Hi all,

this is for VW bug engine.
I have square wave pulse. I use function generator to generate it. every 4t=
h=20
pulse is =20
1 cycle. I am using pic12f683 capture input to read this pulse and I setup =
to=20
read every 4th pulse. some thing=20
basic I am not picturing right. I need to find out how fast this engine (pu=
lse)=20
is running so engine is based on RPM
revolution per minute. in this case I have to setup a time and count pulses=
 to=20
determine the speed. Since it is RPM
counting 1 minute makes no sense so my question is how fast I should count=
=20
pulses to determine RPM? another words
lets say RPM shows 1000 revolution per minute if break it down will be  in =
1=20
second 16.666 revolution so
should I count for 1 second and expect 16 or 17 counts?=20

I do not know for some reason I am not picturing  it right...

any suggestion ?


thanks

Andre


     =20
--=20
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