4 layers45 × 41 mm Osw, the printed circuit board in 3D

Osw

Hardware design files for the GPS version of the open-smartwatch

Size: 45 × 41 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 70
Nets: 78
Pads: 293
Tracks, vias: 707, 193
Pours: 8
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 2 Sep 2020
Updated: 30 Jun 2025

Overview

Osw is an open-source printed circuit board by Open-Smartwatch, from the Open-Smartwatch/open-smartwatch-gps repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 45 × 41 mm with 70 parts on 78 nets, routed with 707 tracks and 193 vias.

It is built around the CH340E, BMA400 and DS3231MZ/V+, with the MCP73831T-2ACI/OT-HXY and TPS2115APW among its other parts. Its parts include 25 resistors, 22 capacitors, 12 ICs, 4 switches and 1 diode.

Main components

README

README.md

Open-Smartwatch KiCAD files

Repo for kicad schematic, board and gerber files. This project is in development and is not ready for release.

Update 2025-06: There never was a release since the selected GPS module does not work on a wearable-sized PCB, and while worn at the same time.

Tools

To view/modify the files from this repository, install KiCAD from: https://kicad.org

Also, add the following Symbol/Footprint library to KiCAD: https://github.com/Open-Smartwatch/Kicad-Libraries

Schematic

Plots

BOM

See: https://htmlpreview.github.io/?https://github.com/Open-Smartwatch/kicad-project/blob/master/docs/bom/osw-ibom_v.html

Instagram

https://www.instagram.com/pauls_3d_things/

Topics

kicad gerber-files

Project files

Show this board on your page

https://pcbkit.io/boards/Open-Smartwatch/open-smartwatch-gps

The board's own page, for a message or a post.

Source

Repository: Open-Smartwatch/open-smartwatch-gps
Board file: osw.kicad_pcb
Commit: 744b1f4
Licence: GPL-3.0

Parts

Qty	Value	Footprint	References
14	0.1u	Capacitor_SMD:C_0603_1608Metric	C3, C4, C7, C8, C9, C10, C11, C12, C13, C14, C15, C18, C19, C22
7	10k	Resistor_SMD:R_0603_1608Metric	R8, R9, R10, R11, R17, R20, R21
6	1k	Resistor_SMD:R_0603_1608Metric	R2, R3, R6, R7, R24, R25
4	SW_Push	open-Smartwatch:button_side_smd	SW1, SW2, SW4, SW5
2	100u	Capacitor_SMD:C_1206_3216Metric	C5, C6
2	200k	Resistor_SMD:R_0603_1608Metric	R16, R19
2	4.7u	Capacitor_SMD:C_0603_1608Metric	C16, C17
2	4.7uF	Capacitor_SMD:C_0603_1608Metric	C1, C2
2	470R	Resistor_SMD:R_0603_1608Metric	R4, R13
2	XC6209	Package_TO_SOT_SMD:SOT-23-5	U10, U13
1	0R	Resistor_SMD:R_0402_1005Metric	R5
1	100p	Capacitor_SMD:C_0603_1608Metric	C20
1	10p	Capacitor_SMD:C_0603_1608Metric	C21
1	1M	Resistor_SMD:R_0603_1608Metric	R22
1	2.2K	Resistor_SMD:R_0603_1608Metric	R18
1	22	Resistor_SMD:R_0603_1608Metric	R1
1	2N7002	Package_TO_SOT_SMD:SOT-23	Q1
1	5.6k	Resistor_SMD:R_0603_1608Metric	R12
1	510R	Resistor_SMD:R_0603_1608Metric	R14
1	56k	Resistor_SMD:R_0603_1608Metric	R23
1	5k	Resistor_SMD:R_0603_1608Metric	R15
1	BMA400	open-Smartwatch:LGA-12_2x2mm_P0.5mm	U2
1	CH340E	open-Smartwatch:MSOP-10_3x3mm_P0.5mm	U6
1	Conn_01x02	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J1
1	DS3231MZ	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U1
1	GC9A01_IPS_display	open-Smartwatch:GC9A01_IPS_display	U4
1	LED_Green	LED_SMD:LED_0805_2012Metric	D1
1	LOGO	footprints:p3dt_tiny	G***
1	LOGO	footprints:aisler_15x12mm	G***
1	MCP73831T-2ACI_OT	open-Smartwatch:SOT-23-5	U11
1	PSRAM64H	Package_SO:SOP-8_3.9x4.9mm_P1.27mm	U3
1	Quectel_L96	open-Smartwatch:Quectel_L96	U8
1	SD_ebay-uSD-push_push_SMD	open-Smartwatch:Conn_uSDcard	XS1
1	TPS2115A	open-Smartwatch:TSSOP-8_4.4x3mm_P0.65mm	U9
1	USB-OTG	open-Smartwatch:USBmicro-B	U5
1	ttgo-32-micro	open-Smartwatch:ttgo-32-micro	U7

The 69 most common of 70 parts.

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Questions

How big is the Osw PCB?

It measures 45 × 41 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Osw use?

70 parts, built around the CH340E, BMA400, DS3231MZ/V+ and MCP73831T-2ACI/OT-HXY. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Osw KiCad files?

From the Open-Smartwatch/open-smartwatch-gps repository on GitHub, at the commit this page was made from: the board is osw.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Osw design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).