لوحة الأرقام الغشائية (Membrane Keypad 4x4)

مثال الكود

#include <Keypad.h>
const byte ROWS = 4; const byte COLS = 4;
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 keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup(){ Serial.begin(9600); }
void loop(){
  char key = keypad.getKey();
  if (key){ Serial.println(key); }
}