project | Keypad Password-Based Door Lock System | Arduino Project
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Learn how to build a Password-Based Door Lock System using a Keypad and Arduino Mega! This DIY security project uses a 4x4 keypad, servo motor, and Arduino to create a reliable electronic door lock. Ideal for beginners and electronics students, this video covers circuit setup, code explanation, and working demo.
What you'll learn:
Interfacing 4x4 Keypad with Arduino Mega
Controlling a servo motor for locking/unlocking
Setting and changing passwords
How to secure your home or locker using Arduino
Complete wiring and working explanation
Components Used:
Arduino uno
4x4 Matrix Keypad
solenoid lock
16x2 LCD Display
Breadboard & Jumper Wires
Arduino code:
1st compile this code and send it to Arduino
#include EEPROM.h
void setup(){
}
void loop(){
EEPROM.write(0, '3');
EEPROM.write(1, '3');
EEPROM.write(2, '4');
EEPROM.write(3, '4');
}
then compile it and send to Arduino
#include Keypad.h
#include LiquidCrystal.h
#include EEPROM.h
LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);
char d,d1,d2,d3,d10,d11,d12,d13;
int c,cpa;
bool cp,np;
const byte ROWS = 4; //four rows
const byte COLS = 4; //three 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}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {6,7,8,9}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup(){
pinMode(10,OUTPUT);
Serial.begin(9600);
lcd.begin(16, 2);
lcd.display();
lcd.print("ENTER PASSWORD ");
lcd.setCursor(0, 1);
d= EEPROM.read(0);
d1= EEPROM.read(1);
d2= EEPROM.read(2);
d3= EEPROM.read(3);
}
void loop(){
char key = keypad.getKey();
if (key){
c++;
Serial.println(key);
lcd.print("*");
if(c==1){
d10=key;
}
if(c==2){
d11=key;
}
if(c==3){
d12=key;
}
if(c==4){
d13=key;
}
}
if(c==4&np==0){
c=0;
if(d==d10&d1==d11&d2==d12&d3==d13){
if(cp==0){
lcd.setCursor(0, 1);
lcd.print("PASSWORD ACCEPTED");
digitalWrite(10,HIGH);
delay(3000);
digitalWrite(10,LOW);
d10=d11=d12=d13=0;
lcd.setCursor(0, 1);
lcd.print(" ");
lcd.setCursor(0, 1);
}
if(cp==1){
lcd.clear();
lcd.print("NEW PASSWORD");
lcd.setCursor(0, 1);
np=1;
}}else if(d10=='0'&d11=='0'&d12=='0'&d13=='0'){
lcd.clear();
lcd.print("OLD PASSWORD");
lcd.setCursor(0, 1);
cp=1;
}else{
lcd.setCursor(0, 1);
lcd.print("WRONG PASSWORD");
if(cp==1){
cpa++;
}
delay(3000);
d10=d11=d12=d13=0;
lcd.setCursor(0, 1);
lcd.print(" ");
lcd.setCursor(0, 1);
}
}
if(cpa==3){
np=0;
cp=0;
cpa=0;
c=0;
d10=d11=d12=d13=0;
lcd.clear();
lcd.print("ENTER PASSWORD ");
lcd.setCursor(0, 1);
}
if(c==4&np==1){
d=d10;
d1=d11;
d2=d12;
d3=d13;
EEPROM.write(0, d);
EEPROM.write(1, d1);
EEPROM.write(2, d2);
EEPROM.write(3, d3);
np=0;
cp=0;
c=0;
d10=d11=d12=d13=0;
lcd.clear();
lcd.print("ENTER PASSWORD ");
lcd.setCursor(0, 1);
}
}
Power Supply
Perfect for: Arduino beginners, engineering students, DIY lovers, and security system projects.
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