#include <Keypad.h>
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
uint8_t colPins[COLS] = {A1,A2,A3,A4};
uint8_t rowPins[ROWS]= {5,4,3,2};
Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,ROWS,COLS);

void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);

}

void loop() {
  char key = keypad.getKey();
  switch (key) {
  case '1':
    digitalWrite(13, HIGH);
    break;
  case '2':
    digitalWrite(12, HIGH);
    break;
  case '3':
    digitalWrite(11, HIGH);
    break;
  case '4':
    digitalWrite(10, HIGH);
    break;
  case '5':
    digitalWrite(9, HIGH);
    break;
  case '6':
    digitalWrite(8, HIGH);
    break;
  case '7':
    digitalWrite(7, HIGH);
    break;
  case '8':
    digitalWrite(6, HIGH);
    break;
  case '0':
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    break;
  }
}