Sparetime
This is how I like to spend my time when I’m not at work.
Cycling
If you ever see a rider with I BUILD ROBOTS on their jersey, there is a good chance it's me.
Hydroponics
I always loved the idea of automating (or at least continuously monitoring) the cultivation of plants. I started with deep water cultures for tomatoes, chillis, and basil. Currently settled down with a vertical tower design.
PCB Design
The look of a properly manufactured PCB is so much more enjoyable than a breadboard. Apart from the fact that it is a major restriction to do without SMD components.
3D-Printing
Anyone who owns their own 3D printer knows that 3D printing is mostly about designing and printing things for the 3D printer.