HardLabs

Litl keyboard

mohoyt·litl·PCB/litl.kicad_pcb

Litl keyboard PCB layout, top view — open source AVR/Arduino board by mohoyt
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About the Litl keyboard PCB

Litl keyboard is an open source AVR/Arduino PCB design by mohoyt, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 248.3 × 99.8 mm, with 103 components from 11 distinct parts.

Its main chip is the ProMicro, from the AVR/Arduino family. By type, the board carries 54 switches, 47 diodes, 1 IC and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

Litl is an easy to build 40% keyboard using only through hole components.

Litl is licensed under the Creative Commons Attribution-NonCommercial 4.0 International license. This design as it stands in this repository may be freely reproduced, modified, and manufactured for PERSONAL USE ONLY and may not be reproduced in physical form for public sale.

Litl kits are available for sale at sthlmkb.com

Have been fixed in v3 (and gerbers now updated) but were present in later iterations of v2 - [x] Pin for switch alternative on left rotary encoder shorted with ground - [x] Holes for optional acrylic cover have been readded

Litl keyboard, from the project README
From the project README

Main components on the Litl keyboard

ProMicro

Litl keyboard bill of materials (BOM)

103 components, 11 distinct parts.

QtyPartRefs
1
ProMicro
U1
1
Conn_01x04
J1
2
KEYSW
SW1, SW12
37
KEYSW
SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 +29
6
KEYSW
SW13, SW28, SW42, SW43, SW45, SW50
2
KEYSW
SW14, SW39
3
KEYSW
SW26, SW27, SW46
1
KEYSW
SW47
1
KEYSW
SW48
2
RotaryEncoder_Switch
SW51, SW53
47
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +39

Litl keyboard design files

The KiCad project lives in the mohoyt/litl repository on GitHub; these links point at the commit this page was built from.

Litl keyboard: common questions

What microcontroller does the Litl keyboard use?

The Litl keyboard is built around the ProMicro, from the AVR/Arduino family.

How big is the Litl keyboard PCB?

The Litl keyboard measures 248.3 × 99.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Litl keyboard?

103 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the Litl keyboard design files?

From the mohoyt/litl repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Litl keyboard 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 Litl keyboard 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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