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Arasaka-Ember-Mk.II

dhruvin-sarkar·Arasaka-Ember-Mk.II

Arasaka-Ember-Mk.II PCB layout, top view — open source STM32 board by dhruvin-sarkar

About the Arasaka-Ember-Mk.II PCB

Arasaka-Ember-Mk.II is an open source STM32 PCB design by dhruvin-sarkar, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 24.3 × 181.8 mm, with 31 components from 11 distinct parts.

Its main chip is the STM32U083KCUx, from the STM32 family. Other key parts include the HCMS2901. By type, the board carries 17 ICs, 6 capacitors, 4 switches, 2 connectors and 2 resistors.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

A Nixie tube wristwatch that was made from scratch with its own hardware and firmware. It was Inspired by Cyberpunk 2077 with its exposed flex PCB

A cyberpunk-inspired wristwatch built on a custom flexible PCB, wrapping high-density alphanumeric LED displays around the wrist in an infinite loop. Displays animated effects and real-time clock output.

Ember Mk.II is a handmade wristwatch built around a custom flexible PCB that wraps 14 Broadcom HCMS-2901 alphanumeric LED displays around the wrist.

Press the center button to wake the display and trigger the boot animation. Use the up and down buttons to cycle through menus: time display, mini time, brightness, current, timezone offset, and wave mode. The watch charges and programs over…

Main components on the Arasaka-Ember-Mk.II

STM32U083KCUxHCMS2901

Arasaka-Ember-Mk.II bill of materials (BOM)

31 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32U083KCUx
U1
2
~
U2, U3
14
HCMS2901
U5, U6, U7, U8, U9, U10, U11, U12 +6
1
Conn_01x04_Socket
J1
1
Conn_01x04_Pin
J2
1
BOOT0
SW1
1
UP
SW2
1
CENTER
SW3
1
DOWN
SW4
6
C
C1, C2, C3, C4, C5, C6
2
R
R1, R2

Arasaka-Ember-Mk.II design files

The KiCad project lives in the dhruvin-sarkar/Arasaka-Ember-Mk.II repository on GitHub; these links point at the commit this page was built from.

Arasaka-Ember-Mk.II: common questions

What microcontroller does the Arasaka-Ember-Mk.II use?

The Arasaka-Ember-Mk.II is built around the STM32U083KCUx, from the STM32 family.

How big is the Arasaka-Ember-Mk.II PCB?

The Arasaka-Ember-Mk.II measures 24.3 × 181.8 mm, has 2 copper layers and is 0.18 mm thick.

How many components are on the Arasaka-Ember-Mk.II?

31 components, from 11 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Arasaka-Ember-Mk.II design files?

From the dhruvin-sarkar/Arasaka-Ember-Mk.II repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Arasaka-Ember-Mk.II design in my own project?

Yes, under the terms of its Apache-2.0 license, which dhruvin-sarkar chose for the repository.

Can I test firmware for the Arasaka-Ember-Mk.II without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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