Proportional, Integral and Derivative or PID control systems have been around for a very long time, but they are still not very well understood.
Recently I convinced Fred to give a bit of a talk on the subject.
Good thing with robots, is convincingthem is just a case of programming them :-)
Here is the video of Fred's presentation.
For those of you who are interested, Fred is powered by A Raspberry Pi 3 running MRL-Manticore
There is a series of videos of how this head was assembled, the installation of MRL on the Raspberry Pi 3 and the programming to make Fred come to life.