Hi,
I know that at least another Fuzzy library exists (eFll). But in any case I developed a Fuzzy library for Arduino that seems to me simple and fast.
I think that a controller like Arduino is a good candidate for Fuzzy logic use.
In my library I use Sugeno model and integer values for simplicity and speed.
Besides, a simplified definition and use of Fuzzy Controller is also included.
One help and a couple of examples are provided.
Because I'm confident in profitable use of fuzzy logic in many circumstances where Arduino is used, I suggest to the Arduino team the choice of a useful fuzzy library and its inclusion in libraries list in IDE.
My contribution is the library attached.
I will appreciate any comment and review (even if very negative 
).
Thanks.
FuzzyLib21.zip (537 KB)