TRESADERN J.M wrote:
>
> Hi I was wondering if anybody has done this before or has
> any ideas on how to do this.
>
> I have to count the number of pulses happening in a second
> coming from two different devices.  One of them will have a
> maximum of approx. 200 pulses a second (It is a heart-rate
> monitor) and the other will be approx. 15000 pulses a
> second (This is from a fly-wheel sensor).
>
> Now this is my problem, as the two events are at such
> different speeds does anybody have any idea on how to count
> both of them so that I get a fairly accurate result for
> each.
>
> The idea I had was to count the number of events for the
> fly-wheel in the main-line section of code and use an
> interrupt to count the heart-rate, this way I will not
> hopefully lose any of the pulse for the heart-rate.
>
> Any help on this will be gratefully received.

The Embedded Application book has an example of this. AN592.

--
Neil Cherry     http://home.att.net/~ncherry    ncherry@worldnet.att.net