74HC595 8bit Shift Register
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8-bit serial-in, serial or parallel-out shift register.
A shift register has many uses but one of the most popular is to expand the number of digital outputs on a mictrocontroller. Each one of these 74HC595s can act like 8 more digital outputs, and you can daisy chain them. So you could connect 8 of them up next to each other and have control of 64 outputs.
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