#define ROW_1 4
#define ROW_2 5
#define ROW_3 6

#define COL_1 15
#define COL_2 16
#define COL_3 17
#define COL_4 18

// Define row and column pin arrays
const int rowPins[3] = {ROW_1, ROW_2, ROW_3};
const int colPins[4] = {COL_1, COL_2, COL_3, COL_4};

// Store the previous state of each button in the matrix
bool previousButtonState[3][4] = {0};

void setup() {
  Serial.begin(115200);

  // Initialize row pins as outputs
  for (int row = 0; row < 3; row++) {
    pinMode(rowPins[row], OUTPUT);
    digitalWrite(rowPins[row], HIGH); // Set row pins to high initially
  }

  // Initialize column pins as inputs with pull-up resistors
  for (int col = 0; col < 4; col++) {
    pinMode(colPins[col], INPUT_PULLUP);
  }
}

void loop() {
  // Scan the button matrix
  for (int row = 0; row < 3; row++) {
    // Set the current row to low
    digitalWrite(rowPins[row], LOW);
    // Read the state of each column
    for (int col = 0; col < 4; col++) {
      bool currentState = !digitalRead(colPins[col]); // Invert since LOW means pressed
      if (currentState != previousButtonState[row][col]) {
        if (currentState) {
          Serial.print("Button pressed at row ");
          Serial.print(row);
          Serial.print(", column ");
          Serial.println(col);
        } else {
          Serial.print("Button released at row ");
          Serial.print(row);
          Serial.print(", column ");
          Serial.println(col);
        }
        previousButtonState[row][col] = currentState;
      }
    }
    // Reset the current row to high
    digitalWrite(rowPins[row], HIGH);
  }

  delay(20); // Adjust delay as needed
}