A while ago I've did a toy acting as a simple VU-meter with a PIC16F628
using the internal comparator and it's reference. The paper is published in
a magazine, unfortunately in Romanian language, useless for you.

If you need only the sinusoidal level, then it's easy even without an A2D
converter.


On Mon, Aug 11, 2014 at 2:48 PM, <alan.b.pearce@stfc.ac.uk> wrote:

> Added PIC tag ...
>
> > I am interested in designing an LED VU meter based on a PIC for use in
> > professional audio. I know there are several designs around on the net
> for
> > consumer use BUT they all rectify the incoming signal before processing
> it in
> > the PIC. This limits the ballistics that can be emulated and all of the
> examples
> > I have come across so far have particularly poor ballistics. For
> professional
> > use I would want to AtoD the audio and carry out all processing inside
> the
> > PIC.
> > Has this been done already or am I breaking new ground.
> >
> > Any help appreciated.
>
> Are you looking at doing a VU meter or a PPM?
>
> http://en.wikipedia.org/wiki/Peak_programme_meter
>
> many of the LED VU meters seem to combine the two functions by having a
> single bar showing the peak while the level dances around under it. The b=
ar
> showing the peak is then controlled in the manner of a PPM.
>
>
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