> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Bruno L. Albrecht
> Sent: 28 May 2009 15:12
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] frequency to voltage converter (FVC)
> 
> i'm already trying the integrator...the problem is that the pulse that
> comes
> from the encoder is almost an impulse! the capacitor doesn't charge
> enough...


If encoder delivers a pulse for a fixed angle of rotation this could
never work anyway, since the integrated voltage would be the same
irrespective of the motor shaft speed.

You need to use a monostable multivibrator (AKA "one-shot") triggered by
the encoder prior to integration.

Regards

Mike

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