Right now it relies on 4 temperature sensors and two controllers with four relays each. Only six of those eight are being used. Those controllers handle multiple RIP relays which in turn shuts pumps on or off.A few more input sensors might be nice and at least the eight outputs I have maybe more. A couple years ago I bought the Arduino Duemilanove to play with and see if it was something I could use but I got busy and never got back to it. Now I see the Duemilanove is not produced anymore.Any advice would be greatly appreciated.