2 layers30 × 30 mm Blewatch, the printed circuit board in 3D

Blewatch

A BLE Watch using nrf51822

Size: 30 × 30 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 27
Nets: 34
Pads: 136
Tracks, vias: 274, 42
Pours: 4
Routed: Yes
KiCad: KiCad 4
Created: 9 Dec 2017
Updated: 9 Dec 2017

Overview

Blewatch is an open-source printed circuit board by jim-kirisame, from the jim-kirisame/LotWatch repository on GitHub. It is a 2-layer board of 30 × 30 mm with 27 parts on 34 nets, routed with 274 tracks and 42 vias.

It is built around the MMA8452QT, RT9193-3.3 and TP4057, with the SI2306 among its other parts. Its parts include 11 capacitors, 5 ICs, 5 connectors, 4 resistors and 2 transistors. It belongs with the nRF52 and nRF5x boards of this library.

Main components

README

README.md

LotWatch

LotWatch是一个自制的蓝牙手表项目。它使用了nRF51822作为核心，mma8452为加速度计。

使用nRF SDK V10.0开发，并在Keil MDK v5下编译通过。

文件结构

app-js：手机端应用程序，使用Cordova编写
Application：手表的主程序部分
Bootloader：手表的Bootloader，用于OTA
Hardware：硬件设计
Release：编译好的各个程序，可以直接使用。

其余事项见各文件夹下的说明。

Category and platform

nRF52 and nRF5x

Project files

Show this board on your page

https://pcbkit.io/boards/jim-kirisame/LotWatch

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

Source

Repository: jim-kirisame/LotWatch
Board file: Hardware/blewatch.kicad_pcb
Commit: c64a5ef
Licence: Not stated

Parts

Qty	Value	Footprint	References
4	1uF	Capacitors_SMD:C_0805	C1, C2, C5, C7
3	CONN_01X02	custom:SIP-2-1.27	P2, P3, P7
2	0.1uF	Capacitors_SMD:C_0805	C8, C9
2	22nF	Capacitors_SMD:C_0805	C6, C12
2	4.7uF	Capacitors_SMD:C_0805	C3, C10
2	SI2306	TO_SOT_Packages_SMD:SOT-23	Q1, Q2
1	10M	Resistors_SMD:R_0805	R6
1	2.2M	Resistors_SMD:R_0805	R7
1	2.2uF	Capacitors_SMD:C_0805	C4
1	25LC_EEPROM	SMD_Packages:SOIC-8-N	U3
1	5K	Resistors_SMD:R_0805	R9
1	910K	Resistors_SMD:R_0805	R1
1	CONN_01X04	custom:SIP-4-1.27	P1
1	CONN_01X15	custom:OLED-15PIN	P5
1	MMA8452	SMD_Packages:QFN-16-1EP_3x3mm_Pitch0.5mm_SPEC	U2
1	RT9193	TO_SOT_Packages_SMD:SOT-23-5	U5
1	TP4057	TO_SOT_Packages_SMD:SOT-23-6	U4
1	nrf51822-02	lib:nRF51822-02	U1

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Questions

How big is the Blewatch PCB?

It measures 30 × 30 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Blewatch use?

27 parts, built around the MMA8452QT, RT9193-3.3, TP4057 and SI2306. 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 Blewatch KiCad files?

From the jim-kirisame/LotWatch repository on GitHub, at the commit this page was made from: the board is Hardware/blewatch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Blewatch design in my own project?

Its repository states no licence, so its author keeps all rights: ask jim-kirisame before reusing the design.