Right now I've got a 75 Gal. saltwater tank with a lonely tang in it.
I was going to use a fancier led driver, but since the led's are 5 watts each and i'm hooking 5 in series per driver the wasted energy amount to only about 1% per driver which is fine by me. I kind of want to balance cost with function so the lm317 is a good choice for me.
Thanks for the i2c lcd driver link. If there's a library written for it I'll probably get them from there instead.
I can't wait to finish the board and get it built too. I had it finished twice already, but decided to add in more stuff. I'll keep you guys posted and might need some help.
Oh yeah, before I go... I found the coax connectors for PH and ORP sensors so you don't need to cut cut off the connector 