Thanks for the pointers. I think they will give me the start I need.
There is no need to ask Ian re: open source for the clock kit related to my aquarium controller. The web site code pointer is what I needed.
I'm sure Ian knows that making the clock kit open source could open the possibility of people added other enhancements to the clock firmware. The opposite side of the coin is the risk of someone pirating the software. As a former software product developer who has had his products stolen and cloned, I can relate to the concern.
Thanks again for the pointers, they should be enough to get this project going.