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Smart Door Lock System

Smart door lock: Keyless security for your space.

Author: Nistorescu Maria-Lorena GitHub Project Link*: (https://github.com/LolitaMary/SmartDoorLockSystem)

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Description​

The project is about a smart door lock system using Raspberry Pi Pico W. The door can be unlocked in 3 ways: RFID MODULE, SENSORS( knock knock_ knock knock ), WEB APPLICATION ( turn on/ off). I intend to make a function that sends me back an e-mail which says how many times the door was unlocked in a day. Incredible, right?

Motivation​

Why did I choose this project?

Well, I went in a trip to Italy 2 months ago and I stayed to an airbnb that had a smart door lock system with password.

I knew about the project at school, and at that moment seemed very interesting to me the idea of a digital lock. So I wanted to implement it and, maybe use it every day life.

Architecture​

SDOOR

Log​

Week 6 - 12 May​

In this week, I tried to find more resources regarding to the mobile application I intend to make in order to unlock the door.

Week 7 - 19 May​

In this week, I finally finished the hardware part, including the kicad schematics.

Week 20 - 26 May​

Hardware​

  • Raspberry Pi Pico W (microcontroller): The main control unit for the smart door lock system, responsible for processing data, running the necessary functions, and communicating with other components.

  • RFID MODULE (for unlocking the door): Reads RFID tags/cards to allow authorized access through the smart door lock system.

  • TTP223: Capacitive touch sensor used for touch-based inputs, such as entering a code to unlock the door.

  • 2N2222: NPN transistor that may be used for switching purposes in the circuit, such as controlling the relay module or other components.

  • BUZZER 5V: Emits an audible alert, like a beep or chime, to provide feedback when the door is unlocked or in case of an error.

  • RELAY MODULE: Controls the electronic door lock mechanism, allowing the microcontroller to trigger the locking or unlocking of the door.

  • ELECTRONIC DOOR LOCK: The physical locking mechanism that secures the door, controlled by the relay module based on input from the microcontroller.

  • Power Supply 12V: Supplies the necessary power to the components in the system, ensuring they function properly.

  • Module DC-DC Step Down LM2596S (connected to power supply): Regulates the 12V power supply to provide lower voltage levels required by certain components in the system, such as the Raspberry Pi Pico W.

Schematics​

Shortly, I am going to admit that the KICAD schematics took me with all the coffee breaks included, somewehere around 16-20h :) ; Also, I tried to make the schematics clearer and maybe, help me to notice, if u notice some other mistakes.

Legend of the KICAD schematics: U1 represents the RFID; U2 represents the SENSOR TOUCH; U4 represents the LM5296S; U6 represents the POWER SUPPLY; U7 represents the LOCK; U8 represents the RELAY MODULE;

Q1 is NPN transistor 2N2222.

Bill of Materials​

DeviceUsagePrice

| Rapspberry Pi Pico W | The microcontroller | 35 RON | | Electronic Door Lock 12V | [30,74 RON] | Module RFID RC522,similary with MFRC522| [ 9.99 RON ] | | Buzzer Pasive 5 V| [ 1,40 RON ] | | Coloured wires mom-mom (40p, 30 cm) | [ 6.98RON ] | | Coloured wires father-father (40p, 15 cm) | [ 6.99 RON ] | | Resistor 0.25W 22KΩ | [ 0,10 RON ] | | Transistor NPN 2n2222 TO-92 | [ 0,34 RON] | Module with 4 Relays, Blue | [ 13,88RON] | Breadboard HQ (830 Puncte)| [ 9.98 RON ] | | Cablaj de test 50 x 70 mm | [ 2,49 RON ]| | Button with one touch, TTP223, with pins, 3 V, MulticoloR| IT IS USED FOR UNLOCKING THE DOOR| [18,33 RON] shipping more expensive than the component | | [Module DC-DC Step Down LM2596S]|[13 RON] | [Power Supply]|[16RON]

Software​

LibraryDescriptionUsage
  1. link| The main idea source|
  2. link| RFID DOOR LOCK|
  3. link| DOOR LOCK USING BLYNK APP TUTORIAL|
  4. link| LM2596S tutorial building|

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