CD74HC4067 16-Channel Analog/Digital Multiplexer/Demultiplexer board. Features the CD74HC4067 16-channel analog signal switch. Analog signal input: C0-C15 (16 channels). Analog output: COM. Channel control: S0-S3. Compatible with both digital and analog signals (signal voltage must not exceed VCC). Connections are bidirectional. For two-way communication, a second board can be used to route a microcontroller's TX line to 16 device RX lines. Multiple boards can be used for applications involving I2C, SPI, and other protocols. Internal switches are bidirectional, support voltages from ground to VCC, have low on-resistance and low off-leakage current, and feature break-before-make switching to prevent crosstalk. The board includes access to the chip's enable pin; when set high, it disconnects the common pin (all switches off). Control the channel selection using digital outputs to the address select pins (S0-S3) by sending the binary address of the desired channel. Enables connection of up to 16 sensors using only 5 microcontroller pins. Since the multiplexer/demultiplexer supports digital signals, it can route TTL-level serial data to or from multiple devices. For example, connect the TX pins of 16 devices to one RX pin on a microcontroller and select which device to listen to. Material: Plastic Color: Blue Package Contents: 12 x CD74HC4067 16-channel analog module Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement error allowed within +/- 1-3 cm.