Dear Andre,

I used to build a datalogger for motorcycles. It measures speed, RPM and
several analog channels too.
When the revolution pulses keep away the RPM rate drops automatically. I
extended the 16-bit timer
to be able to measure low revs and speed.

I just posted the code on the PIClist web site. It is the complete listing,
including memory handling
and communications and may therefore be a bit overwhelming. I suggest you
have a look at the interrupt
code first. The comments should help you on your way. Please have a look an=
d
see if you can use it:

http://www.piclist.com/Techref/member/AT-planet-T9/datalogger.htm

With kind regards,
-Andries

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