4 x 3 Matrix Array 12 Keys 4*3 Switch Keypad Keyboard Module for Arduino PRO56, R23

DescriptionThis high quality 4×3 Keypad Matrix lets you quickly add controls to your electronics projects. It offers 0-9 numerals, standard star(*) and hash(#) symbols.Features:100% brand new and high quality.12 Button Matrix 0-9 # *Excellent price-performance ratio Easy communication with any microcontrollerGetting started with the 16 4 x 3 Matrix Array 12 Keys 4*3 Switch Keypad Keyboard Module.Step1: Hardware requiredArduino Uno4 x 3 Membrane KeypadStep2: Connecting the HardwareIf you want to test your Keypad this resistor is not necessary.Step3: Upload the Code#include <Keypad.h>const byte ROWS = 4;const byte COLS = 3;char hexaKeys[ROWS][COLS] = {{‘1’, ‘2’, ‘3’},{‘4’, ‘5’, ‘6’},{‘7’, ‘8’, ‘9’},{‘*’, ‘0’, ‘#’}};byte rowPins[ROWS] = {8, 7, 6, 5};byte colPins[COLS] = {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);}}NOTE: If you get stray error the problem is with your “ ” and ‘ characters .Replace them with ordinary quotes “ and’. And you should be fine.