> What PIC microcontrollers do the opposite - convert a value (0-255 or
> 0-1023) into a 0-5V voltage output?

Jason,

There are PICs with D/A modules (eg the 16-bit families)

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2629&param=en533465

where you'll find links to application notes, for example ADCPM

but a D/A can be made from any PIC with a little h/w. PWM
into an integrater for example. This can be as simple as an RC filter

> What examples of completed projects that use the D/A are there?

Depends what resolution you're looking for. 8-bit ? 10 ? 12 ? 16 ?

http://www.romanblack.com/picsound.htm

http://www.embedinc.com/pic/hal.htm



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