4051 8-channel analog multiplexer/demultiplexer breakout board
Product information:
With this 74HC4051 chip you have 8 input/output ports at your disposal. You connect it to 3 ports of your Arduino. Then you can control or read the 16 ports. For example, you can control 8 LEDs or read 8 input values at the same time.
Check out the website link for a tutorial.
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