PCF8574 I2C Input/Output Multiplexer Module

It is a module where you can increase your I/O Input/Output number by using it with your controller card. It has PCF8574 integrated on it. In this way, we can obtain 2 I2C or 8 inputs and outputs. It works with 3.3 or 5v.  When all DIP switches are OFF, the I2C address is 0x27.