Auber (PID company) sells a bunch of smoker-specific stuff. Also, do a Google search on those terms. There are forums out there with build threads to do exactly what you are looking for. I read through one lately where the guy's PID was connected to a computer fan which in turn regulated the smoker temp (somehow). That build thread had a huge number of pictures.
Believe and you will find your way.
A promise lives within you now....