m20

m60 5x4 in lego¶

an ortholinear keyboard set in lego 5x4 with optional encoders, leds and oled

this is part of a bigger family of ortholinear keyboards in lego see for reference https://mlego.elena.space

status: tested all ok

Features:

5x4
1 encoder, optional
led strip, optional
5 pins MX or choco v2 switches
Raspberry pico 2040 or compatible clones
oled, optional
firmware qmk
tht or surface mount diodes

render¶

3d render

pcb¶

printed one

bom¶

1 RP2040 or compatible, we act, teenstar
20 signal diodes 1N4148 , do-35 or sod123 (updated gerbers to support them)
1 encoders
1x510Ω - for led so you may have to compute the R to match your colours and desired brightness.
1 leds
2x20 pin DIL/DIP sockets whatever you prefer and headers to match
led strip 3pins
5 pin MX switches 20 or kailh choco v2
lego 16x16 plates for bottom, and bricks/tiles as you please

case¶

case information can be found here

assembly¶

this is a very rushed assembly guide but shall give you the main idea.

gerbers¶

gerbers ready to be printed at jlcpcb are available

rev 1

full kicad project if you want to generate your own or modify is available here kicad symbols/footprints are in the m65 repo

firmware¶

   git clone --recurse-submodules -b mlego https://github.com/alinelena/qmk_firmware.git qmk-alin
   cd qmk-alin
   qmk compile -kb mlego/m20/rev1 -km default

   # or the old way
   make mlego/m20/rev1:default

pins¶

columns: "GP1", "GP6", "GP7", "GP8"
rows: "GP9", "GP10", "GP11", "GP12", "GP13"

Encoders

Pad_A: GP4
Pad_B: GP5

Leds

Leds	Pin
NUM_LOCK	GP14
SCROLL_LOCK	GP25
RBG_DI	GP0

Oled

SDA: GP2
SCL/SCK: GP3

m20