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Can Passive RFID Be Used as a Reed Switch or Proximity Sensor?
Is it possible to program a reader to trigger an action if a tag is interrogated?
You can attach a tag to an object and use it to trigger a switch or detect an item's presence. When the tag is read, the object is clearly within range of the reader, so its presence has been detected. Most readers have input-output ports, so you can program a reader to trigger an action if a tag is interrogated. For example, you could have a diverter connected to a reader on a conveyor, and the diverter could activate when certain tags were read, but not others.
—Mark Roberti, Founder and Editor, RFID Journal
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