A group of engineers at CERN in Switzerland have had a lot of fun doing a “hack-a-thon” to develop a cheaper ERGO pixel based on an Arduino and an Android phone. It’s an amazing piece of work. You can follow their wiki here. Check out the “prezis” that introduce their project and report the results. http://www.citizencyberscience.net/wiki/index.php?title=A_cheaper_distributed_cosmic_ray_detector