Provides more Analog inputs to ESP8266
16 CHANNEL ANALOG MULTIPLEXER HC4067
The 74HC4067 can operate on voltages between 2 and 6V DC, which allows use with 3.3V and 5V microcontrollers and boards such as Arduino and Raspberry Pi.
(If for some reason you have the 74HCT4067 it can only work on 4.5~5.5V DC)
This chip is like a rotary switch -
It works with both digital and analog signals (the voltage can’t be higher than VCC), and the connections function in either direction.
To control it, connect 4 digital outputs to the chip’s address select pins (S0-
Since the mux/demux also works with digital signals, you can use it to pipe TTL-
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-
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-
The board also breaks out the chip’s "enable" pin, which when driven high, will completely disconnect the common pin (all switches "off").