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Thread: Custom USB tyre pressure monitoring interface

  1. #721
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    Hey Robby,
    Thanx, will test tomorrow!

    Will notify you of the results

    Kind regards,
    MrBean
    F6 Tornado Project Log ; HP Blackbird Watercooled Server

    Beta Tester for Centrafuse and 3dConnexion (No business affiliation with either)

  2. #722
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    I tried to pair my sensors today using the new software (tpms doctor 1.3 and rrtms) but with no success...

    just to be sure i did nothing wrong, here's what i did:

    - closed CF
    - opened tpms doctor and did a master reset (however, is it normal that when i press "master reset" it does not give me a notification that the reset succeeded?)
    - opened rrtms
    - clicked on my front left tire
    - deflated the tire with 0.5 bar
    - waited 30 sec

    nothing happened

    all i could do was press "abort" or wait longer (however i was at a public gasstation and there were other people waiting to check their tires :s )
    so how long does it normally take to detect the tire once it is deflated?
    anything else i did wrong?

    Greetz

    Dj NRG

  3. #723
    Maximum Bitrate Robby BMW's Avatar
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    Quote Originally Posted by Dj-[NRG] View Post
    I tried to pair my sensors today using the new software (tpms doctor 1.3 and rrtms) but with no success...

    just to be sure i did nothing wrong, here's what i did:

    - closed CF
    - opened tpms doctor and did a master reset (however, is it normal that when i press "master reset" it does not give me a notification that the reset succeeded?)
    - opened rrtms
    - clicked on my front left tire
    - deflated the tire with 0.5 bar
    - waited 30 sec

    nothing happened

    all i could do was press "abort" or wait longer (however i was at a public gasstation and there were other people waiting to check their tires :s )
    so how long does it normally take to detect the tire once it is deflated?
    anything else i did wrong?

    Greetz

    Dj NRG
    Normally it take betwen 10 and 40 seconds, depends on how much and how fast you deflate the tire.
    Are you sure it is not just a problem of poor RF reception?
    Where do you have placed the interface with the receiver?
    In my car I had to place the receiver near the windshield, behind the rear-view mirror in order to get a good reception.
    Also an external antenna could be helpful.
    _______________________________________
    Car installation 95% [■■■■■■■■■■■■■■■■■■■]
    Current project: Parking sensor USB interface

  4. #724
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    I will try again with receiver on other places and wait longer when inflating /deflating the tire.

    I'll let you know if it works

    Greetz

    Dj NRG

  5. #725
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    Response Time

    Quote Originally Posted by Robby BMW View Post
    Normally it take betwen 10 and 40 seconds, depends on how much and how fast you deflate the tire.
    Does this mean that it takes a minimum of 10 seconds for the change in pressure to be detected by the TPMS?

    Is this the 3rd Eye kit's limitation? I'm curious since I've seen OEM systems responding much faster.

  6. #726
    Maximum Bitrate bes51659's Avatar
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    When I did the learning yesterday I could keep an eye on the screen at the same time as I releaseed preasure with a tooth-pick.

    My feeling for timing was that it was pretty much instantanious. But then I had the receiver on the floor next to the tire...

    I did not notice any lag. Waiting did not help. If tmps config did not detect the sensor I had to reduce pressure even more.

    btw. Could maybe the size of the tpmsdoctor and the config app be reduced to fit 480x800, please?

  7. #727
    Maximum Bitrate Robby BMW's Avatar
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    Quote Originally Posted by DigitalVampire View Post
    Does this mean that it takes a minimum of 10 seconds for the change in pressure to be detected by the TPMS?

    Is this the 3rd Eye kit's limitation? I'm curious since I've seen OEM systems responding much faster.
    The interface adquires the data in real time, the delay is due to the PC software that does a data request every 10 seconds.
    I have chosen a time of 10 seconds in order to not overload the slowest systems, but it can be easly changed by recompiling the plugin with a different data pooling time.
    _______________________________________
    Car installation 95% [■■■■■■■■■■■■■■■■■■■]
    Current project: Parking sensor USB interface

  8. #728
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    Quote Originally Posted by Robby BMW View Post
    The interface adquires the data in real time, the delay is due to the PC software that does a data request every 10 seconds.
    I have chosen a time of 10 seconds in order to not overload the slowest systems, but it can be easly changed by recompiling the plugin with a different data pooling time.
    Thanks for the explanation Robby...

    It would be great if the polling time is configurable by the end user. A rapid decline is tire pressure should be an important situation to know as fast as possible.

    Or

    Is it feasible to make this interrupt driven rather than 10 second polling? ie, If any parameters (pressure, temperature, battery) change, the interface should send an interrupt to the PC application over USB and then the SW reads the PIC registers to update the values on screen.

    I confess that my awareness of USB protocol is very less and I'm not even sure whether the interrupt mechanism is possible over USB since it is only a differential data bus with no control lines. I'd imagine a soft interrupt mechanism would exist for USB.

  9. #729
    FLAC WuNgUn's Avatar
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    Are you certain your TPMS is even working at all? Maybe it got wrecked during the cutting/soldering?

  10. #730
    Maximum Bitrate Robby BMW's Avatar
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    Quote Originally Posted by DigitalVampire View Post
    Thanks for the explanation Robby...

    It would be great if the polling time is configurable by the end user. A rapid decline is tire pressure should be an important situation to know as fast as possible.

    Or

    Is it feasible to make this interrupt driven rather than 10 second polling? ie, If any parameters (pressure, temperature, battery) change, the interface should send an interrupt to the PC application over USB and then the SW reads the PIC registers to update the values on screen.

    I confess that my awareness of USB protocol is very less and I'm not even sure whether the interrupt mechanism is possible over USB since it is only a differential data bus with no control lines. I'd imagine a soft interrupt mechanism would exist for USB.
    I don't think the interupt way is practicable, but I can certainly make the polling time configurable by the end user.
    I will take it in consideration for the next release.
    _______________________________________
    Car installation 95% [■■■■■■■■■■■■■■■■■■■]
    Current project: Parking sensor USB interface

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