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Inductive Sensor

Discussion in 'Electronic Design' started by Marco Santos, Dec 8, 2004.

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  1. Marco Santos

    Marco Santos Guest

  2. These sensors are like a little clamp-on ammeter that gives you a
    pulse every time the plug fires. I'd guess the spark current is in the
    scores of mA, so there's lots of signal. What are you planning on
    using to read the frequency signal?

    Best regards,
    Spehro Pefhany
  3. dalai lamah

    dalai lamah Guest

    First of all, if you can pick up the RPM signal from the ignition coil
    primary or from a phonic wheel on the crank shaft, this is the preferred
    way: you will get a far cleaner signal.

    If you must pick up the signal from the spark cable, you can do it - and
    most of these sensors do it, even the PI - by capacitive coupling: put a
    wire near to the spark cable (no need to make a lot of windings), then
    input the signal to a monostable with an high impedance input (for
    example a CMOS version of a 555). You will get a signal with duty cycle
    proportional to the RPM. Then you can filter it to get a proportional
    voltage and there you go.
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