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Thread: My home-brew Arduino OBD-II connection kit

  1. #11
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    The problem is I am not using a car PC but the stock RNS510 which is a close system. I doubt if it supports custom data display of any kind.
    How do you grab data from can bus with Arduino? Use MCP2551 and MCP2515?

    Quote Originally Posted by that_kid View Post
    Yes it's possible. There are a couple of youtube videos which show some setups but not much on how it's done. There's a lot you can do with canbus. I was able to use my arduino canbus setup to grab steering wheel button presses and send them to the carpc. I also use canbus to tell the carpc when the key is in the ignition and also when the car is in reverse. That's just scratching the surface, there's so much more that can be done.

  2. #12
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    Oh OK, yeah I don't think you can modify the 510 to send extra data. Maybe with vagcom perhaps but I don't know. I totally pulled my RNS2 from the car since the carpc replaced it. Yes with the arduino I'm using mcp2215/2251's. I originally brought a spark fun CANBUS shield then after looking at the schematic I built another one without the GPS, LCD and joystick to connect with my teensyduino.

  3. #13
    Maximum Bitrate Borte's Avatar
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    Quote Originally Posted by stanleyhuang View Post
    The problem is I am not using a car PC but the stock RNS510 which is a close system. I doubt if it supports custom data display of any kind.
    How do you grab data from can bus with Arduino? Use MCP2551 and MCP2515?
    Can't you just place a Arduino in between the RNS and your dash? It can pass the CAN data from the RNS to the dash as well as generate new specific messages from the Arduino.
    Failure is not an option...
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  4. #14
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    You can do that, all you need is 2 CANBUS devices. One to receive/transmit to the RNS and another to receive/transmit to the infotainment/convience bus. Then program the arduino to move msgs back and forth across them. There's a company who has boost and other information that they show on the MFD and that's exactly how they do it. I've found that you don't have to register on the bus to send info if you are mimicking something already on the bus...say the RNS. It comes down to what you want to put in the display and from where.

  5. #15
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    As far as I have seen, RNS does not display any vehicle data like RPM or coolant temperatures. That means the software running on it is not progammed to display those data. Even if I hack into the can bus, without replacing or injecting software in RNS, how will it display the data I want it to display?

  6. #16
    Maximum Bitrate Borte's Avatar
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    You send the characters and the graphics you want do display directly. It doesn't have built in graphics, it shows the dynamic graphics coming in over the CAN bus.
    Failure is not an option...
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  7. #17
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    I don't believe rns receives graphic data from can bus and show them on the screen, cause the data flow for real time graphics is much too high for can bus bandwidth.

    Quote Originally Posted by Borte View Post
    You send the characters and the graphics you want do display directly. It doesn't have built in graphics, it shows the dynamic graphics coming in over the CAN bus.

  8. #18
    Constant Bitrate cazzz's Avatar
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    Quote Originally Posted by stanleyhuang View Post
    Hi Borte, I am glad you like my work.
    I drive a Volkswagen Scirocco 1.4TSI. Yes I use my OBD-II kit to pull data out from OBD/CAN.
    I drive a 2004 Jetta GLI and I have been looking for a way to pull boost from the CAN bus.

    I am interested in your kit. Can you display boost using your components?
    Last edited by cazzz; 05-31-2012 at 07:05 PM.

  9. #19
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    Do you have a version of this that uses the newer/better STN1110 ?

    Would love to have one of these that is set to plug into a board... I don't need the actual connector since I plan to splice mine into the line to allow the connector to stay in place. Since the dash cluster uses ODB II I may just tie into the dash feed and not need the normal connector at all.

    The STN1110 has a much faster refresh rate and is supposed to be much more compatible than the ELM327 chip.

    Rodney

  10. #20
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    The boost value cannot be retrieved directly unless you know which PID can be used to retrieve it with.
    However the boost value can be calculated and estimated indirectly from values of barometric pressure and intake pressure.

    Quote Originally Posted by cazzz View Post
    I drive a 2004 Jetta GLI and I have been looking for a way to pull boost from the CAN bus.

    I am interested in your kit. Can you display boost using your components?

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