I have always loved designing circuit boards. However, It is a while that I had to abandone my design desk and work on software. Here are some of the projects that I have done before. 

Line Tracking Robot, which ranked first among 12 robots in the first robotic competition at Mazandaran University, April 2002.

ATMEL 89C Series Flash Microcontroller Programmer, February 2003.
I found the original design in here but the circuit board and PCB design with some modifications was for me.

Temperature Controller for Water-Based Air Conditioner using 89C51 Microcontroller, July 2002. 

Wireless Explorative Vehicle with Rotatable Camera, September 2004