 nH
L1
1
1.8 nH
L2
15
0.1 uF
C1, C4, C5, C8, C10, C11, C13, C14 +7
6
1 uF
C2, C9, C17, C24, C25, C32
1
100 pF
C3
3
4.7 uF
C6, C7, C18
1
0 F
C12
2
100nF
C15, C16
3
10 uF
C19, C20, C21
1
47 pF
C26
2
1uF
C30, C31
1
1.2 pF
C35
1
1.5 pF
C36
1
0.1uF
C38
3
0R
R1, R17, R30
14
10k
R2, R4, R5, R11, R12, R22, R23, R29 +6
2
5.1k
R3, R33
3
330
R7, R14, R15
1
2.7k
R13
1
2k
R16
4
4.7k
R18, R19, R20, R21
3
33
R26, R27, R28
1
22.1k
R34
1
47.5k
R35
1
22
R36
1
1k
R37

Smart watch design files

The KiCad project lives in the Paarth-Shirsat/Smart-watch repository on GitHub; these links point at the commit this page was built from.

Smart watch: common questions

What microcontroller does the Smart watch use?

The Smart watch is built around the ESP32-PICO-D4, from the RP2040/RP2350 family.

How big is the Smart watch PCB?

The Smart watch measures 40 × 40 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Smart watch?

109 components, from 54 distinct parts. The full bill of materials is listed on this page.

Where can I download the Smart watch design files?

From the Paarth-Shirsat/Smart-watch repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Smart watch design in my own project?

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

Can I test firmware for the Smart watch without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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