/* @file HelloKeypad.pde
|| @version 1.0
|| @author Alexander Brevig
|| @contact alexanderbrevig@gmail.com
||
|| @description
|| | Demonstrates the simplest use of the matrix Keypad library.
|| #

 Pins are 8 -> 2
Links: 
-  http://www.addicore.com/v/vspfiles/downloadables/Product%20Downloadables/Project_Interface_Kit/Addicore_12-Key_Keypad_Tutorial.pdf
- https://learn.adafruit.com/biometric-security-box
*/
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'}
};
byte rowPins[ROWS] = {8,7,6,5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {4,3,2}; //connect to the column pinouts of the keypad

// Try this if you think you have reversed the pins
//byte rowPins[ROWS] = {2, 3, 4, 5};
//byte colPins[COLS] = {6, 7, 8}; 

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){
  Serial.begin(9600);
}
  
void loop(){
  char key = keypad.getKey();
  
  if (key){
    Serial.println(key);
  }
}