HardLabs

Twelvekey

str-dst·twelvekey·pcb/twelvekey.kicad_pcb

Twelvekey PCB layout, top view — open source AVR/Arduino board by str-dst
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About the Twelvekey PCB

Twelvekey is an open source AVR/Arduino PCB design by str-dst, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 75.2 × 62.6 mm, with 52 components from 19 distinct parts.

Its main chip is the ATMEGA328P-A, from the AVR/Arduino family. Other key parts include the SRV05-4. By type, the board carries 20 resistors, 8 diodes, 5 capacitors, 2 ICs, 1 transistor and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

simple mechanical macropad case

- In-switch LEDs - Powered by an Atmega328p - Basic ESD and overvoltage protection - Centered USB type-C port for a detachable cable - Fully programmable using QMK and Vial

Twelvekey, from the project README
From the project README

Main components on the Twelvekey

ATMEGA328P-ASRV05-4

Twelvekey bill of materials (BOM)

52 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA328P-A
ATmega328P-A
U1
1
SRV05-4
U2
1
AO3401A
Q1
1
CRYSTAL_GND24_SMALL
Crystal_GND24_Small
X1
1
CONN_01X06
Conn_01x06
J1
1
C151133
Polyfuse_Small
F1
12
MX-LED
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +4
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
USB1
6
C408391
D_Small
D1, D2, D3, D4, D5, D6
2
C173412
D_Zener_Small
D7, D8
1
10UF
10uF
C1
2
0.1UF
0.1uF
C2, C3
2
22PF
22pF
C7, C8
12
1k
R1, R3, R4, R10, R11, R12, R13, R14 +4
2
10K
10k
R2, R20
2
5.1K
5.1k
R5, R6
2
68R
R7, R8
1
1.5K
R9
1
100R
R19

Twelvekey design files

The KiCad project lives in the str-dst/twelvekey repository on GitHub; these links point at the commit this page was built from.

Twelvekey: common questions

What microcontroller does the Twelvekey use?

The Twelvekey is built around the ATMEGA328P-A, from the AVR/Arduino family.

How big is the Twelvekey PCB?

The Twelvekey measures 75.2 × 62.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Twelvekey?

52 components, from 19 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 Twelvekey design files?

From the str-dst/twelvekey 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 Twelvekey design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Twelvekey 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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