Just joined, as I have been wanting to do a christmas light display, for many years. And, just before the holidays, the wife mentioned that she would like our lights to "dance to the music." W/ that said, I picked up an Uno and Mega 2560, along w/ some relay boards. I may opt for SSR boards.
Programming isn't really my thing. But, I have a bit of an electronics background (20+ years).
Can anyone direct me where I can go to pick up how to put it all together and make something work? Please, and thanks.
Update: Just realised you are talking about controlling lights you already have but I will leave below in case of interest / use
You would probably be best looking at neopixels as they are easy to wire up and very easy to program with a library.
There are lots of Youtube videoes etc. on how to get started. Although probably not a good place to start you may like to have a look at what "Dave's Garage" does with them https://www.youtube.com/watch?v=COJnlehBcKw
Seriously consider solid state relays with zero cross, this will keep the EMI to a minimum and also allow you to dim the lights. I am assuming the lights are mains powered.