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I2C pcf8574 8bit port expander

I made a test / prototype setup on a breadboard with two pcf8574 ics ; one for output and one for input. Both connected to the same I2C bus.

Adding more digital inputs to an Arduino was my first objective, as I am planning to use this on a project which has buttons that control a menu.

For now this little write-up should suffice for the moment I am going to design a PCB for this.

The breadboard built