IoT·Jan 1, 2022

Smart Door Lock

Electronic door-lock prototype with keypad/RFID-style access and actuator-controlled locking.

Overview

This access-control project replaces a mechanical lock action with an electronic controller. User input from keypad or RFID-style authentication triggers a servo or solenoid lock actuator. It demonstrates the core of a smart access system: credential input, validation, actuator control, and status feedback.

Specifications

RolePrototype designer and firmware developer

MicrocontrollerArduino / ESP-class controller

SensorsRFID readerKeypad

ModulesServo or solenoid lockBuzzer / status LED

ProtocolsGPIOSPI / UART depending on RFID module

Tech tagsSmart LockRFIDKeypadAccess ControlServo

Architecture

Credential input is processed by the controller. Valid access commands the actuator to unlock for a timed interval and then return to locked state.

Videos

Implementation details

Firmware

Firmware reads keypad/RFID input, checks access credentials, actuates the lock, and gives visual or audio feedback.

Power

Prototype uses low-voltage actuator control; a final door installation would need backup power and mechanical fail-safe design.

Components / BOM

Microcontroller board, Keypad or RFID reader, Servo/solenoid lock, Status LED/buzzer

Engineering challenges

Balancing simple access flow with reliable actuator movement and secure fallback behavior is the key concern.

Solutions

Implemented a straightforward credential-to-actuator control flow suitable for a prototype door lock.

Results & metrics

Demo video shows the door-lock control behavior.

Future improvements

Add encrypted credential storage, mobile unlock, audit logs, battery backup, and a stronger lock mechanism.