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Thread: How to work a microOBD?

  1. #1
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    How to work a microOBD?

    Let me prefix this with "I'm not a hardware guy. All you hardware people just sound to me like you're making, like, clicking and animal screeching noises when you start using y'all's long words"

    I want one of these: http://www.scantool.net/scan-tools/m...roobd-200.html
    and I want it attached to one of these: http://www.igep-platform.com/index.p...d=46&Itemid=55
    [and no, tripzero, "gaffer tape" is not the answer I seek]

    Seriously, how do I do that? The igep has an expansion connector, but I do not understand how any of this would actually work. Like, at some point the microOBD has to appear as some kind of serial port in the OS, and I'm totally at a loss as to how to make that happen. Then I'm at a loss as to how to physically connect the whole getup to my car.

    I'd really appreciate any thoughts from wiser and smarter people than I
    Gary (-;
    OBDGPSLogger, for logging OBDII and/or GPS data
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  2. #2
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    The microobd has a UART interface and the igep has a UART1+3/RS232 header (J960). I believe that would show up as a tty in the linooks. I am unclear on more details than that currently. It's something I want to figure out as well...
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  3. #3
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    Well, I'd assumed the UART was the way to go, but I'm completely missing all the in-between parts
    OBDGPSLogger, for logging OBDII and/or GPS data
    OBDSim, an OBDII/ELM327 software simulator
    mp3car forums: obdgpslogger, obdsim

  4. #4
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    I believe that the expansion connector on the igep board has the UART interface.



    The hardware manual says that the expansion connector supports the UART interface. I'd start by examining the expansion connector documentation to see what it says.

    In addition, the J960 on the IGEP board is a serial port interface (it is shown in the picture as the RS232 debug interface). I really don't know much about UART's but I think they are intended to provide chips with a serial interface.

    "A UART (Universal Asynchronous Receiver/Transmitter) is the microchip with programming that controls a computer's interface to its attached serial devices. Specifically, it provides the computer with the RS-232C Data Terminal Equipment ( DTE ) interface so that it can "talk" to and exchange data with modems and other serial devices."

    The J960 is an RS232 interface, so a UART chip like the microOBD should be able to interface with the J960 port. I'd check for something like a socket and cable to connect the two.

    The other suggestion is to talk to ScanTool about what the names of the hardware bits are that connect to both the chip and also to the cable. I suspect you'll need a custom soldered cable hookup to the socket for the ScanTool chip. It may all be quite simple.

    From the igep wikilab:

    "How many UARTs are available?
    OMAP3 has 3 UARTS:
    UART1 --> RS485 on connector J940
    UART2 --> bluetooth
    UART3 --> debug console on connector J960
    All of this UART are also available on other connectors:
    UART1 --> on connector JA41 without DVI transceiver with CMOS 1v8 logic.
    UART1 --> on connector J940 with CMOS 3V3 logic
    UART2 --> on expansion connector J990 without bluetooth feature.
    UART3 --> on connector JA41 without DVI transceiver with CMOS 1v8 logic."

    The Microobd pinouts show things like UART-RX on one pin and UART-TX on another, just as you would expect a serial device to have. I'd paste it here but you can't do tables in vbulletin.

    Ping Vitali and ask him to help out here!
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
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  5. #5
    VENDOR - ScanTool Vitaliy's Avatar
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    Check out the Basic Reference Design schematic:

    http://www.scantool.net/scantool/dow...nce_Design.pdf

    It shows the minimum number of components you need to hook up microOBD 200 to another circuit.

    "UART" is typically understood to mean a serial port without the RS232 transceivers. The waveform looks identical, except that instead of using -10V to represent a "mark", and +10V to represent a "space", it uses 5V (or 3V) for a mark, and 0V for a space.

    After reviewing the IGEP manual, it is apparent that when they say "UART", they include the RS232 transceiver. So you have two options: you can hack the PCB and tap into the "straight" UART lines, or you can add an RS232 transceiver b/w microOBD and IGEP.

    Either way, you would need to design and build an adapter board.

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
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  6. #6
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    I'd been assuming a board would be necessary no matter what, since I need
    1) Something to bolt the db9 connector to so I can actually talk to the car
    2) Something to bolt the microchip socket to so that I can push the microOBD into it

    I heard rumblings of someone actually doing this stuff. Seriously, if y'all are building it, please let me know; I'm open to adding cash to buy the necessary parts. Who knows, if enough of us do it, it might actually be enough to warrant bulk discounts?

    It feels a little bit backward to me that essentially this is just reimplementing the case that goes on an OBDLink [assuming there's some approximation of a microOBD inside]. At what point does this become not worth the effort?

    Really the igepv2 needs more usb ports :-(

    Gary (-;
    OBDGPSLogger, for logging OBDII and/or GPS data
    OBDSim, an OBDII/ELM327 software simulator
    mp3car forums: obdgpslogger, obdsim

  7. #7
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    How about something like this:

    http://www.sparkfun.com/commerce/pro...roducts_id=449

    It should convert the RS232 UART levels on the IGEP board to TTL UART levels for the microOBD.

  8. #8
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    So... by attaching the TX, RX, GND, and VCC of the microOBD to that board, you get a DB9 that is plugged into the igepv2?

    And then, you have to figure a connection from the microOBD to the OBDII cable?
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  9. #9
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    Yes, that is the theory.
    You will need a power supply for VCC and GND, but maybe the IGEP board has power available.

    I am currently using the microOBD connected to a PIC controller. This is a direct connection since they are both at TTL levels and not RS232.

  10. #10
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    What would be completely awesome is to build a special board for the microOBD that connects to one of the expansion connectors of the igepV2 and on the other end has a DB9 for the OBDII cable.

    Is this possible using the J960 connector?
    Attached Images Attached Images  
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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