Password Based Door Lock System Using Arduino SIMULINO UNO




Security is the main challenging things in this modern world . Any one can enter your private home at any time to stole your property . To protect your home from thief you must be secured . In this project a motor is fitted to the door so that door will open only when password is matched .

By doing this project you will also know concept behind relay . Since relay is mechanical switch between very high voltage controlled by 3 or 5 volt  using npn transistor .

Connect your hardware as shown in circuit diagram above and now upload hex file generated from below code to the arduino uno board .

Password Based Door Lock System Using Arduino SIMULINO UNO (Code)


#include
#include
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(9, 8, 7, 6, 5, 4);
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
{'7','8','9','/'},
{'4','5','6','*'},
{'1','2','3','-'},
{'C','0','=','+'}
};
byte rowPins[ROWS] = {3, 2, 19, 18}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {17, 16, 15, 14}; //connect to the column pinouts of the keypad
//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
const int LED_RED=10; //Red LED
const int LED_GREEN=11; //Green LED
const int RELAY=12; //Lock Relay or motor
char keycount=0;
char code[4]; //Hold pressed keys
//=================================================================
// SETUP
//=================================================================
void setup(){
pinMode(LED_RED,OUTPUT);
pinMode(LED_GREEN,OUTPUT);
pinMode(RELAY,OUTPUT);
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("Password Access:");
lcd.setCursor(0,1); //Move coursor to second Line
// Turn on the cursor
lcd.cursor();
digitalWrite(LED_GREEN,HIGH); //Green LED Off
digitalWrite(LED_RED,LOW); //Red LED On
digitalWrite(RELAY,LOW); //Turn off Relay (Locked)
}
//=================================================================
// LOOP
//=================================================================
void loop(){
char customKey = customKeypad.getKey();
if (customKey && (keycount<4) && (customKey !='=') && (customKey !='C')){
//lcd.print(customKey); //To display entered keys
lcd.print('*'); //Do not display entered keys
code[keycount]=customKey;
keycount++;
}
if(customKey == 'C') //Cancel/Lock Key is pressed clear display and lock
{
Lock(); //Lock and clear display
}
if(customKey == '=') //Check Password and Unlock
{
if((code[0]=='1') && (code[1]=='2') && (code[2]=='3') && (code[3]=='4')) //Match the password
{
digitalWrite(LED_GREEN,LOW); //Green LED Off
digitalWrite(LED_RED,HIGH); //Red LED On
digitalWrite(RELAY,HIGH); //Turn on Relay (Unlocked)
lcd.setCursor(0,1);
lcd.print("Door Open ");
delay(4000); //Keep Door open for 4 Seconds
Lock();
}
else
{
lcd.setCursor(0,1);
lcd.print("Invalid Password"); //Display Error Message
delay(1500); //Message delay
Lock();
}
}
}
//=================================================================
// LOCK and Update Display
//=================================================================
void Lock()
{
lcd.setCursor(0,1);
lcd.print("Door Locked ");
delay(1500);
lcd.setCursor(0,1);
lcd.print(" "); //Clear Password
lcd.setCursor(0,1);
keycount=0;
digitalWrite(LED_GREEN,HIGH); //Green LED Off
digitalWrite(LED_RED,LOW); //Red LED On
digitalWrite(RELAY,LOW); //Turn off Relay (Locked)
}

Password Based Door Lock System Using Arduino SIMULINO UNO (Schematic Diagram)

Password Based Door Lock System Using Arduino SIMULINO UNO schematic diagram




READ  Infinite Loop – Prototype I Final Report: Hazardous Weather Warning System using arduino

The key pad library for the arduino uno available in this link Keypad .This library is setup to do every function for the keypad .

The simulation file for proteus 8  with arduino code can be downloaded from this link proteus simulation with code 

This is very simple project . If you did not understood code please learn first AVR and it will be easy for you to understand arduino codes . you can learn AVR from this link https://www.electronify.org/learn-microcontrolleravr

If you have any question or suggestion please comment below and do not forget to share this project .

 




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  • arduino keypad door lock circuit diagram

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