I posted part 3 of my blog series a couple of weeks ago and neglected to post a link here.
In part 3 I added the Nerf Gun Turret that Dexter has as one of the projects on this site: http://egoebelbecker.me/2015/07/07/raspberry-pi-and-gamepad-programming-part-3-adding-a-gun-turret/
Parts 1 & 2 are here:
I’ll be returning to the GoPiGo in a few weeks. I have a camera and sound sensor object on the shelf. I just need to finish a few other projects, including some code for a Mame cabinet I am working on with a friend. Feel free to sign up for updates via email.