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1  Using Arduino / LEDs and Multiplexing / Re: How to drive dozens of LEDs from an UNO R3 for a Christmas project on: November 15, 2012, 01:16:00 pm
If the leds need to be either on or off, you could get a cheap shift register (or four).  Something like this:

Then use the shift out to control it:

You can daisy chain 4 of them to control your 32 leds
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