I don't see why you have to go to *more* then
8 bit resolution. You just have to "map" your
8-bit *linear* value through a table into a 8-bit
*non-linear* value (that controles the PWM regs).

This means that in one end of the table you will map into
a sequense of equal values, and in the other end
you will have "gaps". All to give the impression
of a "smooth" dim.

And the question is also, how many "steps" do you need
to get a smooth dim. Will you see the differense between
two steps in a 128 step dim ? Or a 64 step dim ? I'd guess
not.

Jan-Erik S=F6derholm
=20
Josh Koffman wrote:
>Hi all. I've been playing around with software PWM controlling some
>LEDs. Problem is, as the eye's response to brightness isn't linear, =
when
>I simply control the LEDs brightness using an 8 bit value (with no
>compensation) they don't appear to dim smoothly.

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body