Warl0k3 comments on License Plate Cameras Will Soon Track Phones, Wearables, Infotainment, and Even Your Pets

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[–] Warl0k3@lemmy.world 30 points 4 months ago* (2 children)

... pet microchips are passive LF RFID tags, they have a readable range of maybe 15cm? Unless they've figured out some way to power them at distance (or they're sticking UHF tags in your dogs, which they arent) without frying the camera and giving everyone cancer, they're inert. What weird marketing hype.

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[–] DrakeAlbrecht@lemmy.world 16 points 4 months ago (1 child)

Industry researchers have managed to create directional antennas that read 125 kHz chips (the kind used in pets) from as far away as one meter. That's most or all of the width of a sidewalk, if the reader is placed at ground level.

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[–] Warl0k3@lemmy.world 16 points 4 months ago* (last edited 4 months ago)

For unimplanted tags of unspecified size sure it's technically possible to do, but I'll let the article summarize why this is blatant marketing hype:

The ideal lab setup often fails miserably once you mount the reader near a gate or machine frame.

It’s worth saying: 1 meter is an ambitious goal for 125kHz. LF systems are intentionally short-range to prevent cross-talk. If you truly need 1-meter coverage, sometimes the real solution isn’t to push more current — it’s to rethink geometry, use multi-coil zones, or explore hybrid systems (LF for identity, HF/UHF for distance).

and then mention that the interference from the dermis vastly reduces the useful range of the tags, and that the article doesn't actually specify what type of tag they're designing for (or if it's using a set orientation...).

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