HardLabs

Ornament2025

Chris-Johnston·ornament2025·pcb/ornament2025/ornament2025.kicad_pcb

Ornament2025 PCB layout, top view — open source AVR/Arduino board by Chris-Johnston

About the Ornament2025 PCB

Ornament2025 is an open source AVR/Arduino PCB design by Chris-Johnston, published on GitHub. It is a 2-layer board measuring 90.1 × 90.1 mm, with 18 components from 8 distinct parts.

Its main chip is the ATtiny404-SS, from the AVR/Arduino family. By type, the board carries 6 diodes, 6 resistors, 2 switches, 1 IC, 1 connector and 1 capacitor.

From the project

Attiny404 xmas ornament for 2025.

Another ATTiny404-based LED Xmas tree ornament. This is a continuation of a series of boards I've worked on in previous years: [2024] [2023] [2022] [2021]

This year's iteration is still very similar to [2023]'s circuit, I am once again using red/green bicolor LEDs and unlike [2024] I actually hooked these up to the correct pins in order to have PWM.

I started working on this design in early November, but put off ordering the boards until early December. I paid extra for faster shipping and manufacturing time, but lost time when I was initially shipped an empty package, from the bag being…

Ornament2025, from the project README
From the project README

Main components on the Ornament2025

ATtiny404-SS

Ornament2025 bill of materials (BOM)

18 components, 8 distinct parts.

QtyPartRefs
1
ATtiny404-SS
U1
1
Conn_01x03
J1
1
BH-25C-1
B1
1
SW_Push
SW1
1
SW_DPDT_x2
SW2
6
LED_Dual_2pin
D1, D2, D3, D4, D5, D6
1
C
C1
6
R
R1, R2, R3, R4, R5, R6

Ornament2025 design files

The KiCad project lives in the Chris-Johnston/ornament2025 repository on GitHub; these links point at the commit this page was built from.

Ornament2025: common questions

What microcontroller does the Ornament2025 use?

The Ornament2025 is built around the ATtiny404-SS, from the AVR/Arduino family.

How big is the Ornament2025 PCB?

The Ornament2025 measures 90.1 × 90.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ornament2025?

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

Where can I download the Ornament2025 design files?

From the Chris-Johnston/ornament2025 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Ornament2025 design in my own project?

The repository has no license, so all rights stay with Chris-Johnston. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Ornament2025 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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