Andre Maia Chagas and his team, comprised of LL Prieto Godino, A Arrenberg and T Baden, have developed a Raspberry Pi-controlled microscope called FlyPi and entered it into the Hackaday Prize competition. Here’s what Andre has to say about the project:

Our plan with this project is to develop a complete opensource and cheap device for scientific experiments (data collection and analysis) and diagnostics (if they are “microscopy based”).
So far we were able to perform some proof of principle experiments in life sciences (Fluorescence and calcium imaging, opto and thermo genetics essays) and to perform diagnostics of the following parasites: Loa loa, Brugia Malayi, Wuchereria bankrofti, Schistosoma eggs, Mansonella perstans

It’s a fantastic and, above all else, useful project that combines that Pi with a camera module, an Arduino, 3D printed parts and various other bits and pieces. You can read more and see pictures and video here and also here.