Pushbutton 1 and Pushbutton 2 both switch’s terminal 3 are connected to ground through the 1k pulldown resistor for getting stable input. The Pushbutton 1 is used to open (unlock) the door lock and The Pushbutton 2 is used to close (lock) the door lock. ![]() These are used to open and close the door lock from inside the room. This circuit is included two push button switches. The LCD display will show “ DOOR CLOSE” massage and buzzer make a sound for 1 second. When we will press the button “ C” then Arduino sends a command to Servo motor to move the shaft at the 90-degree position, now the door is again locked. Then Arduino sends a command to the Servo motor to move the shaft at the 180-degree position, now the door is unlocked. If the password or pin is matched then the LCD display will show “WELCOME ELECTRODUINO” massage and buzzer make a sound for 1 second. Then Arduino read this password or pin, and match it with the predefined password stored in the Arduino. When we enter a password and submit it using the “ Enter button” in the Keypad module. Here the “Enter button” is Keypad letters “D” and the “Close button” is Keypad letters “C”. Also, define two keypad letters button one is “Enter button” to submit the password or pin code and another one is the “Close button” to lock the Door. Here the predefined Pin code is ” 2306 “. First of all, we must need to have defined a Password or Pin code in the Arduino code. Password-Based Door Lock Security System’s working principle is very simple. Working of Password-Based Door Lock Security System Respectively Digital Pin “D12”, and “D11”Ĭonnected to VIN Pin through a Slide Switch for external DC Power supply to operating Arduino. Push Button 1 and Push Button 2 data pins are the junction point of the both button’s terminal-2 and resistor Respectively Analog Pin “A0”, “A1”, “A2”, “A3”, “A4”, “A5”ġ0k Potentiometer Signal pin, Potentiometer one pin is connected to 5V and another pin is connected to GND(ground) Push Button 1 terminal-3 and Push Button 2 terminal-3īoth are connected to GND (ground) Pin through 1k resistorĤ x 4 Keypad module R1, R2, R3, R4, C1, C2, C3, and C4 Pins Password Based Digital Door Lock Security System Using Arduino & Keypad Circuit Diagram Circuit Wiring Components Pin We need to download the KeyPad library: CLICKĬircuit Diagram of Digital Door Lock Security System Using Arduino, 4×4 Keypad module, and Servo motor The buzzer is used for indications.īlock diagram Component Required Components Name The LCD display is used to show the message to the user. The servo motor is used to push (lock) or pull (unlock) the latch on the door. Open button and close buttons are used to open and close the door lock from inside the room. The 4X4 Keypad module is used to type the password or pin. Here we will use Arduino nano but you can choose any other version of the Arduino board which is based on the ATmega328. ![]() The Arduino is the brain of the project, that controls the whole system. Password-Based Digital Door Lock Security System is consists of Arduino, 4 x 4 keypad module, servo motor, LCD display, and two switches. In this project, we will enter a password using the keypad to open the door lock using servo motor. Which does not allow the user to open the Dore without entering the correct Password or Pincode. This Device is a digital Password or Pin code based Door Lock Security System. For that reason, in this project, we design the Password-Based Digital Door Lock Security System Using Arduino, 4×4 Keypad module, and a Servo motor. So, we need to secure a room at our home and office for protecting our important accessories and documents. Nowadays security is the most important thing.
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