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先实例化一个键盘：

确定行引脚

确定列引脚

const byte rows = 4; //4行
const byte cols = 4; //4列
char keys[rows][cols] = {
  {'1','2','3','A'},
  {'4','5','6','K'},
  {'7','8','9','M'},
  {'#','0','*','O'}
};
byte rowPins[rows] = {5, 4, 3, 2}; //连接到行的引脚connect to the row pinouts of the keypad
byte colPins[cols] = {8, 7, 6}; //连接到列的引脚connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, rows, cols );//构建库函数，参数是制作键盘矩阵地图，行引脚，列引脚，行数，列数）

库函数

初始化并使硬件键盘产生映射（键盘地图 keys[rows][cols])

void begin(make Keymap(userKeymap))

请参见文件->示例->键盘->示例-> CustomKeypad

接受按键返回值


char getKey()

返回按键的状态（4个）



空闲，按下，释放，保持


KeyState getState()

按键状态的切换


boolean keyStateChanged()

设置用户必须按住按钮直到触发HOLD状态的毫秒数。

setHoldTime(unsigned int time)

设置延迟时间来实现键盘软件防抖动


setDebounceTime(unsigned int time)

增加键盘监听事件


addEventListener(keypadEvent)

监听键盘是按下，释放，还是保持？

详见下面具体示例2。

具体例子说明

接受键入示例：

#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'0','1','2','3'},
  {'4','5','6','7'},
  {'8','9','A','B'},
  {'C','D','E','F'}
};
byte rowPins[ROWS] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); //例化键盘，例化名为customKeypad, 矩阵