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  • HUD speedometer

    Note; Not sure if it counts as "innovation", but I fail to see which other thread to use.

    My fusion brain has been used to create a HUD speedometer - 3x 1.5" 7-segment LED displays reflecting off my windscreen.

    I'm using 7 output pins for the "ones" display, another 7 for the "tens", and the last two pins turn on a "1" in the last display whenever I go above 100.
    This obviously means that the maximum speed I can display is 199, but my car can't go that fast anyway - and even if the car could go above 199, I think I'd better concentrate on driving rather than looking at pretty lights at such speeds.

    The actual speeds are provided by my GPS receiver (more accurate than if somehow measured by car-mounted sensors) and decoded by my (homemade) car pc front end.






  • #2
    Very cool!

    Have you experimented at all with windscreen films to optimize the reflective part of the HUD? The Mercedes and Lexus models with HUDs have a thin coating on that section of the glass to make the HUD stand out more. Perhaps you could source something similar so it is brighter? Or is it bright enough while driving? It is hard to guess from the images, but looks much better than I anticipated.
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

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    • #3
      This is one very cool project. I'd love to see this stuff being churned out on a mass scale for car PC usage. Imagine Centrafuse showing up between the driver and the windscreen (probably a driving hazard but still very cool)
      2007 Camry Altise In-dash Car PC

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      • #4
        Originally posted by MeeM View Post
        This is one very cool project. I'd love to see this stuff being churned out on a mass scale for car PC usage. Imagine Centrafuse showing up between the driver and the windscreen (probably a driving hazard but still very cool)
        Full colour VGA quality images are not going to happen in the next decade. Dual colour character LCDs (or pattern LCDs) are at the high end of the tech spectrum right now. Miniaturizing that while retaining the light output and increasing density is not feasible today nor in the immediate future. Maybe our children will have that, but we will not while we are still hip and young. Or rather still walking around with our original natural hips...
        Fusion Brain Version 6 Released!
        1.9in x 2.9in -- 47mm x 73mm
        30 Digital Outputs -- Directly drive a relay
        15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
        Buy now in the MP3Car.com Store

        Comment


        • #5
          had the chance to see a member from the forums HUD that was basically the same thing but a purchased bundle with a 5hz bluetooth GPS. Amazing work
          mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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          • #6
            How about posting some how-to's?
            Originally posted by ghettocruzer
            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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            • #7
              Second that. Nicely done.

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              • #8
                What about using a Matrix Orbital? I believe they have some color displays now. Also could be used for more then just Speed.
                Matrix switch and DXFskin

                2009 Smart Car
                Zotec 775 LGA
                65W Quad 8GB ram - 120GB SSD, 500GB hd
                Asusu Xonar Essence
                5 camera, video matrix switch, 2x 2140 Carnetix PSU
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                • #9
                  Nicely done, but why use a whole fusion brain for this? Isn't there some other sort of expander you can use rather than waste up all the outputs
                  2001 Mustang Convertible Worklog
                  Indigo Custom Frontend (Flash/Delphi)
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                  • #10
                    I would definately not call it a waste. You dont have to use every function of every device.
                    Fusion Brain Version 6 Released!
                    1.9in x 2.9in -- 47mm x 73mm
                    30 Digital Outputs -- Directly drive a relay
                    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
                    Buy now in the MP3Car.com Store

                    Comment


                    • #11
                      Very cool job !

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                      • #12
                        2k1Toaster, windscreen film: I haven't considered putting some sort of film on the screen, but it sounds like an idea. Will consider it. Might be illegal here, though.
                        Bugbyte: how-to: It seems like many of you are interested in this project, so sure, I can write a guide.
                        MeeM, piglith: I am not sure if a standard LCD/VFD display would be bright enough in broad daylight, but on a cloudy day or at night, both would be usable. Maybe a standard TFT monitor with brightness on full could be used for a large HUD? Do go ahead and test it!
                        Colin: The very cheapest way to do this would probably be to get two USB-to-parallel converters, add some led drivers and then connect the displays. However, it would be somewhat bulky and require quite a bit of soldering and fiddling, and remind me too much of http://www.afrotechmods.com/ , so I chose a Fusion Brain. I do agree that it is slightly overkill, though.

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                        • #13
                          Next step - focus at infinity for true HUD.
                          (Or how to raid your local airforce base or desert storage facility.)

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                          • #14
                            Couldn't you use a couple of 7449 (or similar) BCD to 7-segment driver chips and save yourself 3 outputs per digit?

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                            • #15
                              Sicarius: If there exists IC's that can decode "inverted" displays, then sure, that would be an option. Remember that I don't just power regular 7-segment displays, the outputs must be inverted since they reflect on the windshield.

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