按下按钮时，键盘矩阵代码未返回正确的列号

Keyboard Matrix code not returning correct column number when a button is pressed

本文关键字：返回 代码 按钮 键盘      更新时间：2023-10-16
int ColumnPins = 4;  //How many column pins
int RowPins = 5; //How many row pins
int Columns[] = {0, 1, 2, 3}; //Column pinNumbers
int Rows[] = {4, 6, 7, 8, 9}; //Row pinNumbers
void setup() 
{
  pinMode(13, OUTPUT);
  for (int counter = 0; counter < ColumnPins; counter++) 
  { //set all the columns to output
    pinMode(Columns[counter], OUTPUT);
  }
  for (int counter = 0; counter < RowPins; counter++) 
   { //set all rows to input
    pinMode(Rows[counter],INPUT_PULLDOWN);
    }
}
void loop()
{
  for (int ColumnIndex = 0; ColumnIndex < ColumnPins; ColumnIndex++) //sets column pins to high 1 by 1 
  {
    digitalWrite(Columns[ColumnIndex], HIGH);
    RowScan(ColumnIndex); //calls function rowscan checks whether and row is HIGH 
    digitalWrite(Columns[ColumnIndex], LOW);
  }
}
void RowScan(int ColumnIndex) //Scans each rowpin and checks whether any reads high
{
  for (int RowIndex = 0; RowIndex < RowPins; RowIndex++) 
    {
      if (digitalRead(Rows[RowIndex]) == HIGH) //if Rows at rowindex is high
      {
        for (int blinks = 0; blinks <= RowIndex; blinks++)
        { //Outputs # of blinks based on which row HIGH was read
          // print index
          digitalWrite(13, HIGH); //LEDPIN high
          delay(250);
          digitalWrite(13, LOW);
          delay(500);
        }
        for (int blinks = 0; blinks <= ColumnIndex; blinks++)
        { //Outputs # of blinks based on which row HIGH was read
          // print index
          digitalWrite(13, HIGH); //LEDPIN high
          delay(100);
          digitalWrite(13, LOW);
          delay(100);
        }
      }
    else if (digitalRead(Rows[RowIndex]) == LOW) //Rows at index o is LOW
    {
      digitalWrite(13,LOW);
    }
  }
}

C Arduino IDE列是根据按下按时间返回0-3的随机值，而在该行读取较高时，它应该返回设置为高的列。不确定如何确定可以很好地确定void loop中的第一个循环（）。

我认为，如果我们将索引打印到串行显示器以查看是否有效，那是最好的。在下面尝试这些代码。

int totalCols = 4;
int totalRows = 5;
// exclude pins 0 and 1 since these are used for Serial communication
int keyCols[] = { 2, 4, 5,  6     }; 
int keyRows[] = { 7, 8, 9, 10, 11 };
void setup() 
{
    Serial.begin(9600); // begin Serial Communication at 9600 baudrate
    pinMode(13, OUTPUT);
    for (int i = 0; i < totalCols; i++)
        pinMode(keyCols[i], OUTPUT);
    for (int i = 0; i < totalRows; i++) 
        pinMode(keyRows[i], INPUT); // you can use INPUT instead
}
void loop() {
    for (int i = 0; i < totalCols; i++) {
        digitalWrite(keyCols[i], HIGH);
        ScanActiveRows(i);
        digitalWrite(keyCols[i], LOW);
    }
}
void ScanActiveRows(int col) {
    delay(5); // wait for 5 milliseconds after setting column pin
    for (int row = 0; row < totalRows; row++) {
        if (digitalRead(keyRows[row]) == HIGH) {
            // print column and row indices
            Serial.print("Column : ");
            Serial.println(col);
            Serial.print("Row : ");
            Serial.println(row);
        }
        else if (digitalRead(keyRows[row]) == LOW) {
            digitalWrite(13,LOW);
        }
    }
}

如果以上代码输出精确的列和行，则眨眼前是问题。我希望这有帮助。这是我第一次回答。：）

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