Yes, that is helpful, and I totally agree about the waste of money (it gets up there for sure). I would love to not need to use something similar, but I need all 16 relays where as as you described I could get 12 with Arduino by using every single digital pin. I did not mention earlier, but I also need 2 pins for a planned serial LCD and 2 more for a keypad (or maybe not depending on how I use the keypad). This would limit me to even less relays.
Perhaps my question should be - How did they do this serialy addressible board, and could I do it with Arduino? - So I can make my own.
- OR -
How can I address 16 relays and still leave room for 2 other serial devices?
After looking around some - I think I want an I2C setup:http://en.wikipedia.org/wiki/I2C
I have more reading to do there, and may find my own answer, but can anyone point me to an example for this on anArduino?
Thanks so much for the help and the quick reply!