PCF8575 and Keypad

[Bert]

Hello! I am hoping to use the PCF8575 and your library on a musical keyboard project.

In my Arduino sketch-in-progress, I am using this Keypad library to detect piano key presses – and when I use the built-in pins of an Arduino Uno, I can get it to work.

Now, I would like to free up my Arduino pins with a PCF8575 module, but I cannot seem to understand how to tell “Keypad” to use the PCF8575 pins instead. Does anyone have any insight or suggestions? Thank you.

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[Renzo Mischianti]

Hi Bert,
the library you use does not support pcf8574, so I think It’s better if you create a simple function to scan which pin is selected and retrieve the keypad button.
Bye Renzo

[Author]

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