Hello all, new day, new problem :s. trying to get this code to work: #include <Wire.h> #include <LiquidCrystal_I2C.h> #include <Keypad.h> const byte rows = 4; const byte cols = 4; char keys[rows][cols] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byt…

invalid conversion

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