Since multiplexers can also process digital signals, you can use it to transmit serial data at TTL level to multiple devices via pipeline or transmit from multiple devices. Drive it to a high level, and it will completely disconnect the common pins (all switches are disconnected). It is suitable for digital and analog signals (voltage must not exceed VCC) and can be connected in both directions. To control this, connect the four digital outputs to the address selection pin of the chip (SO-S3) and send the binary address of the desired channel. This is a very practical 16-channel CD74HC4067 analog/digital multiplexer/demultiplexer. The internal switch is bidirectional, with low resistance when turned on and leakage when turned off. To prevent call-through, turn off the switch first, then turn it on. Color: blue Material: PCB Package Contents: 10 * CD74HC4067 Analog Multiplexer Only the above package content, other products are not included. Note: Light and different screens may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.