WARNING: This project is still in its early stages. While it .. kind of flies ... it doesn't fly well.
Because I love ESP8266's so much, I figured adding one to a quadcopter wouldn't be so bad. Not really adding it to one as much as making it the brain, itself. This project surrounds my fun with the sensor platform and 4 motor controllers that might some day fly!
Unfortunately because of the lack of decent math libraries and efficient floating point arithmetic, the ESP module itself won't be able to do it very well.
It took me 1.5 seconds to calculate 32bytes of information (doing simple shifts and multiplications) on the ESP. They are just no good for math work.
PID loops on the ESP8266? Definitely looks like a fun project!