BigE

So it sounds possible but not very practical for someone who isn't overly savvy with logic circuits? Maybe I should just get the Netduino Plus? I still can't find where to purchase them. Are there none for sale?

Thanks for your responses. Phil: That is similar to what I am trying to do, but mine is far simpler! I want to interface with my mechanical padlock to unlock a door via my phone. In order to interface with the deadbolt, I need to be able to close the circuits to the right pins of the numeric keypad in the right order. Perhaps I don't even need a Netduino? This might be a dumb question, but can I simply use different pin combinations of a PC's RS-232 port (and some programming with .NET's System.IO.Ports) to close 6 independent circuits on command? (5 numeric keypad buttons, and a 6th "lock" button) Or would I need some hardware with more logic (i.e. the Netduino) and perhaps Chris' approach with the serial connectivity? -E

Awesome! So I could theoretically have an application running on the server handling incoming commands, and send responses over LAN via TCP/IP to the Netduino Plus? That would be great! I would definitely be intereseted in the Plus, but are there any left? I found the tech specs page but don't see anywhere to buy them... Also, I was unaware of the mini RS-232 ports (available in both models). Could I communicate to the Netduino/Netduino Plus via a serial port (or perhaps even a USB-to-RS232 converter cable, if the server doesn't have a serial port)? Thanks, and please forgive any hardware ignorance I might shown