Keypad

COMPONENTS:
-Arduino Uno
-Keypad

Open Library Manager and install Keypad in there

CODE:
#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[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 customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
void setup(){
  Serial.begin(9600);
}
void loop(){
  char customKey = customKeypad.getKey();
  if (customKey){
    Serial.println(customKey);
  }
}

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