#include  <Keypad.h>

const int numRows = 3;
const int numCols = 4;

// Define the connections to the button matrix
const int rowPins[numRows] = {2, 3, 4};
const int colPins[numCols] = {5, 6, 7, 8};

// Define the keymap
char keymap[numRows][numCols] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'}
};

void setup() {
  Serial.begin(9600);
  
  // Initialize the row pins as outputs
  for (int row = 0; row < numRows; row++) {
    pinMode(rowPins[row], OUTPUT);
    digitalWrite(rowPins[row], HIGH); // Set them to HIGH initially
  }
  
  // Initialize the column pins as inputs with pull-up resistors
  for (int col = 0; col < numCols; col++) {
    pinMode(colPins[col], INPUT_PULLUP);
  }
}

void loop() {
  for (int row = 0; row < numRows; row++) {
    // Set the current row to LOW
    digitalWrite(rowPins[row], LOW);
    
    for (int col = 0; col < numCols; col++) {
      // Check if the button in the current column is pressed
      if (digitalRead(colPins[col]) == LOW) {
        char key = keymap[row][col];
        Serial.print("Button Pressed: ");
        Serial.print(key);
        Serial.print(" (Row: ");
        Serial.print(row + 1);
        Serial.print(", Col: ");
        Serial.print(col + 1);
        Serial.println(")");
        delay(200); // Debounce delay
      }
    }
    
    // Set the current row back to HIGH
    digitalWrite(rowPins[row], HIGH);
  }
}