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CD74HC4067 16-Channel Analog Digital Multiplexer Breakout Board Module For Arduino
*This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. *This chip is like a rotary switch - it internally routes the common pin (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),and the connections function in either direction. *To control it, connect 4 digital outputs to the chip’s address select pins (S0-S3),and send it the binary address of the channel you want (see the datasheet for details). *This allows you to connect up to 16 sensors to your system using only 5 pins! *Since the mux/demux also works with digital signals,you can use it to pipe TTL-level serial data to or from multiple devices. *For example, you could use it to connect the TX pins of 16 devices to one RX pin on your microcontroller. *You can then select any one of those 16 devices to listen to. *If you want two-way communications, you can add a second board to route your microcontroller’s TX line to 16 device’s RX lines. *By using multiple boards, you can create similar arrangements for I2C, SPI, etc. *The internal switches are bidirectional, support voltages between ground and VCC,have low “on” resistance and low “off” leakage, and to prevent crosstalk, perform “break- before-make” switching. *The board also breaks out the chip’s “enable” pin, which when driven high,will completely disconnect the common pin (all switches “off”).