HI, everyone, I'm wondering if you can give me some design suggestions for my project. My goal is to turn on the furnace fan in my house when the temperature of the upper level is more than 3 or 4 degrees different from the lower level (and then turn it off again when the temps agree). My original plan was to use an electric imp on both the upper and lower level of the house, sense and transmit the temperatures to online data storage, then send an HTTP message back to one of the imps when the temperature difference reached 3 or 4 degrees and the imp could turn the furnace fan on/off via a relay. So far, I've been able to send data to Sparkfun Data, Thingspeak, and Wolfram, but I haven't figured out to detect the temperature difference and send a message back. Does anyone have suggestions about how to do that? Or is this design way too complicated for what I want to do? It's not very practical to run a direct wire connection from the upper level to the lower level of the house, so that's why I am trying to do it wirelessly. Thanks in advance for any suggestions.
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