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  • Good point. I think the best thing to do at this point might be to revisit the code, clean it up, resolve any errors, and make sure there isn't any undefined behavior. It might be a waste of time to compare the binaries if the code has inherent problems. I'm going to try to refactor some of it and see if the discrepancy still exists. Thanks for the tips and for catching that array out of bounds problem! Commented Jul 3, 2015 at 8:36
  • @Hendeca: I tried some minimal cleanup on your code. Check your github repo for the pull request. Commented Jul 3, 2015 at 11:05
  • Thanks very much! Very helpful. We will test this out and keep refactoring from there. Also, this is collaborative and I was unaware that this is an earlier version of the code. I'll edit the question to point to the new version of the code. I will likely just do the same changes you made in your pull request to the newer sketch. If you so desire, feel free to put in another pull request on the new sketch. Sorry about the confusion and thanks again for your help, it's much appreciated! Commented Jul 3, 2015 at 18:34
  • The original code was contributed to by many different people over a long period of time. I went through and completely refactored and cleaned up the code. It now works and I believe that the array out of bounds problem was likely the culprit. To me it explains most reasonably why it would behave so different between two different compilations on different versions of the Arduino IDE. Accepting this as the correct answer. Thanks! Commented Jul 21, 2015 at 7:28