#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]={5,4,3,2};
uint8_t rowpins[ROWS]={9,8,7,6};


Keypad keypad = Keypad(makeKeymap(keys), rowpins, colpins, ROWS, COLS);
void setup() {
  Serial.begin(9600);

}

void loop() 
{
  char key = keypad.getKey();
  if (key !=NO_KEY){
    Serial.println(key);
  }


}