HardLabs

Bottom plate

ssbb·tako·rev1/plates/bottom/bottom_plate.kicad_pcb

Bottom plate PCB layout, top view — open source AVR/Arduino board by ssbb

About the Bottom plate PCB

Bottom plate is an open source AVR/Arduino PCB design by ssbb, published on GitHub under the MIT license. It is a 2-layer board measuring 114 × 97.8 mm, with 5 components from 4 distinct parts.

Its main chip is the STeMCell, from the AVR/Arduino family. By type, the board carries 1 IC and 1 connector.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

34 key EC split keyboard

Tako is a vertical stagger split keyboard with electrostatic capacitive (EC) non-contact switches.

Depending on which parts you are going to use, make sure to select the proper top plate (OG or NIZ). Ensure you use the correct thickness - the OG (OEM, Deskeys, etc) plate should be 1.2mm, and the NIZ should be 1.6mm!

RP2040-based boards should be used for wired build - Liatris, Frood, Sea-Picro, Splinky, etc.

Bottom plate, from the project README
From the project README

Main components on the Bottom plate

STeMCell

Bottom plate bill of materials (BOM)

5 components, 4 distinct parts.

QtyPartRefs
1
STeMCell
U1
1
MJ-4PP-9
J1
1
nice!view
DISP1
2
MountingHole
H15, H16

Bottom plate design files

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

Bottom plate: common questions

What microcontroller does the Bottom plate use?

The Bottom plate is built around the STeMCell, from the AVR/Arduino family.

How big is the Bottom plate PCB?

The Bottom plate measures 114 × 97.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bottom plate?

5 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bottom plate design files?

From the ssbb/tako repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Bottom plate design in my own project?

Yes, under the terms of its MIT license, which ssbb chose for the repository.

Can I test firmware for the Bottom plate 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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