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Change taco needle colour with engine RPM

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  • Change taco needle colour with engine RPM

    A tacho/speedo whose needle changes colour while in a certain rev range. ie from 0-2500rpm needle is white; 2500-5000 needle is purple; 5000-few hundred rpm below redline needle is orange and above that would obviously be a red needle. I borrowed the idea from an episode of Top Gear where they reviewed a 70,000pound beast.

    Would probably be best applied to the OBD dashboard projects going on.

    Anyone have the programming skills to know where to start? Any DirectX programmers reading?
    Rode-B[O]X: scrounging components

    Bits I bought:
    Xenarc 700TSV | DSSC | GPS18PC
    Pieces Im looking at:
    Axus TC600 WINXPe | EPIA * | GPS gadgets

  • #2
    Originally posted by trillion
    Would probably be best applied to the ODB dashboard projects going on.

    Anyone have the programming skills to know where to start? Any DirectX programmers reading?
    I'm guessing you mean a software speedo??

    If so that's a fairly simple implementation, i'm sure those working on the digital guages could support that easily.
    Caputer Mk. II
    '02 VX Holden Commodore Series II Executive
    MII12000, 512MB RAM, 60GB HDD (5400rpm), 16X DVD, TS200V
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    • #3






      Rode-B[O]X: scrounging components

      Bits I bought:
      Xenarc 700TSV | DSSC | GPS18PC
      Pieces Im looking at:
      Axus TC600 WINXPe | EPIA * | GPS gadgets

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      • #4
        So sick.

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        • #5
          Thats easy, just have a multicoloured LED in the root of the needle and a switches that are activated when the needle passes them - eg rotory encoder onthe back or something

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          • #6
            I prefer my taco's without needles thank you.
            Hot sauce is much better for that extra kick.
            [H]4 Life
            My next generation Front End is right on schedule.
            It will be done sometime in the next generation.
            I'm a lesbian too.
            I am for hire!

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            • #7
              would be nice to see the color morphing in between and not just switching.
              [....99.9%]
              [HW] 566eMHz/128mb/6gb, FlyVideo3k, RandMgps, M1-ATX, 7" Lilliput, VGA2AVadptrFor2ndVideo, 4CH/100rms, 10"Sub, 40AhDeepCycleTank
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              • #8
                Use something like all the recent pens and such use that switch colors. 3 or 4 leds that light up by themselves and in union with the others to create several colors...
                06' BMW 330i
                SG|Beige Dakota|Poplar|iDrive w/MP3|PP|SP|CWP|PDC|Comfort|Shades|40% Tint

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                • #9
                  A friend of mine had one of these ice cubes that change colors....pretty cool
                  http://cgi.ebay.com/ws/eBayISAPI.dll...tem=4345852861
                  06' BMW 330i
                  SG|Beige Dakota|Poplar|iDrive w/MP3|PP|SP|CWP|PDC|Comfort|Shades|40% Tint

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                  • #10
                    just do it mechanically
                    get a couple 3mm or surface mount high-output LEDs and arrange them so that the tach needle gets lit up by them successively.

                    Like, have the red one pointing at the right angle for the redline, and the purple one next to it so it lights the needle up that way and so on.. (i'd post drawings but you guys can figure it out)

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                    • #11
                      how would that work without also lighting up the dash board behind the needle?
                      Rode-B[O]X: scrounging components

                      Bits I bought:
                      Xenarc 700TSV | DSSC | GPS18PC
                      Pieces Im looking at:
                      Axus TC600 WINXPe | EPIA * | GPS gadgets

                      Comment


                      • #12
                        well, there needs to be some sort of light source at the end of the needle, right? and that light source can't spill out onto the rest of the dash anyways so there's got to be a black sheath around it anyways, right?

                        so, instead of having one light source shining in all directions, you have multiple light sources focused at different angles, that's the only difference between the setup i'm proposing and a lightbulb.

                        I haven't actually done it, and i don't know if it would be easy, but i'm willing to bet it would be easier than doing some silly gray code shaft encoder noise.

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                        • #13
                          Back from the dead,...
                          so so sick.
                          Someone needs to show me how its done.

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                          • #14
                            Originally posted by Diewlay Lowmo
                            Back from the dead,...
                            so so sick.
                            Someone needs to show me how its done.
                            Go find a Noble and rip his dash out

                            There is a new one driving round Bristol, everytime i go swimming i see him or hear him - very distinctive as the exhuast is tuned to hell and rasps away and then the dump valve kicks in when he changes gear. The bird int he passenger seat didn't look too happy when he was ragging it up the road the other day - can't imagine it's the most comfortable city car.

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                            • #15
                              Especially as shes only there for his cash!

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