Use the PIC to do PWM.  Or you could possibly use some CMOS logic
 chips to do the PWM.

                                               Regards,

                                                 Jim




> I need to fade on and fade off like 20+ LEDs, and I need to do it as
> cheaply as possible. The fade on and off should be quick and smooth.
> Right now what I'm working with is this: some 8 bit DAC hooked up to a
> PIC which will count from 0 to 255, then back down again on one of the
> ports that's connected to the DAC. I have some questions:
>
> Is there any cheaper way to do this without the DAC or PIC?
>
> What is the cheapest DAC you suggest? Maybe a multichannel one would be
> cheaper?
>
> Would it be better to get a DAC that changes voltage or current?
>
> Any ideas/suggestions would be great. Thanks!
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu