HardLabs

Zmk uno

zmkfirmware·zmk-uno

Zmk uno PCB layout, top view — open source AVR/Arduino board by zmkfirmware
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About the Zmk uno PCB

Zmk uno is an open source AVR/Arduino PCB design by zmkfirmware, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 68.6 × 53.3 mm, with 74 components from 42 distinct parts.

Its main chip is the Arduino_1pin, from the AVR/Arduino family. Other key parts include the EL817S1 and TS3A27518EPW. By type, the board carries 20 diodes, 18 resistors, 16 connectors, 8 jumpers, 6 switches and 3 transistors.

It belongs with the keyboards, dev boards & breakouts and displays & leds designs in this gallery.

From the project

ZMK Test Shield for Arduino Uno Rev3 Compatible Boards

The ZMK Uno shield is an OSH shield for the Arduino Uno Rev3 interface, making it compatible with any compatible dev kit, such as the Nordic 52840 DK, ST Nucleo 64 kits, etc.

The goal is to create a standard hardware target for testing and development of ZMK, as well as a supported sample hardware for anyone to evaluate ZMK's feature before committing to use it for their designs.

Zmk uno, from the project README
From the project README

Main components on the Zmk uno

EL817S1TS3A27518EPW

Zmk uno bill of materials (BOM)

74 components, 42 distinct parts.

QtyPartRefs
1
EL817S1
U1
1
TS3A27518EPW
U2
2
AO3401A
Q1, Q3
1
AO3416A
Q2
1
SSD1306
J1
1
1 Wire Pull Up
J2
1
I2C Pullups
J5
1
SW1
J6
1
TRRS
J7
1
Left
J8
1
I2C
J9
1
Right
J10
1
Power
P1
1
Analog
P2
1
Digital
P3
1
Digital
P4
4
CONN_01X01
P5, P6, P7, P8
1
Direct Switches
JP1
1
PD1
JP2
1
PD1.1
JP3
Show 22 more
QtyPartRefs
1
SDA Display
JP4
1
SCL Display
JP5
1
MOSI Display
JP6
1
SCK Display
JP7
1
RGB Data Cutoff
JP8
3
SW_Push
SW1, SW2, SW3
1
Rotary_Encoder_Switch
SW4
1
RESET
SW5
1
TOGGLE
SW6
4
1N4148W
D1, D2, D3, D4
3
SK6812MINI-E
D5, D6, D7
4
WS2812B-2020
D8, D9, D10, D11
7
White
D12, D13, D14, D15, D16, D17, D18
2
Orange
D19, D20
1
0.1uF
C1
2
2M
R1, R16
3
10k
R2, R3, R6
1
500
R4
1
150
R5
1
4.7k
R7
9
100
R8, R9, R10, R11, R12, R13, R14, R17 +1
1
10k
R15

Zmk uno design files

The KiCad project lives in the zmkfirmware/zmk-uno repository on GitHub; these links point at the commit this page was built from.

Zmk uno: common questions

What microcontroller does the Zmk uno use?

The Zmk uno is built around the Arduino_1pin, from the AVR/Arduino family.

How big is the Zmk uno PCB?

The Zmk uno measures 68.6 × 53.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Zmk uno?

74 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the Zmk uno design files?

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

Can I use the Zmk uno design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which zmkfirmware chose for the repository.

Can I test firmware for the Zmk uno 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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