The excellent YouTube channel Computerphile has a great video up for the holidays on creating festive flashing lights with a Raspberry Pi. The video is a great overview of how you can use flip-flops (basic digital circuit building blocks) to control many LEDs from the GPIO pins on a Raspberry Pi. Be sure to check out other good videos from Computerphile like their intro to the Raspberry Pi, geeking out about Postscript, or how the Engima encryption code was cracked.
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