I've built an instrument that displays RPM/PERIOD/FREQUENCY on an LCD
display, using an 'F84.  You could modify the circuit & software to use LEDs
if you so desire.  It's overkill for your application, but you could study
the code & modify it for your own needs.  The program would be a lot smaller
without the other two features (essentially,, the RPM section averages 10
cycles (pulses) to determine the RPM).

 Let me know if you want it.

Dennis

----- Original Message -----
From: "Luberth Dijkman" <Luberth@GEOCITIES.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, November 03, 2002 3:26 PM
Subject: [PIC]: Tachometer RPM for car or metalworking machine(lathe Mill
Drill)


> Hello all,
>
> I would like to make a tachometer
> all i can find on the web are examples of freq meters
>
> i would like to use:
>                                 pic16F84
>                                 7x 7sement led's  (20 000RPM)
> maybe an extra ic for each segment so that the multiplexing speed of leds
is not
> important and a brighter less flikkering display is the result
>
>
> would like to measure the time_between_pulses
> and 60sec/time_between_pulses is RPM i would say
> update display and do it again
>
>
> is there maybe someone who has done this already
> or could point me to a project
> or maybe someone is willing to help with the code
>
> hope to hear from you
>
> luberth
> http://luberth.com
>
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