So for the current project I'm working on, I need to use the arduino to fade in a bank (~20) of parallel LED's. Obviously this is more current than the arduino itself can source, so I need to have the Arduino controlling a transistor that controls the LED's (which are being powered by an outside source).
My question - it seems to me that the PWM used to fade a single LED will no longer work when applied to LED's controlled by a transistor, because the transistor will just be rapidly pulled high and not create a fade...
Does anyone have any help on how I might circumvent this?
(Or am I wrong, and can PWM be used to fade a transistor?)
Quick google searching on how to fade an LED without using PWM brings up this circuit:
Which I suppose could be made work using digital outputs alone... But I would like to avoid as much extraneous circuit building as possible.
So If anyone has any ideas on how to make it happen in a simpler fashion- I would love to hear them.