This version of the project is coming to a close, after doing some power optimization and final stability testing I will be moving on to trying to use the AT86RF233 to do the ranging. Its cheaper, lower frequency, and has considerably lower RX current consumption. In a separate project I will be seeing how that works out, if its performance isn't as good as I like I may come back to the DW1000 chips.

I have a design right now that I'm hoping will last more than a year on at 10mm lithium coincell. It primarily saves power by using a vibration sensor so it only updates the cats position every 30 minuets or when they are moving. I'm also considering sending an "I'M HERE!" TX burst every 2 minutes for fast out of range alerts. Its smaller than the buckle on my cats collars. I'm calling it the YoctoTrack. Hopefully will have a project page up for it soon. The blue ring in the layout is 10mm in diameter. The whole board is smaller than a dime.

I have linked a repository with all the code and schematics if anyone wants to replicate my design or needs a reference to work off. There will be further posts detailing how to build/program/setup the server for this project. But the rest is really just a clean up and instructions, no new designs.