Astro-Beano

Novice astronomer and photographer near Dundee, Scotland, starting out with his first telescope. Also dissects webcams & puts them in bird boxes, and tinkers with Raspberry Pi projects.

Tuesday, 27 January 2026

Small girth 8 graphs for keyboard wiring

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This post is a less interesting follow up to my recent catalogue of girth 6 graphs for keyboard wiring , which give 4-key roll over (4KRO). ...

Tuesday, 30 December 2025

5-way switch in a diode-free Graph Theory keyboard

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My first post about keyboards introduced the idea of Graph Theory applied to keyboard wiring . I have since used the girth 8 Tutte-Coxeter G...

Monday, 22 December 2025

Almost a year of DIY Mechanical Keyboards

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I did a retrospective in August of how looking for a replacement keyboard led up to building a Ergonomic Mechanical Keyboard with a self-de...

Tuesday, 2 December 2025

Slump52 - an ErgoMech keyboard with number pad

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Up until now, I have had three different keyboard PCBs fabricated to my own design - all diode-free using Graph Theory. The Gamma Omega TC36...

Friday, 28 November 2025

Small girth 6 graphs for keyboard wiring

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This post is an expanded and reworked version of the table in my first keyboards and Graph Theory blog post , listing the best (in terms of ...

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