Sure, Google Calendar is helpful, but ultimately it's on you to get yourself to that meeting. Wouldn't it be nice if the utility could handle some of the to-do list itself. Hack A Day scoped out an example of it doing just that, after a home owner named Shane posted a video of his DIY system that uses Calendar to control his heater. First, he connected a USB-powered mbed microcontroller with an ARM Cortex M3 processor to the internet via an Ethernet cable. As it happens, the mbed also has a temperature controller and solid state relay for turning the heater on and off.
Engadget
See also:
digitalhouse, DIY hack uses Google Calendar to automate home heating system (video)
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