deskthority

Code: Select all

byte cols[] = {0,1,2,3,4,5,6,7};
const int colCount = sizeof(cols)/sizeof(cols[0]);

byte rows[] = {8,9,10,11,12,13,14,15,16,17,18,19,20};
const int rowCount = sizeof(rows)/sizeof(rows[0]);
 
void setup() {
  for (int x=0; x<colCount; x++) {
    pinMode(cols[x], INPUT_PULLUP);
  }
  
  for(int x=0; x<rowCount; x++) {
      pinMode(rows[x], INPUT);
  }
  Serial.begin(115200);  
}

void loop() {
  // Iterate rows
  for (int rowIndex=0; rowIndex < rowCount; rowIndex++) {
  
    
    // Current row
    byte curRow = rows[rowIndex];
    pinMode(curRow, OUTPUT);
    digitalWrite(curRow, LOW);

    // Iterate columns
    for (int colIndex=0; colIndex < colCount; colIndex++) {
      
      // Current col
      byte curCol = cols[colIndex];
      if(digitalRead(curCol) == LOW) {
        
        // Hit!
        Serial.print("Row: ");
        Serial.print(rowIndex);
        Serial.print(" | Col: ");
        Serial.println(colIndex);
      }
      
    }
    pinMode(curRow, INPUT);
  }
}