I now have my wc 2.2.2 up and running with a whopping one temperature sensor, so now want to play with input. I have several alarm sensors that I want to monitor. It basically just closes a switch inside, right? So, can I just put 5 volts from the wc on one side and route the other to the input pin for TTL in? There are no resistors or anything, just a switch. Any advice would be appreciated.