HardLabs

Watch2

atctwo·watch-II·design_files/watch2_board/watch2.kicad_pcb

Watch2 PCB layout, top view — open source ESP32 board by atctwo

About the Watch2 PCB

Watch2 is an open source ESP32 PCB design by atctwo, published on GitHub under the MIT license. It is a board measuring 48.6 × 35.6 mm, with 66 components from 41 distinct parts.

Its main chip is the ESP32-WROVER, from the ESP32 family. Other key parts include the FT230XS, MCP73831-2-OT, LC709203FQH-01TWG, MAX16150AUT+T and MAX604. By type, the board carries 28 resistors, 10 ICs, 9 capacitors, 7 connectors, 4 diodes and 2 transistors.

It belongs with the wearables designs in this gallery.

From the project

Firmware for my custom smart-ish-watch, mark II

This folder has a few different subfolders, explained below. The schematic and PCB for the watch were designed using KiCad. All of the development on the current form of the schematic + PCB takes place in the watch2board` folder. The case for the watch was designed in OpenSCAD, and was designed to be 3D printed. The rest of the folders are kept for archival purposes.

Main components on the Watch2

FT230XSMCP73831-2-OTLC709203FQH-01TWGMAX16150AUT+TMAX604MCP23008-xSSESP32-WROVERMAX98357AETE+TTSOP38238MCP9808_MSOP

Watch2 bill of materials (BOM)

66 components, 41 distinct parts.

QtyPartRefs
1
FT230XS
U1
1
MCP73831-2-OT
U2
1
LC709203FQH-01TWG
U3
1
MAX16150AUT+T
U4
1
MAX604
U5
1
MCP23008-xSS
U6
1
ESP32-WROVER
U7
1
MAX98357AETE+T
U8
1
TSOP38238
U9
1
MCP9808_MSOP
U10
2
Q_NPN_BCE
Q2, Q3
1
USB_C_Receptacle_USB2.0
J1
1
STEMMA QT
J2
1
UART Connector
J3
2
Conn_01x03_Male
J4, J5
1
TFT Connector
J6
1
Torch Connector (main board)
J7
1
Battery_Cell
BT1
1
Panasonic_EVQPUJ_EVQPUA
IO0
1
Speaker
LS1
Show 21 more
QtyPartRefs
1
SPH0645LM4H-B
MK1
1
SW_Push
SW2
1
Power Button
SW3
1
LED
D1
1
TX
D2
1
RX
D3
1
LED_IR
D5
7
0.1uF
C1, C3, C5, C6, C7, C8, C9
2
10uF
C2, C4
6
1k
R1, R6, R10, R14, R17, R18
2
4k7
R2, R3
2
27R
R4, R5
2
5k1
R7, R8
1
2k
R9
5
R
R11, R12, R13, R19, R20
2
10k
R15, R27
1
680k
R24
2
100k
R25, R26
2
100R
R28, R31
1
68R
R29
2
330R
R30, R32

Watch2 design files

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

Watch2: common questions

What microcontroller does the Watch2 use?

The Watch2 is built around the ESP32-WROVER, from the ESP32 family.

How big is the Watch2 PCB?

The Watch2 measures 48.6 × 35.6 mm and is 1.6 mm thick.

How many components are on the Watch2?

66 components, from 41 distinct parts. The full bill of materials is listed on this page.

Where can I download the Watch2 design files?

From the atctwo/watch-II repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Watch2 design in my own project?

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

Can I test firmware for the Watch2 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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