Hi I'm using a master and slave setup and I've come to a halt in my project since a value is not defined and I have no clue what to define it! Anyone here smart enough to help me? =) I've marked the error in the code with /////ERROR////// #include <SPI.h> #include <Keypad.h> #include <MFRC522.h> #…

Master code = Keypad change(); cmd error

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