I've been working on this project for a while now, and most of the hard work is already done. I designed the circuit and layed out the PCB. I had the PCBs manufactured by DirtyPCBs. All the components have been purchased and are ready to go. As you can see from the pictures, I've been testing designs for the 3D printed case. I've also soldered one PCB and verified that the design works.

There are still a few things that need to be finished. I need to write the software for the AVR and test it. I also need to finalize the model for the case. After that I can begin printing cases and build a few finished units.