Ok, did some more looking. Forward Voltage rating is the voltage drop. So if
I have a 1.6V LED and a 5V source I subtract 1.6 from 5 and divide by the
current rating to find that I need a 170ohm resistor. Damn, feel like an
idiot on that one.


So, do I run a PIC output close to its max. sink rating (25mA in my case) to
direct drive an LED at 20mA or should I increase the resistor to get around
15mA?

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