1. As the Mux / Demux can also support digital signals, it can be used for transferring serial data at Ttl level to multiple devices. For example, it can be used to connect 16 devices to an Rx pin on the microcontroller. Then you can choose any of the 16 devices. 2. If you need bi directional communication, you can add a second plate to guide the Tx line of the microcontroller to 16 devices. With multiple tiles, you can create similar circuits for I2c, SPI, ETC. 3. It can support digital and analogue signals (voltage cannot exceed VCC) and can be connected in any direction. To control, connect 4 digital outputs with the pins for selecting the chip address (S0 S3) and send a binary address of the desired channel (details in the data sheet). This allows you to connect up to 16 sensors via a 5 pin system! 4. This is a very comfortable 16 channel CD74HC4067 clamp plate with multiplexing/demultiplexing analog/digital. This chip works like a rotary switch internally directs the common (Com on the check, sign on the plate) to one of the 16 channel s (Chanxx).