HardLabs

Lagom

mohoyt·lagom·PCB/lagom.kicad_pcb

Lagom PCB layout, top view — open source AVR/Arduino board by mohoyt

About the Lagom PCB

Lagom 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 305.6 × 121.8 mm, with 167 components from 17 distinct parts.

Its main chip is the ProMicro, from the AVR/Arduino family. Other key parts include the 74HC138. By type, the board carries 74 diodes, 3 ICs, 2 connectors, 2 switches and 2 capacitors.

It belongs with the keyboards designs in this gallery.

From the project

Lagom is an easy to build 65% keyboard using a discrete microcontroller and only through hole components

Lagom kits are available for sale at sthlmkb.com

Lagom 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.

This the key layout and all option layouts exported from keyboard-layout-editor

Lagom, from the project README
From the project README

Main components on the Lagom

ProMicro74HC138

Lagom bill of materials (BOM)

167 components, 17 distinct parts.

QtyPartRefs
1
ProMicro
U1
2
74HC138
U2, U3
1
Conn_01x04
J1
1
Conn_01x03
J2
2
RotaryEncoder_Switch
SW83, SW84
61
KEYSW
SW_0, SW_1, SW_2, SW_3, SW_4, SW_5, SW_6, SW_7 +53
1
KEYSW
SW_6.25U_SPACE1
1
KEYSW
SW_7U_SPACE1
3
KEYSW
SW_ANSI_ENT1, SW_LSHF1, SW_SPL_SPACE_L1
5
KEYSW
SW_ANSI_\1, SW_LCOM_1.5U1, SW_LCTRL_1.5U1, SW_R_CTRL_1.5U1, SW_TAB1
1
KEYSW
SW_BCKSP1
2
KEYSW
SW_CAPS1, SW_RSHIFT1
1
KEYSW
SW_ISO_ENT1
8
KEYSW
SW_ISO_LSHF1, SW_LALT_1.25U1, SW_LCMD_1.25U1, SW_LCTRL_1.25U1, SW_R_CMD1, SW_R_CTRL_1.25U1, SW_SPL_SPACE_M1, SW_STEP_CAPS1
1
KEYSW
SW_SPL_SPACE_R1
74
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +66
2
0.1uF
C1, C2

Lagom design files

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

Lagom: common questions

What microcontroller does the Lagom use?

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

How big is the Lagom PCB?

The Lagom measures 305.6 × 121.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lagom?

167 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Lagom design files?

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

Can I use the Lagom 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 Lagom 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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