keypad_test.ino

#include <Keypad.h>

int ledPin = 13;
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
  {
    '1', '2', '3'  }
  ,
  {
    '4', '5', '6'  }
  ,
  {
    '7', '8', '9'  }
  ,
  {
    '*', '0', '#'  }
};
byte rowPins[ROWS] = {
  2, 3, 4, 5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {
  6, 7, 8}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup()
{
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);    // sets the LED off
}

void loop()
{
  char pressedKey = keypad.waitForKey();
  switch (pressedKey) {
  case '*':
    //do shit
    break;
  case '1':
    blink(1);
    break;
  case '2':
    blink(2);
    break;
  case '3':
    blink(3);
    break;
  case '4':
    blink(4);
    break;
  case '5':
    blink(5);
    break;
  case '6':
    blink(6);
    break;
  case '7':
    blink(7);
    break;
  case '8':
    blink(8);
    break;
  case '9':
    blink(9);
    break;
  default:
    //do shit
    break;
  }
}

void blink(int times)
{
  while (times>0)
  {
    delay(250);                  // waits for a second
    digitalWrite(ledPin, HIGH);   // sets the LED on
    delay(500);                  // waits for a second
    digitalWrite(ledPin, LOW);    // sets the LED off
    times--;
  }
}