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Thread: Custom USB tyre pressure monitoring interface

  1. #1011
    FLAC WuNgUn's Avatar
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    Which reminds me...

    Today I went about 'learning' my sensors, seeing that I have all 4 working now...
    But I'm a little confused, as I rotated my tires (front to back) before I learned them. The colour marking is swapped front/rear now.
    The problem is, I learned the sensors matched to the colour coding, so using RRTMS, the rear left and right are number 1 and number 2...Front is 3 and 4...

    No problem learning them like this, HOWEVER, when setting up sensor assignments in Centrafuse, should I select the numbers the same as RRTMS, i.e. front left/right = 3/4, etc., or should the assignments stay the same, 1 thru 4?

    In other words, is CF reading the data as it's learned from RRTMS, or is it assuming front left is always 1, front right 2, etc.?

    I think I have the CF plugin really confused...or I'm really confused!
    I have to mess with the PSI to find out whats really going on...

    Or just 'learn' it regardless of colour coding, and simply learn them in the proper order, 1, 2, 3, 4... (and swap the colour rings around!)

  2. #1012
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    Quote Originally Posted by WuNgUn View Post

    I think I have the CF plugin really confused...or I'm really confused!
    I have to mess with the PSI to find out whats really going on...

    Dunno about the CF plugin or you, but I's cerrtainly confused.


    Which is really worrying considering my Custom Title.

  3. #1013
    Lok
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    Quote Originally Posted by WuNgUn View Post
    should I select the numbers the same as RRTMS, i.e. front left/right = 3/4, etc., or should the assignments stay the same, 1 thru 4?

    In other words, is CF reading the data as it's learned from RRTMS, or is it assuming front left is always 1, front right 2, etc.?

    I think I have the CF plugin really confused...or I'm really confused!
    I have to mess with the PSI to find out whats really going on...

    Or just 'learn' it regardless of colour coding, and simply learn them in the proper order, 1, 2, 3, 4... (and swap the colour rings around!)
    Regardless of what program you use to learn the sensors you writing ID's to the recievers internal memory, so the first time you learned the sensors I would assume that 1-FL 2-FR 3-RR 4-RL 5-S. Now that you have rotated your tires (Lets assume you used the traditional rotation patter for rear/4 wheel drive cars as you have a Durango, use this site as reference http://www.tirerack.com/tires/tirete...jsp?techid=43& Pattern C) your order should now have changed to 1-RR 2-RL 3-FR 4-FL 5-S. There is no way for the reciever to know where your sensors are...yet .

  4. #1014
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by Lok View Post
    Regardless of what program you use to learn the sensors you writing ID's to the recievers internal memory, so the first time you learned the sensors I would assume that 1-FL 2-FR 3-RR 4-RL 5-S. Now that you have rotated your tires (Lets assume you used the traditional rotation patter for rear/4 wheel drive cars as you have a Durango, use this site as reference http://www.tirerack.com/tires/tirete...jsp?techid=43& Pattern C) your order should now have changed to 1-RR 2-RL 3-FR 4-FL 5-S. There is no way for the reciever to know where your sensors are...yet .
    LMFAO...... I have a Durango silly, and I have the 2 Wheel Drive one, couldnt find a decent 03 4x4 in the year 2007 when I bought the car.... WuNgUn has a Ford Focus......
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  5. #1015
    FLAC WuNgUn's Avatar
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    Okay...I'll relearn them using RRTMS using the standard 1-FL 2-FR 3-RR 4-RL pattern...
    Then use CF to configure where the tires are...
    My tires are directional, so they only move forwards and backwards when rotated, not X cross

  6. #1016
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    anyone know where i can get a pre-etched bread board and a programmed pic chip? i am going to hook up this receiver http://www.sparkfun.com/commerce/pro...oducts_id=8947

    going to see if i can pick up my sensors to start getting samples of packets so we might be able to decode them. the hope being maybe we can expand this for use with cars that already have sensors

  7. #1017
    FLAC WuNgUn's Avatar
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    Okay...reprogramed the sensors again today, this time without altering the locations.
    Reprogramed easy, thanks to the new hardware!

    Everything seems to be working well...

    However, I have the reciever mounted in the dash behind the monitor, and I'm not sure if it's picking up the sensors. The data seems to never change!
    (I programed it with the reciever on the dash, so I can 'reboot' it after each 'learn')

    Is there a way to know if it's reading 'new' data, or just displaying the 'learned' data?

    Perhaps this could be a future feature...to have the TPMS tell you if it hasn't recieved any new data after X amount of minutes?

  8. #1018
    Lok
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    Quote Originally Posted by WuNgUn View Post
    Okay...reprogramed the sensors again today, this time without altering the locations.
    Reprogramed easy, thanks to the new hardware!

    Everything seems to be working well...

    However, I have the reciever mounted in the dash behind the monitor, and I'm not sure if it's picking up the sensors. The data seems to never change!
    (I programed it with the reciever on the dash, so I can 'reboot' it after each 'learn')

    Is there a way to know if it's reading 'new' data, or just displaying the 'learned' data?

    Perhaps this could be a future feature...to have the TPMS tell you if it hasn't recieved any new data after X amount of minutes?
    Do you have the LED version of the board??? If so then there are two LED's on the device, one should remain on once the USB link has been established and the other should blink every time you recieve a new packet.

  9. #1019
    Lok
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    Quote Originally Posted by Xargon321 View Post
    anyone know where i can get a pre-etched bread board and a programmed pic chip? i am going to hook up this receiver http://www.sparkfun.com/commerce/pro...oducts_id=8947

    going to see if i can pick up my sensors to start getting samples of packets so we might be able to decode them. the hope being maybe we can expand this for use with cars that already have sensors
    I would talk to the forum member Dejan about that. I don't think he has been selling them much since the new USB TPMS came out but he may still have a pic chip and a board laying around. Also just so you know the PIC chip is protected so you won't be able to read the firmware. I am interested to see where you go with this development as I have had many people ask me if their TPMS will work with stock systems. Be sure and e-mail me if you need help, I might be able to give you some pointers.

  10. #1020
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    Quote Originally Posted by Xargon321 View Post
    anyone know where i can get a pre-etched bread board and a programmed pic chip? i am going to hook up this receiver http://www.sparkfun.com/commerce/pro...oducts_id=8947

    going to see if i can pick up my sensors to start getting samples of packets so we might be able to decode them. the hope being maybe we can expand this for use with cars that already have sensors
    I don't think you should waste any time on a pre-programmed chip just follow the links on the sparkfun product page to get it hooked up via serial and start reverse engineering the protocol. There is no reason we shouldn't have a receiver for < $50 and the whole system for < $150.

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