So, I took a look and it works beautifully. Their are 2 things I have questions about though. The tone length is very strict. If the tone is too short it wont work and if it plays too long it will put print the number multiple times. Is their any chance you could make it modifiable? Also, the goertzel algorithm is supposed to compensate for magnitude on its own. Is there anyway to account for that?
Again, great job and thanks for your help!
Moose