HardLabs

Ourglass

photomattmills·ourglass·watch-v4/watch-v4.kicad_pcb

Ourglass PCB layout, top view — open source Nordic nRF board by photomattmills

About the Ourglass PCB

Ourglass is an open source Nordic nRF PCB design by photomattmills, published on GitHub under the MIT license. It is a 4-layer board measuring 35.1 × 14 mm, with 43 components from 34 distinct parts.

Its main chip is the NRF51822, from the Nordic nRF family. Other key parts include the IC_MCP73831, MIC5211, DS3231, LSM9DS0 and BALUN. By type, the board carries 17 capacitors, 10 resistors, 6 ICs, 3 connectors, 2 diodes and 1 transistor.

It belongs with the wearables designs in this gallery.

From the project

The central repo for all the ourglass files. Changes frequently.

This is the code and design files for Ourglass, an open source watch. Feel free to use, modify, and extend in any way you see fit, all are released under the MIT license. http://ourglass.watch for updates.

Comments, questions, and pull requests welcome. This project follows a code of conduct (fully at codeofconduct.md) and by contributing, you agree to abide by that code.

Ourglass, from the project README
From the project README

Main components on the Ourglass

IC_MCP73831MIC5211DS3231LSM9DS0NRF51822BALUN

Ourglass bill of materials (BOM)

43 components, 34 distinct parts.

QtyPartRefs
1
IC_MCP73831
U1
1
MIC5211
U2
1
DS3231
U3
1
LSM9DS0
U4
1
NRF51822
U5
1
BALUN
U6
1
MOSFET_P
Q1
1
16mhz
X1
1
CONN_10
J1
1
Expansion Header
P1
1
Test Points
P2
1
-
ANT1
1
BATTERY
LIPOLY1
1
USB_MICRO_B
XL1
1
DIODESCH
D1
1
LED
D2
3
1uf
C1, C16, C17
3
4.7uf
C2, C3, C6
1
100n
C4
1
.22uf
C5
Show 14 more
QtyPartRefs
1
10uf
C7
2
0.1uf
C8, C13
1
47n
C9
2
12pf
C10, C15
1
2n2
C11
1
1u
C12
1
1nf
C14
1
47Ω
R1
1
10kΩ
R2
1
R100kΩ
R3
1
10k
R4
2
4.7k
R5, R6
2
10M
R7, R8
2
0
R9, R10

Ourglass design files

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

Ourglass: common questions

What microcontroller does the Ourglass use?

The Ourglass is built around the NRF51822, from the Nordic nRF family.

How big is the Ourglass PCB?

The Ourglass measures 35.1 × 14 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Ourglass?

43 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the Ourglass design files?

From the photomattmills/ourglass repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Ourglass design in my own project?

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

Can I test firmware for the Ourglass without the hardware?

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

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