//#include <Keypad.h>
const byte numRows = 6; //number of rows
const byte numCols = 11; //number of columns
const int debounceTime = 100;//20 works better than great !

byte rowPins[numRows] = {A0, A1, A2, A3, A4, A5}; //connect to the row pinouts of the keypad
byte colPins[numCols] = {12, 11, 10, 9, 8 ,7, 6, 5, 4 ,3 ,2}; //connect to the column pinouts of the keypad

void setup()
{
  Serial.begin(9600);
  Serial.println("Starting up");
  for (int row = 0; row < numRows; row++)
  {
    pinMode(rowPins[row],INPUT);       // Set row pins as input
    digitalWrite(rowPins[row],HIGH);   // turn on Pull-ups
  }
  for (int column = 0; column < numCols; column++)
  {
    pinMode(colPins[column],OUTPUT);     // Set column pins as outputs for writing
    digitalWrite(colPins[column],HIGH);  // Make all columns inactive
  }
}

void loop()
{
for(int column = 0; column < numCols; column++)
  {
    digitalWrite(colPins[column],LOW);         // Activate the current column.
    for(int row = 0; row < numRows; row++)     // Scan all rows for a key press
    {
      if(digitalRead(rowPins[row]) == LOW)     // Is a key pressed?
      {
        delay(debounceTime);                   // debounce
        while(digitalRead(rowPins[row]) == LOW);  // wait for key to be released
        Serial.print("H: ");
        Serial.print(row);
        Serial.print(", ");
        Serial.print(column);
        Serial.println("");
        delay(1000);
      }
    }
    digitalWrite(colPins[column],HIGH);     // De-activate the current column.
  }
}