I have been spending a lot of time starting to think about my control system now that the basic system is running like a charm and reading alot of the older threads here. I feel quite confident that I could do all the basic controls I need to using just a few relays and aquastats, but in addition to my control logic, what I really would like to be able to do is having detailed monitoring and logging functions that I can view from my PC (and possibly the web or on my iPhone). From the little I have read about the Arduino board, it would definitely be an OK choice to use as my basic control system building block(maybe not the best, but seems to offer a lot for a little bit of money), I am less clear if it has the capabilities (built in or add-able) to allow it to log data from a dozen or more temp sensors, as well as all the other things I might like to monitor(zones open/closed , circulators on/off, outside temps etc). Anyone know off hand if that Arduino is up to the task for that type of thing(monitoring and getting the data into my PC)? or is it then asking too much of such an inexpensive unit? In an ideal world the data it collects would be funneled into my PC in near real-time where I could built the rest of the reporting interface I need.