#include <Keypad.h>

const byte ROWS = 4;
const byte COLS = 4;

int ledPin12 = 12;

char zapvyp;
 
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]
 = {5, 4, 3, 2};   

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

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

 pinMode(ledPin12, OUTPUT);
}

void loop() {
 char key = klavesnica.getKey();
 if (key) {
   Serial.println(key);
 }
  zapvyp = key;

  if (key == "1"){
    digitalWrite(ledPin12, HIGH);
  }
  if (key == "2") {
    digitalWrite(ledPin12, LOW);
  }
  
 
}