#include <Keypad.h>
const byte satr = 4;
const byte ustun = 4;
char keys[satr][ustun] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'} };
byte ustunPins[ustun] = {5, 4, 3, 2};
byte satrPins[satr] = {9, 8, 7, 6};
Keypad keypad = Keypad(makeKeymap(keys), satrPins, ustunPins, satr, ustun);
void setup ( ) {
Serial.begin(9600);
}
void loop ( ) {
char key = keypad.getKey();
if(key) Serial.println(key); }