#include <Keypad.h>
String txt_vaz1 = "      ";
unsigned int vaz1 = 0;
uint8_t cont;

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 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

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

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

void loop() 
{
   for(cont=0;cont<4;  )
  {
    char key = keypad.getKey();
    if (key != NO_KEY) 
    {
      Serial.print(key);
      txt_vaz1[cont] = key;
      cont++;
      //Serial.println(cont);
    }
  }
  Serial.println();
  vaz1 = txt_vaz1.toInt();
  Serial.println(vaz1);
}