20pcs CD74HC4067 ADC CMOS 16CH Channel Analog Digital Multiplexer Module Board Sensor Controller

Description 1 This is a 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 cant be higher than VCC and the connections function in either direction To control it connect 4 digital outputs to the chips 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 2 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 microcontrollers TX line to 16 devices RX lines By using multiple boards you can create similar arrangements for I2C SPI etc 3 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 chips enable pin which when driven high will completely disconnect the common pin all switches off Features 2V to 6V operati