I have an old friend, Mark MacDonald, who has started up a business of solar tracking devices; Home Concentrated Solar Power, Home CSP; http://homecsp.com.
He is offering a lot of stuff including single and dual axis tracking controllers as well as temperature-differential controllers, linear actuators, and motor drives.
SolarMEGA1A single axis controller
From his site “Recent developments in microprocessors and embedded software technology have allowed the creation low-cost specialized controllers capable of the sophisticated analysis needed to make CSP convenient, practical, and affordable. By combining the latest micro-electronics technology with physics, and astronomy, and applying results to the needs of the home, a truly new paradigm of energy usage is possible.”
There is also info on Solar Boiler Hydronics, Heat Exchangers, Temperature Differential Controllers, and one of his latest endeavor compound parabolic trough project.
http://homecsp.com has information guides on projects plus a blog. He has some new stuff on a bicycle frame tracker. Although most stuff is too technical for me to totally understand Home Concentrated Solar Power is on the right track for affordable embedded software and electronics products for controlling all aspects of home solar systems.
So check out the solar tracking info and available products at http://homecsp.com.