[See File -> Examples -> Keypad -> Examples -> EventSerialKeypad] or see the KeypadEvent Example code. 06示例代码 #include<Keypad.h>constbyte ROWS =4;//four rowsconstbyte COLS =3;//three columnscharkeys[ROWS][COLS] = { {'1','2','3'}, {'4','5','6'}, {'7','8','9'...