HardLabs

Mxtoggle

sjgray·CBM-MX-Keyboards·MX-Toggle/mxtoggle.kicad_pcb

Mxtoggle PCB layout, top view — open source AVR/Arduino board by sjgray

About the Mxtoggle PCB

Mxtoggle is an open source AVR/Arduino PCB design by sjgray, published on GitHub. It is a 2-layer board measuring 29 × 21.8 mm, with 12 components from 10 distinct parts.

Its main chip is the ATtiny214-SS, from the AVR/Arduino family. Other key parts include the CD4066BM. By type, the board carries 4 resistors, 2 ICs, 2 connectors, 2 diodes and 2 capacitors.

It belongs with the keyboards and retro computing designs in this gallery.

From the project

Replacement and enhanced keyboards for Commodore machines

CBM MX Keyboards Project Steve J. Gray ========================

This is a project to create replacement keyboards for CBM Machines using standard MX keyswitches. The first goal is to create direct replacements that fit standard CBM cases (if possible).

Keyboards are identified by a string in the following format:

where: KB is the keyboard name Vn is the version#. This is a unique design/layout of a specific keyboard. Rn is the revision#. Generally updates to a specific keyboard version.

Main components on the Mxtoggle

CD4066BMATtiny214-SS

Mxtoggle bill of materials (BOM)

12 components, 10 distinct parts.

QtyPartRefs
1
CD4066BM
U2
1
ATtiny214-SS
U3
1
HEADER
J1
1
UPDI
J7
1
POWER
D1
1
SL-LED
D3
2
0.1uf
C5, C7
1
330
R1
2
R
R2, R3
1
470 ohm
R9

Mxtoggle design files

The KiCad project lives in the sjgray/CBM-MX-Keyboards repository on GitHub; these links point at the commit this page was built from.

Mxtoggle: common questions

What microcontroller does the Mxtoggle use?

The Mxtoggle is built around the ATtiny214-SS, from the AVR/Arduino family.

How big is the Mxtoggle PCB?

The Mxtoggle measures 29 × 21.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mxtoggle?

12 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mxtoggle design files?

From the sjgray/CBM-MX-Keyboards repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mxtoggle design in my own project?

The repository has no license, so all rights stay with sjgray. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Mxtoggle 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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