Cosmic Pi - a low cost distributed cosmic ray detector, based on Raspberry Pi. It makes the detection and analysis of cosmic rays accessible to students, educators and ordinary people. It uses a specially designed detector combined with the low cost hardware of the Raspberry Pi computer for data storage and online analysis. More info at the Wiki page
If you're looking for the V1 prototype schematics and PCB layouts you can find them here Our more recent hardware (V1.5 and V2) plus all code is stored on github and can be found here To learn about the project, have a look at our blog
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The project hardware is currently being developed in EagleCAD but we'll be moving to KiCAD fairly soon.