CONNENTION DIAGRAM
KEYPAD CODE
#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] = {2, 3, 4, 5}; //{R1, R2, R3, R4}
byte colPins[COLS] = {6, 7, 8, 9}; //{C1, C2, C3, C4}
Keypad customKeypad = Keypad(makeKeymap(Keys), rowPins, colPins, ROWS, COLS);
void setup()
{
Serial.begin(9600);
}
void loop()
{
char customKey = customKeypad.getKey();
if(customKey)
{
Serial.println(customKey);
}
}