What is it about?

Well about me, Martijn Casteel, as easy as that!

A lone writer, writing about some thrilling encounters mainly in IT. First exciting point to elaborate; Who am I? Quoted from a strange movie with Jackie Chan. Well I'm not that old (yet) and I do like programming.

I'm an IT guy, I've studied Computer Science and Technical Artificial Intelligence. The latter is quite long and I have to explain it every time, so the short version is I'm building Jarvis.

I like watching movies among many other hobbies you may, or may not, find out reading my blog!

In between projects

20 September 2019

At the moment I’m in between projects, I worked a lot on koala. It has been five years since we started this project, and it was fun to do. Other members of the study association are continuing work on koala.

At the moment I’m planning a new project. A 16 by 16 led frame for animating images. I have my inspiration from the Game Frame, a project by Jeremy Williams. However his Game Frame is sold out. So I’m planning to create my own. I have bought a WS2812b led strip for my first build and a picture frame. I would like to use a PCB prototype manufacturer, perhaps even with SMT assembly.

Instead of using an Arduino, I will be using a Raspberry PI Zero W. A few plans using this additional computational power; using a web interface to add, order, and remove animations. The device should create a network if none is configured, after reboot the configured wifi is used. And finally, the web interface could get an editor to create animations painting any of the 256 boxes.

Chat over websockets

24 November 2017 Hello there!

A new small project, something to play around with. A chat application that allows people to chat on my webpages using websockets.

  • martijn Hello! First of all welcome to my blog, this is a chat window you can use to chat with anybody.

    Due notice that the chat is not private so anybody can read your messages! For any questions contact me at
  • martijn The chat client is currently disabled, since it wasn’t use by anyone.
martijn is typing…

This small project is made using NodeJS, I tried NodeJS before but I didn’t like it that much. However for websockets I think it’s the tool to use. For the application I used which helps a lot; creating a connection, trying to reconnect, and sending messages to the connected sockets.