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Reading Wireless Air Transmitter using Arduino

Discussion in 'Do It Yourself - DIY' started by Nickorossa, Oct 18, 2020.

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  1. Nickorossa

    Nickorossa Angel Fish

    # of Dives: 0 - 24
    Location: UK
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    Hi
    Has anyone managed to successfully read wireless air pressure transmitters using an arduino (or similar) and a suitable receiver? I did do a bit of searching, but couldn't find anything.
    Thanks.
    Nick.
     
    Nickorossa, Oct 18, 2020
    Nickorossa, Oct 18, 2020
    #1
  2. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    I don't think anyone has even reported hearing the signal, much less decoding it.
     
    tursiops, Oct 18, 2020
    tursiops, Oct 18, 2020
    #2
  3. broncobowsher

    broncobowsher Solo Diver

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    That would be a neat project. Even if it ended up just being a bench project. Turn the bottles on, look at a bench display, know they are transmitting and what pressure is inside. Or more important, you left them pressurized and are running down the batteries in the transmitters.
     
    broncobowsher, Oct 18, 2020
    broncobowsher, Oct 18, 2020
    #3
  4. Kohanbash

    Kohanbash Solo Diver

    # of Dives: 200 - 499
    Location: PA, USA
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    Is the protocol open? Does anyone have documentation for it?

    What’s the frequency?
     
    Kohanbash, Oct 18, 2020
    Kohanbash, Oct 18, 2020
    #4
  5. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    38kHz
     
    tursiops, Oct 18, 2020
    tursiops, Oct 18, 2020
    #5
    Kohanbash likes this.
  7. Nickorossa

    Nickorossa Angel Fish

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    Even finding that information seems difficult.

    Mares don't seem to provide it in their manuals and product specs.

    Suunto reference 5.3KHz in their d6i tech specs.

    Shearwater and compatibles use the 38KHz mentioned above.

    As for documentation on protocols and transmission details, I haven't found anything yet.

    Nick.
     
    Nickorossa, Oct 19, 2020
    Nickorossa, Oct 19, 2020
    #6
  8. jensfisc

    jensfisc Angel Fish

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    You could try something like a proxmark3 and figure out how to downscale the receiving frequency into the transmitters frequency. Those are very good for black box protocol testing and reversing.
     
    jensfisc, Oct 19, 2020
    jensfisc, Oct 19, 2020
    #7
  9. dm9876

    dm9876 Angel Fish

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    cool project idea. these things will all work in the LF / VLF near feild which is how they can work underwater. you'll need apropriate reciever coil. the mention of 5.3khz suggests it could be related to the old school heartrate monitors which operate at that frequency and on the same principles. Not sure about the 38khz ones. Some other thread talks a bit about it seems to be a widely used transmitter by OEM Pelagic Pressure Systems

    Air Integration

    this article talks more about the heart rate monitors, but gives you some idea how you might go about building a reciever front end for such a project

    RMCM01 is a Heart rate monitor for Polar chest belts.

    of course you would still then need to reverse engineer the protocol itself.

    Dean
     
    dm9876, Oct 23, 2020
    dm9876, Oct 23, 2020
    #8
  10. Cio

    Cio Angel Fish

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    If someone has a dead one, opening it up and looking at the chip would be the best start.
     
    Cio, Oct 31, 2020
    Cio, Oct 31, 2020
    #9
  11. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    What would you be looking for on the chip? We already know the transmission frequency....
     
    tursiops, Oct 31, 2020
    tursiops, Oct 31, 2020
    #10
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