#include <Keypad.h>
const byte ROWS = 4; // four rows
const byte COLS = 4; // four columns
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}; //row pins of the keypad
byte colPins[COLS] = {5,4,3,2}; //col pins of the keypad
Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,ROWS,COLS);
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
char key = keypad.getKey();
if (key != NO_KEY)
{
Serial.println(key);
}
}