> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Jens M. Guessregen
> Sent: 19 February 2011 15:19
> To: 'Microcontroller discussion list - Public.'
> Subject: RE: [PIC] RPM measurement question
>=20
> > > "You can also "sanity-check" your data, knowing that the engine can't
> > > instantly change its speed by a large amount."
> > >
> > > Maybe this engine cannot, but others can.
> >
> > If you are looking at the period between consecutive spark events, then
> you
> > shouldn't see a dramatic delta even in very high revving/low inertia
> engines
> > i.e. the engine isn't going to halve or double it's speed between one
> spark
> > and the next.
>=20
> 40=B0 degree difference are not nothing, but even not half or double spee=
d.
> But if you ignore 40=B0 difference, you do not need to think about 10, 12=
 or
> 14 bit resolution of a counter ...
>=20
> Best Jens

Sorry but that makes no sense at all:

1) Why would you want to ignore cycle to cycle phase changes?
2) Why would you need to throw away resolution?

Mike

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