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Thread: Custom USB tyre pressure monitoring interface

  1. #651
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    Quote Originally Posted by Robby BMW View Post
    Glad to hear this, but are you sure about the formula to get the pressure?
    2.38 is a strange value.

    As for the signal strength, I had initially thought to it, but since the data packet sent from the sensors is too fast (about 11,2 ms) there isn't sufficient time to perform a reliable reading, also it would be necessary to modify the 3rdEye receiver to pickup the signal strength (i think it is available on the pin 26 of the TDA5200) and make an A/D conversion of this last.
    Not sure about 2.38 .... I calculated based on my values... it may be also measurement error.

  2. #652
    Newbie wiggy's Avatar
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    Quote Originally Posted by Robby BMW View Post
    Ok, try this:
    Do a master reset to the PIC with TPMS DOCTOR, then perform the learnig procedure trough RRTMS Config taking care to place the receiver at least 1 meter from the tyres and to wait at least 1minute between a tire and the other.
    Help !!! still no joy.

    I cleared the pic ..and opened RRTMS.

    Paired the first wheel .Waited 2 mins ..pressed learn on the second wheel and after 6 seconds it stops flashing.This is with out me doing anything ..just walking to the tyre.

    Same with 3 and 4 ..it just pairs automatically.

    All 4 wheels then read the same pressure...and if i adjust any of the pressures ..nothing changes.

    I have tryed it with the usb board out of the plastic box ..no difference.

    I have tryed with a different pc (laptop) does exactly the same.

    Tryed resetting pic and pairing with centrafuse ...it sometimes paires ..but again second one pairs automatically.

    All 5 sensors were the same numbers , but with a white square with 1-5 at the end .

    The other set of wheels fitted with sensors have 4 completly different numbers .

    Have tryed pairing with those aswell , but same as above.

    Any idea's ...i have spent over $350 on this and it was supposed to be tested before i got it .

  3. #653
    Maximum Bitrate Robby BMW's Avatar
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    Quote Originally Posted by wiggy View Post
    Help !!! still no joy.

    I cleared the pic ..and opened RRTMS.

    Paired the first wheel .Waited 2 mins ..pressed learn on the second wheel and after 6 seconds it stops flashing.This is with out me doing anything ..just walking to the tyre.

    Same with 3 and 4 ..it just pairs automatically.

    All 4 wheels then read the same pressure...and if i adjust any of the pressures ..nothing changes.

    I have tryed it with the usb board out of the plastic box ..no difference.

    I have tryed with a different pc (laptop) does exactly the same.

    Tryed resetting pic and pairing with centrafuse ...it sometimes paires ..but again second one pairs automatically.

    All 5 sensors were the same numbers , but with a white square with 1-5 at the end .

    The other set of wheels fitted with sensors have 4 completly different numbers .

    Have tryed pairing with those aswell , but same as above.

    Any idea's ...i have spent over $350 on this and it was supposed to be tested before i got it .
    You have a new PM
    _______________________________________
    Car installation 95% [■■■■■■■■■■■■■■■■■■■]
    Current project: Parking sensor USB interface

  4. #654
    Constant Bitrate goosey2099's Avatar
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    Quote Originally Posted by wiggy View Post
    Help !!! still no joy.

    I cleared the pic ..and opened RRTMS.

    Paired the first wheel .Waited 2 mins ..pressed learn on the second wheel and after 6 seconds it stops flashing.This is with out me doing anything ..just walking to the tyre.

    Same with 3 and 4 ..it just pairs automatically.

    All 4 wheels then read the same pressure...and if i adjust any of the pressures ..nothing changes.

    I have tryed it with the usb board out of the plastic box ..no difference.

    I have tryed with a different pc (laptop) does exactly the same.

    Tryed resetting pic and pairing with centrafuse ...it sometimes paires ..but again second one pairs automatically.

    All 5 sensors were the same numbers , but with a white square with 1-5 at the end .

    The other set of wheels fitted with sensors have 4 completly different numbers .

    Have tryed pairing with those aswell , but same as above.

    Any idea's ...i have spent over $350 on this and it was supposed to be tested before i got it .
    i have the same issue.

  5. #655
    Variable Bitrate
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    May 2006
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    Belgium
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    261
    Quote Originally Posted by wiggy View Post
    Help !!! still no joy.

    I cleared the pic ..and opened RRTMS.

    Paired the first wheel .Waited 2 mins ..pressed learn on the second wheel and after 6 seconds it stops flashing.This is with out me doing anything ..just walking to the tyre.

    Same with 3 and 4 ..it just pairs automatically.

    All 4 wheels then read the same pressure...and if i adjust any of the pressures ..nothing changes.

    I have tryed it with the usb board out of the plastic box ..no difference.

    I have tryed with a different pc (laptop) does exactly the same.

    Tryed resetting pic and pairing with centrafuse ...it sometimes paires ..but again second one pairs automatically.

    All 5 sensors were the same numbers , but with a white square with 1-5 at the end .

    The other set of wheels fitted with sensors have 4 completly different numbers .

    Have tryed pairing with those aswell , but same as above.

    Any idea's ...i have spent over $350 on this and it was supposed to be tested before i got it .
    same problem here...

    Greetz

    Dj NRG

  6. #656
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    _Dejan_'s Avatar
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    This is strange
    Guys are you receive boards from me?

  7. #657
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    Quote Originally Posted by _Dejan_ View Post
    This is strange
    Guys are you receive boards from me?
    nope, my board comes from LYHTSPD

  8. #658
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    Feb 2006
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    Melbourne, Australia
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    Hey DeJan,
    I have the same issue with the last board from you.

    All the other ones was fine, but somehow the last board has the same issue, pairing one wheel (if I'm lucky) and the others don't pair, just stop flashing after few seconds without me deflating the assossiated tyre.

    This was on a unit I made for someone, but not cutting the rx of the original unit, just feeding the signal from the 3rd pin on the connector.

    It's not the cable, on another unit it worked fine.

    So, something amiss with some of these units, maybe tolerances...dunno.

    Robby, any idea?
    F6 Tornado Project Log ; HP Blackbird Watercooled Server

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

  9. #659
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    Jul 2006
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    Wiggy, I did test all of the usb interfaces before I sent them out. I made sure that all sensors could pair with the device, and then did a Master Reset to clear out the sensor ID (I was not sure which tire would end up where on the final installation).

    I did see this happen every once in a while when pairing the sensors. I started to wonder if there was just too much RF traffic from all the sensors, and the receiver PIC could not handle all of it. At that point I would usually just call it a night and come back to it the next day, and it would not have any problems. *shrug*

    Edit: From what mrBean said, was there any changes in the PIC code Robby?

  10. #660
    Maximum Bitrate Robby BMW's Avatar
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    No, there isn't change in the firmware code.
    However Wiggi will send me his device for a complete checkup. After the inspection, I will inform you all about a possible solution.
    _______________________________________
    Car installation 95% [■■■■■■■■■■■■■■■■■■■]
    Current project: Parking sensor USB interface

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