CD74HC4067 16-channel analog/digital multiplex/demultiplex breakout board - Versatile signal handling: supports both digital and analogue signals (voltage must not be as VCC). The board is designed to be connected in one direction and used as a multiplex or demultiplex switch. - Simple control method: use 4 digital outputs connected to the address selection pins S0-S3 on the chip and send the binary address of the desired channel. This arrangement allows you to connect up to 16 sensors or devices to your system using only 5 pins in total. - Flexible bidirectional communication: for bi-directional data, you can add a second board to route the transmitter (Tx) line of the microcontroller to the receiver (Rx) line of the 16 devices. By using multiple boards you can create similar arrangements for I2c, SPI, and other protocols. - Serial data routing capability: since the Mux/Demux can also process digital signals, you can use it to transfer serial data in TTL format to multiple devices. For example, connect the Tx pins of 16 devices to a single Rx pin on the microcontroller, and use the address lines to select which device listens at any given time. - Practical functionality and operation: this is a convenient 16-channel analog/digital multiplex/demultiplex breakout board based on the CD74HC4067. The chip functions like a rotary switch, internally routing a common pin (Com in the wiring diagram, on the board) to one of 16 channel pins (Chanxx) at a time.