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Digital tachometer with control and logging etc.

Discussion in 'Electronic Basics' started by [email protected], Jan 13, 2005.

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  1. Guest

    Hi all,

    I would like to build a digital tach that does a bit more than just
    display the speed of an automotive engine.

    I'd like to have the following features:
    -engine speed display
    -2 or 3 analog inputs aside from the engine firing signal
    -ability to control say 3 or 4 outputs based on inputs
    -limited logging that the unit could analyze to control the outputs

    I've dabbled in electronics for a few years but haven't done much since
    the "advent" of the PIC. It seems like a PIC would be the place to
    start for this project. Any suggestions on units and development kits?
    Something easy to program would be a big plus. I have an engineering
    background but not in EE... ;-)
    Thanks in advance for any input!

  2. Richard

    Richard Guest

    Yes, I pic would be the lowest component count item and would be easy.

    You have Microchip and Atmel out there and many others. Atmel use to sell a
    development kit for about 50 bucks, came with everything. Not sure if it's
    that cheap anymore. There are some freeware basic compilers for the atmel
    if your code is small enough, and if not, the registration fee is very

    For the pic's, I use the ME Labs Pic Basic Pro. They have a light version
    as well. Makes life much easier than using ASM.
    You never mention what type of ADC you wanted? 8, 10, 12 bit? Still all
    available in a single chip.

    You could also use a LM2907 Freq to Voltage converter. But me, I'd use a
    pic for the entire project.

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