8-bit shift registers (expand output) - 74HC595
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8-bit shift registers. These can be used to easily expand the number of outputs at your disposal. With one chip you get an additional 8 digital outputs, using only 3 pins on your Arduino. You can also string them together (ie. with two chips you get 16 outputs from 3 pins with three chips you get 24 outputs from 3 pins and so on)