The first output, P1004 is ready.

P1004 Module is member of Sm Extensions product family.

The module is a I2C controlled, dynamic addressed, four port digital I/O extender which provides user selectable functions.

P1004 designed by Selcuk İyikalender.


  • +3.3V supply operation
  • 2 Counter Units
  • 4 Digital I/O Port , configurable to
  • General Purpose I/O
  • Pulse Width Modulation
  • Output Toggle
  • Extertnal Clock Source for Counter Units (only 2 port supports this function)
  • I2C communication as a host interface


  • DIY, Maker Projects
  • I/O Extender for endustrial projects
  • Motor Control, LED Control

Samples on github