矩阵计算器

const int numRows = 4;//定义4行

const int numCols = 4;//定义4列

const int debounceTime = 20;//去抖动时间长度

const char keymap[numRows][numCols] = { //键值，可以按需要更改

{ '1','2','3','+'},

{ '4','5','6','-'},

{ '7','8','9','X'},

{ '*','0','#','/'},

};

const int rowPins[numRows] = {7,6,5,4}; //设置硬件对应的引脚

const int colPins[numCols] = {11,10,9,8};

//初始化功能

void setup()

{

Serial.begin(9600);

for(int row = 0;row < numRows;row++)

{

pinMode(rowPins[row],INPUT);

digitalWrite(rowPins[row],HIGH);

}

for(int column = 0;column < numCols;column++）

{

pinMode(colPins[column],OUTPUT);

digitalWrite(colPins[column],HIGH);

}

}

//主循环

void loop()

{

//添加其他程序，循环进行

char key = getkey();

if(key != 0)

{

Serial.print("Got key"); //串口打印键值

Serial.println(key);

}

}

//读取兼职程序

char getkey()

{

char key = 0;

for(int column = 0;column < numCols;column++)

{

digitalWrite(colPins[column],LOW);

for(int row = 0;row < numRows;row++)

{

if(digitalRead(rowPins[row]) == LOW) //是否有键值按下

{

delay(debounceTime);

while(digitalRead(rowPins[row]) == LOW); //等待按键释放

key = keymap[row][column];

}

}

digitalWrite(colPins[column],HIGH); //De-active the current column

}

return key;

}

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