Open doors with a Raspberry Pi and RFID module
People who let their cats outdoors at night know how difficult it is to get up at 3:00am to let the cat back inside. The alternative is to build a cat door, but then you run the risk of inviting other animals into your home. Help is on the way with an RFID-controlled door that truly allows only your cat to get inside.
RFID Technology
Radio frequency identification (RFID) technology uses radio waves to identify objects. This technique is older than most would believe. Friend or foe recognition by means of secondary surveillance radar was already in use during the Second World War. Today, RFID is applied to all kinds of object identification tasks, access control, anti-theft security, and even card payment systems.
An RFID system consists primarily of a transponder and a device that can read the transponder ID. In simple terms, the reader creates an electromagnetic alternating field that provides power to the transponder. This causes the transponder to influence the characteristics of the alternating field in such a way that the reader can unambiguously identifiy the field.
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