#include <Keypad.h>
int LED1 = 11;
int LED2 = 12;
int LED3 = 13;

byte rowPins[4]={5,4,3,2};
byte colPins[4]={9,8,7,6};

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

Keypad customkey=Keypad(makeKeymap(keys),rowPins,colPins,4,4);

void setup() {
  Serial.begin(9600);
}

void loop() {
   digitalWrite(11, HIGH);

  
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
  digitalWrite(9, HIGH);
  delay(1000);
char switch_value=customkey.getKey();
if(switch_value){
Serial.println(switch_value);
}
}