Arduino and Keypad Interfacing

Interfacing Keypad with Arduino

Output can be observed in Serial Monitor. 

Library Required: Keypad (By Mark Stanley)

Example Code:

#include <Keypad.h>

const int r = 4; // No. of rows
const int c = 4; // no. of columns

char keys[r][c] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[r] = {9, 8, 7, 6}; // pins to connect with Arduino
byte colPins[c] = {5, 4, 3, 2}; // pins to connect with Arduino

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, r, c );

void setup()
{
Serial.begin();
}
  
void loop(){
  char key = keypad.getKey();// Reading the key
  Serial.print(" You pressed :");
  Serial.println(key);
  delay(10);
}

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