This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. (COM in the schematic, SIG on the board)to one of 16 channel pins (CHANxx). It works with both digital and analog signals (the voltage can’t be higher than VCC), To control it, connect 4 digital outputs to the chip’s address select pins (S0-S3), This allows you to connect up to 16 sensors to your system using only 5 pins!
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