Here is simple code to utilize common/cheap ebay i2c lcd adapter for buttons instead. To wire it put your buttons between GND Pin #1 (nearest i2c connections with square around it) and: Pin #4 (button 1) Pin #5 (button 2) Pin #6 (button 3) Pin #11 (button 4) The following pins are also suitabl…

Common PCF8574 i2c LCD module as Button interface.

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