#include <Keypad.h>

const byte ROWS[] = { 8, 7, 6, 5 };
const byte COLS[] = { 4, 3, 2 };
const byte NUM_ROWS = 4;
const byte NUM_COLS = 3;

const char KEYS[NUM_ROWS][NUM_COLS] = {
  {'9','6','3'},
  {'8','5','2'},
  {'7','4','1'},
  {'*','0','#'}
};

Keypad kpd = Keypad(makeKeymap(KEYS), ROWS, COLS, NUM_ROWS, NUM_COLS);

void setup() {
  Serial.begin(9600);
  for(int x = 0; x < NUM_ROWS; x++) {
    pinMode(ROWS[x], OUTPUT);
    digitalWrite(ROWS[x], LOW);
  }

  for(int x = 0; x < NUM_COLS; x++) {
    pinMode(COLS[x], INPUT_PULLUP);
  }

  Serial.println("Start");
}

void loop() {
 /* char key = readKey();
  if(key) Serial.println(key);
*/
char key = kpd.getKey();
if(key)
{
  switch(key){
  default:
  Serial.println(key);
}
}
}
/*
char readKey() {
  for(int x = 0; x < NUM_ROWS; x++) {
    for(int row = 0; row < NUM_ROWS; row++)
      digitalWrite(ROWS[row], x != row);
    for(int y = 0; y < NUM_COLS; y++) {
      if(!digitalRead(COLS[y])) return KEYS[x][y];
    }
  }
  return 0;
}
*/