HardLabs

Snowflake ornament

Chris-Johnston·snowflake-ornament·snowflake2021/snowflake2021.kicad_pcb

Snowflake ornament PCB layout, top view — open source AVR/Arduino board by Chris-Johnston

About the Snowflake ornament PCB

Snowflake ornament is an open source AVR/Arduino PCB design by Chris-Johnston, published on GitHub under the MIT license. It is a 2-layer board measuring 79 × 86.5 mm, with 16 components from 8 distinct parts.

Its main chip is the ATtiny85V-10SU, from the AVR/Arduino family. By type, the board carries 6 diodes, 5 resistors, 1 IC, 1 connector, 1 battery holder and 1 switch.

From the project

An ATTiny85 Xmas Ornament with LEDs ❄

A snowflake shaped Xmas ornament with blinking LEDs.

This uses an ATTiny85 to drive 6 blue LEDs which are multiplexed. There's a button on the front which is used to toggle display modes and sleep.

When sleeping, the ornament uses about 200 microamps of current, little enough to run off of a coin cell battery for about 1000 hours (in reality, probably less. I don't know, I didn't measure it)! While running, it uses about 2 milliamps, which could last for about 120 hours.

Snowflake ornament, from the project README
From the project README

Main components on the Snowflake ornament

ATtiny85V-10SU

Snowflake ornament bill of materials (BOM)

16 components, 8 distinct parts.

QtyPartRefs
1
ATtiny85V-10SU
U1
1
AVR-ISP-6
J1
1
Battery
BT1
1
SW_Push
SW1
6
LED
D1, D2, D3, D4, D5, D6
1
1 uf
C1
4
R
R1, R2, R3, R4
1
10k
R5

Snowflake ornament design files

The KiCad project lives in the Chris-Johnston/snowflake-ornament repository on GitHub; these links point at the commit this page was built from.

Snowflake ornament: common questions

What microcontroller does the Snowflake ornament use?

The Snowflake ornament is built around the ATtiny85V-10SU, from the AVR/Arduino family.

How big is the Snowflake ornament PCB?

The Snowflake ornament measures 79 × 86.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Snowflake ornament?

16 components, from 8 distinct parts. The full bill of materials is listed on this page.

Where can I download the Snowflake ornament design files?

From the Chris-Johnston/snowflake-ornament repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Snowflake ornament design in my own project?

Yes, under the terms of its MIT license, which Chris-Johnston chose for the repository.

Can I test firmware for the Snowflake ornament without the hardware?

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

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