const int colPins[5] = {7,8,9,10,11}; // 行引脚
const int rowPins[5] = {2, 3, 4, 5, 6};   // 列引脚
void setup() {
    for (int i = 0; i < 5; i++) {
        pinMode(colPins[i], OUTPUT);
        digitalWrite(colPins[i], HIGH);
    }

    for (int i = 0; i < 5; i++) {
        pinMode(rowPins[i], INPUT_PULLUP);
    }
    Serial.begin(9600);
}

void loop() {
    for (int lie = 0; lie < 5; lie++) {
        digitalWrite(colPins[lie], LOW); // 激活当前行
        for (int hang = 0; hang < 5; hang++) {
            if (digitalRead(rowPins[hang]) == LOW) {// 检测到按下
                delay(50); // 添加延时以防止开关抖动 
                if (digitalRead(rowPins[hang]) == LOW) {
                  Serial.print("Switch at lie ");
                  Serial.print(lie);
                  Serial.print(" hang ");
                  Serial.println(hang);
                }
            
                
            }
        }
        digitalWrite(colPins[lie], HIGH); // 恢复当前行
    }
}