Adding a PID to the roaster.

I have decided to add a PID to the roaster, Thus reducing temperature overshoot and in many cases under temps during roast times.

Here are a couple of pictures of the project so far.

PID controller stands for proportional–integral–derivative controller


In simple terms, here's an analogy :

Your driving on the freeway and you see the traffic slowing down ahead,  do you speed forward at normal speed until your there and braking is eminent less you plow into the car in front of you..

Or do you back your foot of the gas, and cruise up to the slowness slowly..until you match the changing traffic speed.