4x4 Keypad

Membrane Keypad 4x4 Matrix

Arduino Pins | Keypad Pins

13 | 5
12 | 6
11 | 7
10 | 8
9   | 1
8   | 2
7   | 3
6   | 4

#include <Keypad.h>

const byte ROWS = 4; // Four rows
const byte COLS = 4; // Three columns

// Define the Keymap
char keys[ROWS][COLS] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'#','0','*', 'D'}
};

byte rowPins[ROWS] = { 9, 8, 7, 6 };
byte colPins[COLS] = { 13, 12, 11, 10 }; 

// Create the Keypad
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  char key = kpd.getKey();
  if(key)  // Check for a valid key.
  {
    Serial.println(key);
  }
}