General Question

intro24's avatar

Is there a passive chip that can do this?

Asked by intro24 (1396 points ) February 28th, 2012 from iPhone

I’m trying to think of a technology that would allow me to communicate with a passive object (that is, doesn’t use electricity) no more than a meter away. I was thinking RFID or NFC but I don’t know enough about the two to say for sure. Any suggestions? Specifically I need to find a way to track a thin, passive device less than a meter from a powered device. Just so I know the position of the passive device relative to the powered one.

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3 Answers

XOIIO's avatar

Yes, it’s passive RFID tech. The range depends on the chip, some small ones you swipe right beside a usb reader, expensive ones work from several inches.

talljasperman's avatar

Yes… people steal credit card chip info up to 40 feet with that tech all the time.

dabbler's avatar

Most descriptions of NFC I see are not passive the way the RFID tech is. The ‘remote’ device will be powered and it has some smarts in it like a phone or tablet, and it will have some protocols that it will notice and respond to. They be able to communicate both ways and handle a lot more information than and RFID.

An RFID rig can typically only send from the ‘remote’ to a surveying host a small amount of information usually a unique identifier. There isn’t any real info transfer from host to remote except a signal that has the right characteristics (and enough power) to trigger the response.

NFC has a big security advantage because the powered smarts can do enough processing so it can refuse to respond unless given the right security handshakes.

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