PCF8574 extension board

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  • PCF8574 PCF8574T I/O For I2C IIC Port Interface Support Cascading Extended Module Expansion Board
  • This is the I/O extended module, which use for I2C interface, you can use two of the module to extend 8 I/O.
  • Support cascading, and you can use at most 8 modules to extend 64 I/O at the same time.
  • Change the address by setting the toggle switches
  • PCB Size: 36 x 16mm/1.41*0.62″
  • Every 2 seconds, make P0-P7 port output High level, Low level, and put 3 toggle switches to ON, the address of module is 0x27.


  • PCF8574, 8 analog digital inputs I2C for Arduino projects, ESP8266, ESP Easy