#include <Keypad.h>
const int rows=4;
const int cols=4;
char keys[rows][cols]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
uint8_t colpins[cols]={27,13,22,4};
uint8_t rowpins[rows]={33,25,26,14};

Keypad keypad=Keypad(makeKeymap(keys),rowpins,colpins,rows,cols);

void setup() {
  Serial.begin(1155200);

}

void loop() {
  char key=keypad.getKey();
  Serial.println(key);
  delay(800);
}