A nother commom issue is timekeeping. This little module contains a DS3231 (or DS3232 with RAM) and the backup battery.

This is a multifunctional egg-timer. It has the following features:

I made this project as a side quest for a company. It was used in the production for fast and reliable testing at the end of line. 

I happened to find an old Game Boy camera on a jumble sale. The thing as such is not worth much, got it for a few bucks. But the image sensor can be used to make low-res pictures using a microcontroller with an ADC.

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.

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

Measuring current in a design used to be a bit tricky. But with modern semiconductors this is no more effort than a tiny module with an I2C bus. It only needs three resistors and two capacitors. I used this IC in the Read more

This is a simple two channel remote control. It controls two mains outputs. It protects the consumer from being switched on and off too fast.

This little double sided PCB is a galvanic insulator for the popular Atmel ISP MK2.

This little nifty (outdated) box enables the user to connect one keyboard to two PC's. Read more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).

After I had a little mishap with my Saleae Logic that ruined the analyzer and parts of my PC it was clear that some galvanic protection needed to be implemented. 

Read more