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Thread: Video output from DashDaq

  1. #1
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    Video output from DashDaq

    Ok, I am not an electronics engineer so I may not be forming my questions correctly. In fact I am not even sure what the correct questions should be. So I am just going to explain what I have and what I am trying to do with it and hopefully someone here can help me to understand what is required to accomplish the goal.

    What I have is a DashDaq XL (http://www.dashdaq.com/). It is a CAN bus monitoring device which allows the user to create custom gauge and graph screens to be generated (in real time) from vehicle/power train telemetry information available on the CAN bus via the OBDII port. The device has a smallish 4” touch screen which displays the gauges/graphs and allows user input.

    The problem I have with the device is that it's display is (as I say) somewhat small and there is no way to mount the unit where it would be inconspicuous yet still in the drivers natural field of view. To solve this problem I would like to output the video from the device and display it on my in dash nav screen. Displaying on the nav screen is not a problem…the problem comes in trying to get a video output from the device. I do not need for the secondary display (the nav screen) to retain the touch control of the device’s display, all I need is to somehow tap into the video of the DashDaq and output it as a simple composite (RCA) video signal.

    I know that the DashDaq is just a Linux PC on a board running custom CAN software. I also know, form disassembling the unit that the display used is this one http://www.allparts.co.kr/files/lcd/...4_20070827.pdf.
    So can anyone here help me get a standard composite video signal out of this device?

    Thanks,
    Steve

  2. #2
    North of the land of Hey Huns
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    I'd say look and see if the internal PC has some kind of vga/hdmi output. That's liable to be your best bet if you can get into the internals of the linux pc itself. All in all, those type of devices are very limited in what you can do outside of their specifications, and doing so voids the warranty and risks breaking the device.

    IMO, those devices are completely pointless. Just install gauge software on your carpc, buy an ELM327 based device and presto, gauges on as large of a screen as you would like.
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
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  3. #3
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    Quote Originally Posted by malcom2073 View Post
    I'd say look and see if the internal PC has some kind of vga/hdmi output. That's liable to be your best bet if you can get into the internals of the linux pc itself. All in all, those type of devices are very limited in what you can do outside of their specifications, and doing so voids the warranty and risks breaking the device.

    IMO, those devices are completely pointless. Just install gauge software on your carpc, buy an ELM327 based device and presto, gauges on as large of a screen as you would like.
    Thanks for the response.

    I have actually already disassembled the DashDaq and looked at the "PC on a board" the problem is that it does not have (at least that I can find) any video output other than the connector for the FFC of the attached display. What I am looking for is some type of device that can convert the video signals available within that connector (see the displays datasheet linked to in my original post) to standard composite video.

    As to the warranty, as mentioned, I already opened the thing up and thus voided the warranty so that is, at this point, a complete non-issue.

    I do not have (nor do I plan to add) a carpc so creating my own CAN monitor system is not an option.

    Steve

  4. #4
    North of the land of Hey Huns
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    Ah, well you might be better served by posting this on their forums. This is a carpc website, so most of what you will find here will be carpc related. As I had mentioned, carpc's make the dashdaq fairly redundant so there isn't much point (in the context of this website) for disassembling one or using it. The dashdaq forums, while they likely do not support such an endevour, might contain some people who are more familiar with the device and possibly have done similar things to what you are doing. (http://www.dashdaq.com/forum/). I would hate to see you wait around on here, while your question could likely much better be answered in a place more centered around your device.
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
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  5. #5
    Maximum Bitrate tft_lcd_org's Avatar
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    The LCD in your Dashdaq is a TTL level panel, and the PC does not provide a composite output. Only the TTL driver for the 480x272 resolution panel + touch.

    There is no way to make the DD work with an OEM Nav.

    What you would need to do is find an LCD controller board that will accept TTL IN, and Output to AV (FYI, I have NEVER seen one, and I doubt they exist).

    Basically what I am trying to say is you cannot due what you want to do with that device.

    Sorry.

  6. #6
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    Quote Originally Posted by tft_lcd_org View Post
    The LCD in your Dashdaq is a TTL level panel, and the PC does not provide a composite output. Only the TTL driver for the 480x272 resolution panel + touch.

    There is no way to make the DD work with an OEM Nav.

    What you would need to do is find an LCD controller board that will accept TTL IN, and Output to AV (FYI, I have NEVER seen one, and I doubt they exist).

    Basically what I am trying to say is you cannot due what you want to do with that device.

    Sorry.
    Thanks for the input. As is probably obvious by now, I know next to nothing about this stuff but would really like to find a solution.

    Using your suggestion I googled "TTL to composite video converter" and found this...

    http://www.datasheetcatalog.org/data.../314896_DS.pdf

    Would this work?

    Thanks,
    Steve

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