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                                            Joe Young

Option to also use arduino ports?

Interesting idea, thanks. I'll leave this issue open here for anyone else to see the approach. If there's additional interest, I can incorporate it in the library. There is also...

Keystrokes

There should not be any difference between arduino using esp32 and arduino with ATMEGA328 processors. I suspect this issue results from a use problem. The Keypad library and all of...

Option to also use arduino ports?

I have not tried the method mentioned above, but it should work OK. An alternative which would use the existing libraries but adds another PCF8575, connect the ninth row and...

Option to also use arduino ports?

I should also add to the comment above that for the case when you can access the wiring (the second possibility mentioned by Assamita81) the existing libraries Keypad_I2Ca can be...