You might look at setting your pwm values with a lookup table if you want to
have a smooth bloom and dim cycle.  LED's aren't linear on their percieved
light output.  When I did them the table was more logrithmic.   I ran into
this when working on a magic trick a few years ago...
-Dal
----- Original Message -----
From: "Magnus von Rosen" <pt98mvo@STUDENT.BTH.SE>
Subject: [EE] How to fade a LED?


> Hi,
>
> I would like to make a LED fade up and down by using a PICF628.
> I imagine that it could be done by alternating periods of on/off.
>
> However, it seems like a _lot_ of experimentation is required, or a
> little experince.

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