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Tutorial Arduino RevBurner driving a tachometer.

Discussion in 'DIY peripherals' started by jamesdio, Oct 11, 2014.

Page 4 of 4
  1. cazsan

    cazsan Member

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    I finally got it working removing 12V zener diode...
    I don't know why but it seems to be embedded in my aftermarker tachometer gauge
    cazsan, Aug 14, 2020
    #61
  2. peel

    peel New Member

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    hello experts, please help. If I connect the tachometer according to the original instructions, it does not work. However, if I connect the GND from the Arduino to the emitter, the tachometer works correctly. Why is that so?
    Tacho: https://a.aliexpress.com/_mLG2mnK
    upravene.png
    peel, Mar 5, 2022
    #62
  3. Etcho

    Etcho New Member

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    @peel , you just saved my life. I've been trying everything I could try, replaced all the components, with no luck. I just did the ground trick you suggested and now it works.
    Etcho, Apr 16, 2022
    #63
  4. AVSTech

    AVSTech New Member

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    Hey, all!
    I tried using the provided circuit for my tachometer (Auto Gauge 8000RPM) nothing worked. Then I checked my tachometer by quick taps to +12V with the green signal wire - the hand moved. So I realized that my tachometer is switched to a positive signal. Accordingly, I had to use a PNP transistor to work, so I chose 2N3906 - as I had it in stock.
    The total circuit looks as follows:
    upload_2023-12-11_16-39-26.png

    Best Regards
    • Informative Informative x 2
    • Like Like x 1
    AVSTech, Dec 11, 2023
    #64
  5. Stefan Koopmans

    Stefan Koopmans New Member

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    @AVSTech, After a week of fiddling around without a multimeter I had no way to understand why my Tacho was not working properly. Your explanation got me on the right path though. I could also get the needle to move by tapping the green wire to 12V. I searched around my old pile of electronics boards to find a suitable PNP transistor and used your diagram as a reference. It also happens to be a very small TO-92 transistor, even weaker than yours. I also used a very small glass zener diode and I don't even know it's specs, can't read it. Anyway it finally works! Thanks a lot! Signed up here specifically to make this post :)
    • Like Like x 2
    Stefan Koopmans, Jan 21, 2024
    #65
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