Homemade Data Loggers

Here is a list of some homemade data loggers that we have found.  Currently the list is in no particular order, but we hope to have it order in some way in the future:

Homemade Real Time Trackers

Real Time Trackers rock.  There is so much that you can do with them that it is just crazy.  Here is a list of some examples of how to make a real time homemade GPS tracker: