Over the last two years I've contributed to and taken from a number of threads on this (excellent) forum regarding my solar tracker prototype. Rather than trawl through all the threads and update, here's a new one.
It's now working, you can see it here:
http://solarflower.blogspot.com/2011/03/well-main-news-is-that-device-now-works.html
And the Facebook group for those so inclined:
http://www.facebook.com/home.php#!/home.php?sk=group_184038684971498&ap=1
Thanks heaps to all for the quality input which has made this whole thing possible.