Chapter 4. RFID Meets Home Automation

Between my officemate and me, we have dozens of devices drawing power in our office: two laptops, two monitors, four or five lamps, a few hard drives, a soldering iron, Ethernet hubs, speakers, and so forth. Even when we’re not here, the room is drawing a lot of power. What devices are turned on at any given time depends largely on which of us is here, and what we’re doing. This project is a system to reduce our power consumption, particularly when we’re not there.

When either of us comes into the room, all we have to do is tap our key fobs on a reader mounted by the door, and the room turns on or off what we normally use. Each of us has a keyring with an RFID-tag key fob. The reader by the door reads the presence ...

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