Well, this is exactly what you want, no conversion. However, if it makes
you feel better. Glue two tiny magnets (or 4) and divide appropriately.
These Hall sensors are pretty reliable when setup properly.

  ----- Original Message -----
  From: "Alan B. Pearce"
  To: "Microcontroller discussion list - Public."
  Subject: Re: [EE] Old cars - gadget
  Date: Fri, 1 Dec 2006 09:29:59 -0000


  > I think you'd be way better off epoxying a small magnet to your
  harmonic
  > balancer and mounting a Hall Effect sensor to read it.

  Hmm, only give one pulse per revolution. I would look at something
  that
  would sense the starter ring gear teeth - lots of pulses per rev.

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