I’m kasterby. I build things, take things apart, and write down what I learn.

This site is my personal notebook for software engineering, hardware hacking, reverse engineering, and the occasional repair. Some posts are short practical notes; others follow projects over months.

keebx, my custom keyboard and firmware project, is the longest running thread here. It covers the PCB, an RP2040, displays, keypads, sensors, RGB, and a TinyGo firmware.

I’ve also preserved older material from my previous Notion site. Archive labels mark content that may no longer be current, but the original text, dates, images, and downloads are kept intact.