### 按下按钮时，键盘矩阵代码未返回正确的列号

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1 作者的声誉

``````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列将根据按下的时间从0-3返回一个随机值，该时间应在行读取为高时返回设置为高的列。不知道如何解决这个问题，很肯定在void loop（）中的第一个for循环存在问题。

### 回应 (1)

0

1 作者的声誉

``````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);
}
}
}
``````