arduino 4x4 mebran keypad test

#include <Keypad.h> const byte ROWS = 4; //four rows const byte COLS = 4; //three columns char keys[ROWS][COLS] = { {'1','4','7','*'}, {'2','5','8','0'}, {'3','6','9','#'}, {'A','B','C','D'} }; byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); void setup(){ Serial.begin(9600); //initialise the serial port (9600 baud) } void loop(){ char key = keypad.getKey(); if (key != NO_KEY){ Serial.println(key); //print to serial the key that has been pressed } }