hello RossW

Rossw>>Just wondering whether anyone knows if PICs can sink enough current to drive a 5mm white LED. These take higher voltages than regular LEDs (around 4.5V, I think) and need more current, too. If they can't, I guess I'll have to hook up an NPN transistor ...<<

Yes.. they can drive up to 20mill per pin. they run 5 volts 20mills. I have driven Whites

Dwayne