This is a RGB effect helix lamp. It has several light modes, an IR remote control and can also rotate. 

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This is an octagonal LED matrix made of 213 LEDs. It features sand and PIC/FLIP fluid simulations, Conway’s Game of Life, and several interactive demos. Each LED can be dimmed from 0 to 100% in 1% steps using a logarithmic brightness curve that matches human perception.
Its main components are an STM32G441 microcontroller and a BMI323 IMU. The LEDs are driven by an IS31FL3763 matrix driver. 

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Everyone knows the slightly annoying Simon game. I made a very simple one around 20 years ago (here). I’ve now made a new one that adds several "annoyances" to the game. The outcome is that the game is almost unplayable for a human without going crazy. Just as I wanted it to be. This tests not only your memory but also your resilience to distractions and your concentration. 

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This is a micro Tetris. It features a fully functional Tetris programmed in C with the free TI Code Composer Studio. Read more

The device is built out of two servos. One provides the rotation and the other the tilt. It can be used for example to point at the date on a wall calender (sample below). Read more

This is a prototype that implements the concept of a physical progress bar. It is based on a motorized studio fader that is connected to a microcontroller. Read more

This is the bigger brother of the Temp-p-clock. It has a 128x64 pixel display with a touchscreen. Read more

I just had to build a robot that was called "Gizmo". It was actually just a fun project. Read more

This is a 16x16 LED matrix. The picture is scanned at about 60 frames a second. The program has an entry menu and is written in C. Read more

The well known "4-In-A-Line" game. It is powered by an Atmel AVR AT90S2333. You can either play against the computer or a second player. Read more