https://zdenekru.github.io/A technical blog for documenting and sharing projects. 2026-11-06T16:42:43+01:00 Zdenek Rusek https://zdenekru.github.io/ Jekyll © 2026 Zdenek Rusek /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2026-08-08T10:30:00+02:00 2026-11-06T15:24:54+01:00 https://zdenekru.github.io/posts/sizeable-vram-issue-linux/ Zdenek Rusek

Sometimes a software problem is not really a software problem. This story started with Steam crashing on my CachyOS installation. Or, more precisely, Steam itself appeared to work, but several steamwebhelper processes were crashing in the background. At first, this looked like a typical Linux desktop problem: perhaps Steam, Chromium, Wayland, VA-API, Mesa, or one of the many layers between th...

2026-06-29T12:00:00+02:00 2026-07-25T20:56:36+02:00 https://zdenekru.github.io/posts/edice-part3/ Zdenek Rusek

Waiting game is over. The package from JLCPB arrived and I’m happy as a clam! Colors are as they supposed to be (well, it’s green…), mask is legible - QR can be easily scanned, 0805 parts are nicely soldered and most importantnly VQFN chips are in their spots and in correct orientation! Thanks a lot JLCPB (#notsponsored). 1. The Smoke Test: Waking up the ATtiny1616 Before writing a...

2026-06-27T12:00:00+02:00 2026-06-30T20:09:30+02:00 https://zdenekru.github.io/posts/edice-part2/ Zdenek Rusek

With the schematic fully locked down and validated, it was time to move from the abstract world of logical connections into the physical reality of copper, fiberglass, and solder paste. The goal for Part 2 was clear but brutal: squeeze an MCU, an accelerometer, seven WS2812B-2020 LEDs, and a massive CR2032 battery holder onto a tiny, pocket-sized PCB without compromising the clean, cyberpunk a...

2026-06-25T12:00:00+02:00 2026-07-25T20:40:03+02:00 https://zdenekru.github.io/posts/edice-part1/ Zdenek Rusek

A few days ago I saw a simple pcb on my colleagues (L.Ch.) desk. A simple electronic toy, a dice with LEDs. It got me thinking “Can I do something like this? It shouldn’t be that hard” and would be nice, interactive exercise. That was the start of project “e-Dice”. The goals are: 6d dice cyberpunk-ish estetic battery powered ATTinyXX as a core accelerometr as a source of RNG small...

2026-05-31T12:00:00+02:00 2026-05-31T22:52:00+02:00 https://zdenekru.github.io/posts/zdenduino-part6/ Zdenek Rusek

Yesterday I couldn’t stop thinking how to move forward with ESP32C3 and especially that the test case #4 from my last post was kinda sorta not enough (built in a rush with a hot needle). I knew I could do more. So I sat down and after a lot of deliberation of why the ** I cant upload an image to ESP32, I decided it is time to split the project properly and make dedicated backend and frontend p...