Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 38

Thread: Pic + software based digital dash

  1. #11
    Raw Wave shotgunefx's Avatar
    Join Date
    Apr 2005
    Location
    Boston, MA
    Posts
    1,800
    Quote Originally Posted by lez
    ECU's - Dont have any in my car!

    Differential wheel speed wont work, unless you have a cray, as tyre ware will give much more difference than pressure, and what about cornering?


    I would love to have tyre pressure, but cant think of anyway to do it except rf.
    Many factory systems do exactly this. If a tire is low, it spins faster than the rest. There must be some averaging to account for cornering. Though if all the tires lose air at the same speed, it won't catch it.

    There's a previous thread here.

  2. #12
    Raw Wave lostreception's Avatar
    Join Date
    Sep 2004
    Location
    NY
    Posts
    1,806
    lez what type of cardo you have and im assuming this will be OBD-II

    not OBD-I which will never be implemented like i want it to be
    .______
    | '_ |__\___
    [(o)|___(o)] XB
    ._________
    | I__I I_I|_\__I
    [(o)______(o)]b VanPimpin'

    LostReceptions Apps D/L Here

    GPSGasoline- Rewriting

    Draw- SkribblePad for Touchscreens

    iGQwerty-iG3.0 Qwerty Keyboard

    CarPCNetwork

  3. #13
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
    Join Date
    Oct 2004
    Location
    NY
    Posts
    6,234
    what factory cars sense tire pressure through wheel speed, I don't see how that's possible.....there are way to many variables for this to ever be reliable....

    all systems I have ever seen use a transmiting sensor in the wheel.... this isn't a huge expense for the manufactures & is reliable & acurate.... I can't see this being done by wheel speed alone, correct me by telling me which car does that... as I could be wrong

  4. #14
    Constant Bitrate
    Join Date
    Jul 2004
    Posts
    127
    Quote Originally Posted by turbocad6
    what factory cars sense tire pressure through wheel speed, I don't see how that's possible.....there are way to many variables for this to ever be reliable....

    all systems I have ever seen use a transmiting sensor in the wheel.... this isn't a huge expense for the manufactures & is reliable & acurate.... I can't see this being done by wheel speed alone, correct me by telling me which car does that... as I could be wrong
    Car manufactures use the ABS sensor to determine the rotations of the tire. This is how the tire pressure is calculated. Goes by the numbe of rotations in seconds.
    2003 Black Impala

  5. #15
    Raw Wave shotgunefx's Avatar
    Join Date
    Apr 2005
    Location
    Boston, MA
    Posts
    1,800
    Quote Originally Posted by turbocad6
    what factory cars sense tire pressure through wheel speed, I don't see how that's possible.....there are way to many variables for this to ever be reliable....

    all systems I have ever seen use a transmiting sensor in the wheel.... this isn't a huge expense for the manufactures & is reliable & acurate.... I can't see this being done by wheel speed alone, correct me by telling me which car does that... as I could be wrong
    I don't know if there are that many more variables to account for than there are with direct monitoring. Pressure is going to vary on cornering too.

    Try googling "indirect tire pressure monitoring" for lot's of info. I have a really good pdf on it somewhere but can't locate it at the moment.

  6. #16
    Raw Wave shotgunefx's Avatar
    Join Date
    Apr 2005
    Location
    Boston, MA
    Posts
    1,800
    Here are some cars that us indirect tpms.

    vehicles that currently have indirect ABS-based TPMS include 2001 to 2003 Ford Windstar, 1997-2002 Buick Park Avenue, 1999-2003 Buick Century & Regal, 2002-2003 Buick LeSabre, 2003 Buick Rendezvous & Aztek, 2000-2003 Chevy Impala & Monte Carlo, 1999-2002 Chevy Alero, 1999-2002 Pontiac Grand Am, 1997 - 2003 Pontiac Grand Prix, 2000 - 2003 Pontiac Bonneville, and 2001-2003 Oldsmobile Aurora.

    There's also an overview here

  7. #17
    Raw Wave RoyN's Avatar
    Join Date
    Sep 2004
    Location
    São Paulo, Brazil
    Posts
    3,534
    @lostreception:

    Quote Originally Posted by lez
    ECU's - Dont have any in my car!
    therefore, not OBD, he will be using, from my understanding, direct sensors...
    Roy

    2005 Range Rover 4.4
    Any ideas for putting a PC in this? :)

  8. #18
    Raw Wave lostreception's Avatar
    Join Date
    Sep 2004
    Location
    NY
    Posts
    1,806
    Quote Originally Posted by RoyN
    @lostreception:



    therefore, not OBD, he will be using, from my understanding, direct sensors...
    .______
    | '_ |__\___
    [(o)|___(o)] XB
    ._________
    | I__I I_I|_\__I
    [(o)______(o)]b VanPimpin'

    LostReceptions Apps D/L Here

    GPSGasoline- Rewriting

    Draw- SkribblePad for Touchscreens

    iGQwerty-iG3.0 Qwerty Keyboard

    CarPCNetwork

  9. #19
    lez
    lez is offline
    FLAC lez's Avatar
    Join Date
    Jan 2004
    Location
    UK
    Posts
    1,334
    Direct sensors, no ob-1-kenobi anything.

    Tyre pressure on wheel speed: I am a non believer....

    Still looking for a nice way to get oil pressure sensor for 150psi and air for 0-30/40 psi

    Have seen some oil sensors that are electronic but the cost of one of them is about the cost of this setup opn its own.

    If I cant do all this for $75 or less I'm not doing it right......

  10. #20
    lez
    lez is offline
    FLAC lez's Avatar
    Join Date
    Jan 2004
    Location
    UK
    Posts
    1,334
    Quote Originally Posted by shotgunefx
    Here are some cars that us indirect tpms.

    <list>.

    There's also an overview here
    And they are ll crap because...(qutoe)

    But on most applications, a tire has to loose anywhere from 8 to 14 pounds of air pressure before there's enough of a difference in diameter to be detected by the wheel speed sensors

    (end quote)

    thats crap.

    I can tell just from the feel of my vehicle when driving if I am down by about 5lb, so if you need a machine to tell you why your car is flopping around corners like a dead fish, you should not be driving the car, or having a pc in it as you obviously dont need the distraction of music playing...(you may not know the engine is on..)

    This is not aimed at anyone on the group, but if you need to know its 8-14lb down.....

    obviously a system dreamed up not to actually work effectively, but just to satisfy laws etc.

Page 2 of 4 FirstFirst 1234 LastLast

Similar Threads

  1. 2003 BMW M3 Custom Dash / Overhead Console
    By gork in forum Show off your project
    Replies: 373
    Last Post: 01-01-2008, 07:52 PM
  2. Software based tivo like function for radio
    By PURDooM in forum Input Devices
    Replies: 1
    Last Post: 06-26-2005, 04:22 PM
  3. Software solution for gLCD-based car-mp3
    By Novgorod in forum Software & Software Development
    Replies: 1
    Last Post: 07-01-2004, 07:59 PM
  4. A different digital dash.
    By MP3DUB in forum General Hardware Discussion
    Replies: 0
    Last Post: 04-05-2002, 09:55 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •