Smart Security System

info

Author: Khalifa Mohammad
GitHub Project Link: https://github.com/UPB-PMRust-Students/fils-project-2026-khalifamohammad

Description

the project is a smart home security locker system, it activates a PIR Motion sensor whenever it detects motion which then triggers an OLED screen then it requires the user to enter a valid PIN code to open the door in case of 3 wrong attempts the system will activate an Alarm State which is a buzzer starts making sounds and flashing LED lights and ESP32-CAM caputres an image of the person and sends a notification to the server

Motivation

its important to have a secure home and private space, traditional locks provide no feedback or history of attempted breaches, this project fills that gap by creating a smart security system

Architecture

1. Raspberry Pi Pico 2W (Main Controller) The Raspberry Pi Pico 2W acts as the brain of the security system. It is responsible for managing the system state, processing inputs from the keypad and sensors, and controlling the output

2. Motion Sensor

The PIR sensor serves as the system's "wake-up" trigger. It constantly monitors for infrared changes in the environment.

3. OLED Display (I2C)

The OLED screen provides the User Interface for example enter PIN, Wrong PIN, DOOR UNLOCKED and Access Denied

4. 4x4 Matrix Keypad

This is the primary input device for security.

5. Buzzer and LED Array

These components represent the local warning system.

6. ESP32-CAM (Surveillance Node)

The ESP32-CAM functions as an independent imaging component when the third attempt fails it activates.

Log

Week 5 - 11 May

Week 12 - 18 May

Week 19 - 25 May

Hardware

The Raspberry Pi Pico 2W serves as the main hub, handling the PIR motion sensor, 4x4 Keypad, and I2C OLED display.

For the alarm system, an active buzzer and LEDs provide local alerts. A separate ESP32-CAM is used as a dedicated surveillance node; it captures photos upon a security breach and sends them to a remote server via wifi.

Schematics

Bill of Materials

Device	Usage	Price
Raspberry Pi Pico 2W	Central logic controller and system orchestrator	43 RON
ESP32-CAM	Surveillance camera for image capture and notifications	42 RON
OLED Display 0.96" I2C	Visual interface for system status and prompts	20 RON
SG90 Micro Servo Motor	Physical locking mechanism (actuator)	11 RON
PIR HC-SR505	Miniature motion sensor for system wake-up	9 RON
4x4 Matrix Keypad	User input for the security PIN code	7 RON
Active Buzzer	Audible alarm for unauthorized access attempts	3 RON

Software

Library	Description	Usage
embassy-rp	Hardware Abstraction Layer (HAL)	Provides async support for the RP235x (Pico 2) peripherals like GPIO, I2C, and PWM.
embassy-executor	Async Executor	Manages the execution of concurrent tasks, allowing the system to monitor sensors and handle the keypad simultaneously.
embassy-time	Time keeping and Delays	Handles asynchronous timers for the PIR sensor stabilization and OLED screen timeouts.
embassy-sync	Synchronization Primitives	Provides channels and signals to communicate security states between different system tasks.

Links

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