HardLabs

LED-Keychain

yansha2903-bot·LED-Keychain·KiCad/LED-Keychain.kicad_pcb

LED-Keychain PCB layout, top view — open source AVR/Arduino board by yansha2903-bot

About the LED-Keychain PCB

LED-Keychain is an open source AVR/Arduino PCB design by yansha2903-bot, published on GitHub. It is a 2-layer board measuring 138.9 × 99.4 mm, with 15 components from 8 distinct parts.

Its main chip is the ATTINY412-SS, from the AVR/Arduino family. By type, the board carries 8 diodes, 2 switches, 2 capacitors, 1 IC, 1 battery holder and 1 resistor.

From the project

A small programmable LED keychain designed in KiCad and powered by an ATtiny412.

A small programmable LED keychain designed in KiCad and powered by an ATtiny412.

This is my first PCB project, so the main goal wasn't to create something revolutionary. I wanted to learn the complete hardware design process: creating a schematic, assigning footprints, routing a PCB, generating Gerber files, and writing firmware for a microcontroller.

- ⭐ Star-shaped PCB - 🌈 8 addressable SK6812MINI-E RGB LEDs - 🔋 Powered by a CR2032 coin cell battery - 🔘 Push button for switching lighting modes - ⏻ Power switch - 💡 ATtiny412 microcontroller

Main components on the LED-Keychain

ATTINY412-SS

LED-Keychain bill of materials (BOM)

15 components, 8 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY412-SS
ATtiny412-SS
U1
1
Battery_Cell
BT1
1
SW_SPST
SW1
1
SW_Push
SW2
8
SK6812MINI-E
D1, D2, D3, D4, D5, D6, D7, D8
1
100 nF
C1
1
100 µF
C2
1
330 Ω
R1

LED-Keychain design files

The KiCad project lives in the yansha2903-bot/LED-Keychain repository on GitHub; these links point at the commit this page was built from.

LED-Keychain: common questions

What microcontroller does the LED-Keychain use?

The LED-Keychain is built around the ATTINY412-SS, from the AVR/Arduino family.

How big is the LED-Keychain PCB?

The LED-Keychain measures 138.9 × 99.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the LED-Keychain?

15 components, from 8 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 LED-Keychain design files?

From the yansha2903-bot/LED-Keychain 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 LED-Keychain design in my own project?

The repository has no license, so all rights stay with yansha2903-bot. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the LED-Keychain 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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