#include <Keypad.h>
const byte row_count = 4;
const byte column_count = 3;
int red_led=2;
int green_led=3;
byte row_pins[row_count] = {12, 11, 10, 9};
byte column_pins[column_count] = {8, 7, 6 };
char* password = "69420";
int currentposition=0;
char keys4x3[row_count][column_count] = {
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'*', '0', '#'}
};
Keypad myKeypad = Keypad(makeKeymap(keys4x3), row_pins, column_pins, row_count, 
column_count);
void setup() {
 Serial.begin(9600);
 Serial.println("Enter Password: ");
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
}
void loop() {
char code = myKeypad.getKey();
if (code!=NO_KEY)
{
 Serial.print(code);
 Serial.println("");
 if (code == password[currentposition])
 {
 ++currentposition;
#include <Keypad.h>
const byte row_count = 4;
const byte column_count = 3;
int red_led=2;
int green_led=3;
byte row_pins[row_count] = {12, 11, 10, 9};
byte column_pins[column_count] = {8, 7, 6 };
char* password = "69420";
int currentposition=0;
char keys4x3[row_count][column_count] = {
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'*', '0', '#'}
};
Keypad myKeypad = Keypad(makeKeymap(keys4x3), row_pins, column_pins, row_count, 
column_count);
void setup() {
 Serial.begin(9600);
 Serial.println("Enter Password: ");
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
}
void loop() {
char code = myKeypad.getKey();
if (code!=NO_KEY)
{
 Serial.print(code);
 Serial.println("");
 if (code == password[currentposition])
 {
 ++currentposition;
 if(currentposition==5){
 Serial.println("ACCESS GRANTED! :D");
 digitalWrite(green_led, HIGH);
 delay(2000);
 digitalWrite(green_led, LOW);
 }
 }
 else{
 currentposition=0;
 Serial.println("ACCESS DENIED ;(");
 digitalWrite(red_led, HIGH);
 delay(2000);
 digitalWrite(red_led, LOW);
 }
 }
}