>I want to add sounds to a product--beeps and boops and the like.
>Can I just hook a piezo speaker to a PIC output pin?
>Or should I use a resistor and/or capacitor in series?

http://www.dontronics.com/see.html#sound
may be an interesting study for producing sounds in the format:

; SOUND port, pin, frequency, duration
; Generates squarewave tones (notes) of the specified frequency and
; duration. This demonstration program shows how to use lookup tables to
; play tunes or effects from data stored in program memory.

This is an extract from the PIC Source Book/Disk by Scott Edwards found
at:
http://www.dontronics.com/see.html

Don McKenzie  mailto:don@dontronics.com   http://www.dontronics.com

Don's Download Dungeon: http://www.dontronics.com/download.html
For more details, send a blank message to mailto:info@dontronics.com
or mailto:simstick@dontronics.com or mailto:basics@dontronics.com