Remote Cellular Switch

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My airplane is equipped with an oil sump heater which can be turned on an hour or so before flight to warm up the oil, leading to quicker lubrication at startup and hence less engine wear. Leaving it on 24/7 doesn't seem to be a good idea though, so there is the problem of getting it turned on before flight long enough to warm things up. That's what this little gadget is for. By sending an SMS to its phone number, the preheater can be turned on for a specified amount of time or at some point in the future.

I based this on a raspberry PI. They have plenty of GPIO and a 3.3v level RS-232 port which is perfect for communicating with most of the GSM modem chips out there. After I started I found this little guy which plugs right into a raspberry PI no extra wiring necessary: http://imall.iteadstudio.com/raspberry-pi-gsm-add-on.html

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