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  • Re: Ada libraries to deal with RFID tags

    From Saada Mehdi@21:1/5 to All on Fri Dec 23 09:00:02 2022
    I answer my own question: dunno for that specific range of frequencies, but yes we can use Arduino plateforms to build a reader, and Ada can program Arduino. So it's just a matter of writing it seems.
    But I think I haven't found the right tech though, for a positive ping isn't enough, I'll need to pin-point to the nearest ten of centimeter. If anyone has an educated guess, I'm all ears.

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  • From Saada Mehdi@21:1/5 to All on Fri Dec 23 08:41:21 2022
    Hi,
    In the future I'll be working with RFID tags, mostly on the short range (1–100 m) 433 MHz kind, defined by part 7 of the standard (https://www.iso.org/standard/57336.html). At least that should fit my needs.
    I'll track mice or such small animals (no insects though) left free in an enclosed area, so that they feed themselves on the ground.
    I read those chips were cheap, 5$.
    Are there Ada libraries to deal with these kinds of devices ? I mean, to build RFID readers. Ideally I would need to map the mice' locations and movements and tell apart specific individuals.

    Thanks,
    Mehdi

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  • From Saada Mehdi@21:1/5 to All on Fri Dec 23 09:23:30 2022
    3 reading receiving towers should be able to triangulate/pin-point passive RFID chips at any given time.

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  • From Saada Mehdi@21:1/5 to All on Fri Dec 23 10:53:31 2022
    Yes I realized I was (way ?) over my head here, there are a lot of issues to consider. Well, lot of reading ahead of me.

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  • From Niklas Holsti@21:1/5 to Saada Mehdi on Fri Dec 23 20:38:42 2022
    On 2022-12-23 19:23, Saada Mehdi wrote:
    3 reading receiving towers should be able to triangulate/pin-point
    passive RFID chips at any given time.


    You wanted 10 cm precision, right? If you use time-of-flight to compute
    the position, this requires about 0.3 ns timing precision and
    synchronization, if each Tx/Rx tower times its own sending and
    reception. You could get around the synch problem by cabling the Tx/Rx
    signals from and to a central Tx/Rx, but you still have to be able to
    measure the time differences between the three Rx signals to that
    precision. I doubt if that can be done with standard RFID Tx/Rx electronics.

    Some discussion, negative and positive, here (part of the result of a
    web search for "RFID triangulation"):

    https://www.quora.com/Can-the-position-of-a-RFID-tag-be-tracked-with-high-precision-in-a-2D-or-3D-space?share=1

    There are some references to fancier electronics that can provide good
    spatial resolution.

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  • From =?UTF-8?Q?Bj=c3=b6rn_Lundin?=@21:1/5 to Saada Mehdi on Tue Dec 27 13:13:11 2022
    On 2022-12-23 18:00, Saada Mehdi wrote:
    I answer my own question: dunno for that specific range of frequencies, but yes we can use Arduino plateforms to build a reader, and Ada can program Arduino. So it's just a matter of writing it seems.
    But I think I haven't found the right tech though, for a positive ping isn't enough, I'll need to pin-point to the nearest ten of centimeter. If anyone has an educated guess, I'm all ears.



    I would use UWB


    example of ready-to-use system <https://www.bitcraze.io/documentation/system/positioning/>

    Look at the loco-positioninging

    I is somewhat close to your case, this tracks small in-door drones in
    realtime, and handles swarms as well.



    --
    /Björn

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