I'm working on a project that needs to get numeric input on several questions form user. I bought this keypad but after connecting it, I received a lot of input form certain keys (A, 7 and 1). It also depends if I move the keypad without pressing any button. In addition, sometimes if I press a key…

Are you actually using an R4? I had to modify the Keypad library to get it work with that board. If you see a warning like that below, you're likely running into the same problem. Using pinMode() INPUT_PULLUP AVR emulation In Keypad.h, change #ifndef INPUT_PULLUP to #if !defined(INPUT_PULLUP) &…

Bad behaviour using keypad

Official Hardware UNO Family UNO R4 WiFi

trc1981 March 6, 2024, 6:11am 5

I tried now as you wrote, but I have the same behavior: if I just touch keypad o the flat cable it starts outputting keys continuously.
Do you have any idea?

Thanks

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Bad behaviour using keypad

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