iiinova — where your digital self keeps evolving

Koen van Hove @koenvh.nl · 11/09/2026

Liander heeft de slimme meter vervangen en wat blijkt: Vattenfall denkt nu dat ik vanaf 3 september al 14861 kWh teruggeleverd heb met mijn vijf zonnepanelen. Dat is genoeg stroom voor zes huishoudens voor een jaar.

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Koen van Hove @koenvh.nl · 30/08/2026

I have been working on making a soundboard for fursuiting. Sadly I am not feeling well, so no demonstration in suit, but here is basically how it works. I still have to settle on which sounds to include.

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Koen van Hove @koenvh.nl · 24/08/2026

I had a lot of fun fursuiting for the first time at Eurofurence this year. Sadly I got sick on the last day, but I'm not going to let that spoil all the fun I've had. (Photo by @tomby.bsky.social)

Me standing in raccoon fursuit on the central square before the CCH at Eurofurence 30

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Koen van Hove @koenvh.nl · 10/08/2026

I have been playing around with generating my own SVG files for Pacenote Pal. I made a simple application that records my coordinates and distance in the stage, and with that I can draw a map like this for the stage Severn - Afon Bidno (converted to PNG for Mastodon):

A rally map of Severn - Afon Bidno from Assetto Corsa Rally

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Koen van Hove @koenvh.nl · 14/07/2026

A couple of days ago I received my outside temperature and humidity sensor that connects to my Home Assistant (via Zigbee). Now I don't just sleep badly, I can also back up with data why.

Two graphs showing the temperature outside/inside and the humidity

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Koen van Hove @koenvh.nl · 02/07/2026

I made some signs. I'm not quite sure where to put them, but I am sure I can find a use for them.

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Koen van Hove @koenvh.nl · 28/06/2026

Elke dag dat ik iets wil doen afgelopen week lijkt er wel weer een nieuwe onaangename verrassing voor de deur te staan. De verrassing van vandaag: hagelschade aan de auto.

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Koen van Hove @koenvh.nl · 18/06/2026

After about a year of flying outside my flat, my pride flag started to tear itself apart. So time for a new flag! This time I went for 160 grams spun polyester rather than 115 grams gloss polyester. Hopefully it lasts even longer :-)

The old and new pride flag next to each other

The new pride flag flying from my balcony

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Koen van Hove @koenvh.nl · 14/06/2026

Al een jaar of vijf loop ik rond met mijn "giropas", een ING-pas met eigen "foto" op de voorkant. Het zorgt nog steeds voor leuke reacties :-)

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Koen van Hove @koenvh.nl · 17/05/2026

In two weeks it will be pride month. As LGBTQ+-acceptance is under pressure (especially the T), consider doing something to show your support. Personally I have a rainbow flag waving outside my flat, and carry a tiny Blåhaj in the back of my backpack.

A rainbow flag waving in the wind at sunset

A tiny blahaj poking out of a backpack that is put on the ground

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Koen van Hove @koenvh.nl · 08/04/2026

Ik heb nieuwe theedoeken nodig, maar ik vind de theedoeken van de HEMA e.d. wat te gewoontjes. Ik ben gaan knutselen en heb nu een Rijkstheedoek gemaakt, geschikt voor elke Rijksafwas. In de toekomst wil ik allicht ook een Rijkshanddoek :-) Meer ludieke ideeën zijn welkom!

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Koen van Hove @koenvh.nl · 03/04/2026

My submission to SIGBOVIK this year, titled "Too Long; Dye't Red: Doubling the Effective Number of Pages Using Stereoscopic 3D Printing". For those without a pair of 3D glasses, here are some pictures to help you read this tremendous advancement in information density.

The paper, using both cyan and red lettering, going through each other.

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Koen van Hove @koenvh.nl · 01/04/2026

Greetings! I was thinking: what if we can use the DNS for more than just questions and answers, but also for conversations? That's why I started working on ircns (ircns.koenvh.nl) to combine the best of DNS and DNS tooling like `dig`, `kdig`, and `drill`, with the modern chat protocol IRC.

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Koen van Hove @koenvh.nl · 15/03/2026

I just managed to make another watchface, this time (pun intended) it's always 11 AM, but the timezone changes every hour to where it's 11 AM in the world.

A watch showing "11:27" with underneath in smaller letters "Pacific/Pago_Pago"

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Koen van Hove @koenvh.nl · 11/03/2026

Tien jaar geleden was de blockchain een enorme rage. Veel publieke organisaties zijn in die tijd een blockchainpilot gestart. Ik heb bij twaalf van die organisaties nu gevraagd hoe het daarmee staat. Hier is een kleine greep uit de pilots die tien jaar geleden gestart zijn:

# Overzicht van alle blockchainpilots

## Pilotronde 1 – oktober 2016 – maart 2017

| Gemeente | Blockchainpilot |
|---|---|
| GR Drechtsteden | 1. Gehandicapten parkeerkaart<br>2. Interne facturatie |
| Gemeente Den Haag | Inrichting subsidieproces |
| Gemeente Schiedam | Gehandicapten parkeerkaart |
| Gemeente Stichtse Vecht | Invoering ‘Zorgcoin’ |
| Gemeente Amsterdam | PGB-proces |
| Gemeente Utrecht | Registratie afval |
| Gemeente Eindhoven | Vereenvoudiging notariële akte |
| BAR-gemeenten | Evenementenvergunningen |

## Pilotronde 2 – januari 2017 – december 2017

| Gemeente | Blockchainpilot |
|---|---|
| Gemeente Barneveld | Duurzaamheidsleningen |
| Gemeente Breda | BredaPas – inkomensafhankelijke kortingspas |
| Gemeente Arnhem | GelrePas – inkomensafhankelijke kortingspas |
| Gemeente Zuidhorn | Aanvraag, toekenning en afhandeling van minimaregeling Kindpakket |

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Koen van Hove @koenvh.nl · 16/02/2026

Sinds afgelopen weekend gebruikt het Rijkspodcastregister geen Spotify meer als speler, maar direct de bron van de podcast. Helaas zijn daardoor 35 podcasts niet meer direct te beluisteren, omdat die exclusief bij Spotify beschikbaar zijn. rijkspodcast.koenvh.nl

Een screenshot van het Rijkspodcastregister - sommige podcasts zijn enkel op Spotify beschikbaar

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Koen van Hove @koenvh.nl · 12/02/2026

Mijn smartwatch is aangekomen en: het werkt. Ik kan nu elke minuut (voor 20:26) een gebeurtenis zien uit dat jaar. Staat nog niet in de Play Store, maar de code is hier te vinden: github.com/Koenvh1/Hist...

Een smartwatch waarop staat: 1814 - In opdracht van de geallieerden wordt baron Frédéric Auguste Alexandre de Beaufort-Spontin gouverneur-generaal van België.

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Koen van Hove @koenvh.nl · 07/02/2026

In de categorie impulsaankopen heb ik nu een tweedehands Samsung Galaxy Watch 4 gekocht zodat ik m'n wijzerplaat ook in het echt kan testen. Vanwege de manier waarop het Watch Face Format (WFF) werkt, heb ik een keten van ternaire selectieoperators van 899 KB groot (4941 mogelijkheden).

Wear OS in een emulator. De tijd is 1348. De boodschap is "Er vindt een grote aardbeving plaats in de regio Venetië, waarbij honderden gewonden vallen en gebouwen worden vernield."

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Koen van Hove @koenvh.nl · 07/02/2026

Ik ben bezig met mijn historische klok [1] om te vormen naar een wijzerplaat voor Wear OS [2]. Het lijkt te werken, maar de ironie is dat ik zelf geen horloge heb waarmee ik het kan testen. [1] koenvh.nl/playground/h... [2] github.com/Koenvh1/Hist...

Een horloge in een emulator. Te lezen staat:

2001 - "cafébrand in Volendam eist het leven van veertien jonge mensen en meer dan 150 jongeren lopen ernstige brandwonden op."

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Koen van Hove @koenvh.nl · 02/02/2026

Continuing from yesterday: here is one of the problems I run into. The zone starts at that sign, but if you exit at the bottom right, the zone never ends. My algorithm subsequently considers everything as part of the no parking zone. Some signs that are there IRL are missing form the DB.

A screenshot showing NDW george. The zone starts but never ends

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Koen van Hove @koenvh.nl · 01/02/2026

I have been trying to use the national traffic sign database to map where street parking is allowed. I thought my algorithm was wrong at first, but it turns out quite a few no parking zones never technically end because the signs are missing (both in the database and in real life).

A map showing red lines on pretty much all the roads (and a few greens)

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Koen van Hove @koenvh.nl · 01/02/2026

Fun fact: Dutch traffic sign F16 (end of carriageway or lane reserved exclusively for trams) appears a grand total of 1 times in the Netherlands. Specifically here: www.openstreetmap.org?mlat=52.3601... / www.google.com/maps/search/... This makes it the least commonly used road sign in the country.

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Koen van Hove @koenvh.nl · 28/01/2026

I updated my website to make it better reflect what I'm currently up to, as well as get the styling a bit more consistent. One problem: my current website is now ~10 years old, and getting the build tooling working (or just finding the docs) is becoming difficult. Hurray for web dev. koenvh.nl

The front page of koenvh.nl, showing me behind my desk in the background, overlaid by the text "I am Koen - I am a researcher"

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Koen van Hove @koenvh.nl · 07/01/2026

I use Hashnode for my blog, and recently they changed the styling which wasn't to my liking. Luckily they also offer a way to make your own front-end (using Vercel), and after a bit of tinkering it is now working: blog.koenvh.nl Frankly I think it's an improvement over what it was like before.

A picture showing blog.koenvh.nl on a mobile browser

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Koen van Hove @koenvh.nl · 31/12/2025

DVDgotchi is now available on DVD. Ironically I did not have any writeable DVDs left over in a cupboard, so I had to order new ones, along with some DVD labels and sleeves. I think this basically completes what I wanted to do with DVDgotchi :-)

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Koen van Hove @koenvh.nl · 29/12/2025

With my newfound of DVD programming I had to create something, and it now actually works: Introducing the DVDgotchi. A tamagotchi clone implemented entirely using DVD menus. Works on any DVD player (and VLC). Source code and ISO available on github.com/Koenvh1/DVDg...

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Koen van Hove @koenvh.nl · 26/12/2025

Since 2019 I have made custom Christmas cards. This year was no exception. I decided to "write" a blog about them: blog.koenvh.nl/christmas-ca...

A picture showing seven Christmas cards I designed between 2019 and 2025

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Koen van Hove @koenvh.nl · 24/12/2025

Recently I've been looking into how DVD menus actually work, it's quite fascinating. A DVD player effectively runs a small VM where there are 16 16-bit registers that can hold variables. Buttons can set/read those variables. The standard library consists of only random number generator.

A DVD playing in VLC showing a keyboard from A-Z, -, . and ENTER.

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Koen van Hove @koenvh.nl · 22/12/2025

One of the things rsync does filter out are all the control characters before 0x20 except for \n and \r (when they appear at the end). This sadly means I can't use ANSI escape sequences to clear the screen. I did manage to play an ASCII version of Bad Apple!!, albeit slightly flickery at times.

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Koen van Hove @koenvh.nl · 21/12/2025

In further toying around with the rsync protocol, I have now managed to make it display more or less arbitrary text. Of course I quickly had to recreate the famous scene from The Matrix. (And for the DNS people, this means I can likely make the DNS over rsync output compatible with dig)

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Koen van Hove @koenvh.nl · 17/12/2025

Because I felt bad for all the DNS people having to miss out on the joy of working with rsync, I started on a DNS resolver over rsync. It should be mostly functional already. Feel free to try it out. The records appear as files, and the time is set to when the TTL will expire.

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Koen van Hove @koenvh.nl · 15/11/2025

Het Rijkspodcastregister is nu ook beschikbaar als Atom-feed: rijkspodcast.koenvh.nl/feed.xml

Een schermafbeelding van Thunderbird waarin de Rijkspodcastregister-atom-feed is geladen.

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Koen van Hove @koenvh.nl · 29/10/2025

Recently I've been playing The Farmer Was Replaced. There is something quite satisfying about seeing your algorithms come to life, especially as normally I'm too lazy to make a decent visualisation. In the open source philosophy, here's my final script: gist.github.com/Koenvh1/a8ca...

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Koen van Hove @koenvh.nl · 16/10/2025

Some time ago I bought a Stream Deck (I also wrote a blog about it), but I could never actually stream anything to it. That had to change. Recently I've been working on a plugin to stream live video to the Stream Deck. It works remarkably well:

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Koen van Hove @koenvh.nl · 04/10/2025

After 12 years of loyal service, my dashboard for Raceroom has stopped working. It was time for something new, which gave me something to tinker with again. I also just now caught up with all the added functionality from the last 12 years, like showing the current flag.

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Koen van Hove @koenvh.nl · 29/09/2025

One last addition to my PC (which had to arrive from China): two LED spotlights. Both because I like the look, and because I can more easily see that my PC is still on — it's so quiet most of the time I sometimes forget it is still running.

The inside of my PC case, showing two led spots illuminating up and down respectively.

The inside of my PC case as seen through the mesh window, with the brightness of the spotlights turned down.

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Koen van Hove @koenvh.nl · 20/09/2025

I have the uncanny ability to find really niche things to develop for. This weekend: a dashboard for Dakar Desert Rally. It only shows the speed, but that's all I need. Plus I learnt a thing or two about reverse engineering Unreal Engine and extracting values from running processes.

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Koen van Hove @koenvh.nl · 17/09/2025

Last week a parcel by @alexfursuitmaker.bsky.social arrived and I'm chuffed to bits with it - world, say hello to Rakoen (pronounced as Raccoon).

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Koen van Hove @koenvh.nl · 25/06/2025

Sometimes the simplest programming projects bring the greatest joy, like this button on my Stream Deck that allows me to turn the fan behind my simracing setup on and off (using a smart plug). It's really nice, especially with summer around the corner.

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Koen van Hove @koenvh.nl · 12/06/2025

As many people probably already know, I fly a rainbow flag outside my house. Not just during pride month, but pretty much year round. I hope that one day LGBTQ+ acceptance will be as self-evident as women's voting rights, but until that day there is still something to fight for.

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Koen van Hove @koenvh.nl · 03/06/2025

Good morning! Last weekend I made a clock where it's always 11 AM, just the timezone changes, so I can always say good morning. See it for yourself here: koenvh.nl/playground/1...

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Koen van Hove @koenvh.nl · 21/05/2025

After over two months we resume the cookie experiment at the University of Twente, this time using stroopwafels. Admittedly at this point I've stopped tracking the data.

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Koen van Hove @koenvh.nl · 04/05/2025

This weekend's project: PedalPal, an application that allows someone else to control your pedals in any racing game. I'm still tweaking with it, but it works very well so far.

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Koen van Hove @koenvh.nl · 26/04/2025

Some people have asked me "why does the Phone Book of the Internet" not support IPv6? The simple reason is that it just does not fit:

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Koen van Hove @koenvh.nl · 22/04/2025

As a small hobby project, I made booklets with the pacenotes for each stage in EA WRC. They are also available as PDF online if you want to print them yourself: koenvh.nl/wrc

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Koen van Hove @koenvh.nl · 17/04/2025

The Phone Book of the Internet is now a physical book! 1.5 kg and 600 pages of popular domain names and their IP address listed in alphabetical order.

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Koen van Hove @koenvh.nl · 01/04/2025

Whenever something doesn't work, it's generally the DNS. That's why we (re)introduce The Phone Book of The Internet. You can read more and download your own copy here: nlnetlabs.nl/news/2025/Ap...

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Koen van Hove @koenvh.nl · 23/03/2025

My submission for this year's SIGBOVIK: Ad Fund 'Em - a LaTeX package that automatically inserts adverts in your manuscript so you can monetise the space. You only have to add `\usepackage{adfundem}`. You can find the full text here: github.com/Koenvh1/adfu...

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Koen van Hove @koenvh.nl · 20/03/2025

I now printed the more permanent version of my illuminated logo - quite happy with how it turned out :-)

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