Smart Security System
This project is a smart security system built on the Raspberry Pi Pico 2W by using asynchronous rust programming
Author: Petrescu Alexandra-Maria
GitHub Project Link: https://github.com/UPB-PMRust-Students/fils-project-2026-alexandra.petrescu
Description
My project idea was to try and implement a smart security system logic on a Raspberry Pi Pico 2W, with the help of a PIR sensor for motion detection, an IR sensor, and a buzzer for audio alarms. The entire logic will be written in rust using the Embassy framework to ensure asynchronous execution
Motivation
The main reason why I chose to build this project was because I wanted it to be very interactive, and this idea gave me the perfect way to do it. Besides the coding aspect of it, I wanted to do something that would actually challenge me in terms of hardware and that would ultimately provide immediate and physical feedback, such as waving my hand in front of a sensor and the system actually reacting. Furthermore, I definitely wanted to work with a Raspberry Pi Pico and see for myself the way it performs and can handle a real-world problem.
Architecture
Log
Week 5 - 11 May
Week 12 - 18 May
Week 19 - 25 May
Hardware
- Raspberry Pi Pico 2W: The main microcontroller unit running the asynchronous rust firmware;
- PIR Motion Sensor: Used to detect human movement in the monitored area;
- IR Proximity Snesor: Acts as a secondary close-range trigger, detecting any objects passing directly in front of it;
- Active Buzzer: Provides the loud audible alarm when a security breach is detected;
- Push Button: Allows the user to physically arm or disarm the system;
- Status LED (with a 330OHM resistor): Gives visual feedback on the current state of the alarm(Armed, Disarmed, Triggered);
- Breadboard & Jumper Wires: It will be used for prototyping and connecting all peripherals to the Pico's GPIO pins.
Schematics
Bill of Materials
| Device | Usage | Price |
|---|---|---|
| Raspberry Pi Pico 2W | The microcontroller | 32 RON |
| LCD 1602 with Interface I2C | Displaying information and messages | 14.99 RON |
| Micro Servomotor SG90 90° | Precision mechanical movement | 13.99 RON |
| 5V Passive Buzzer | Generating sounds and audio alerts | 1.40 RON |
| Jumper Wires Female-Male (10p) 10 cm | Connecting components on the breadboard | 2.99 RON |
| Infrared Line Sensor Module | Line detection (line-follower) or obstacle detection | 3.87 RON |
| Jumper Wires Female-Male (10p) 20 cm | Longer connections between modules | 3.99 RON |
| WS2812 8-Bit RGB LED Ring | Bright and colorful visual indicators | 14.99 RON |
| 4x4 Matrix Keypad | Data entry or control code input | 3.99 RON |
| 2.54 mm Male Pin Header | Soldering to the Pico board for breadboard usage | 0.69 RON |
| Jumper Wires Male-Male (10p, 10 cm) | Direct pin connections on the breadboard | 2.85 RON |
| 100K Linear Mono Rotary Potentiometer | Adjusting variable resistance | 7.26 RON |
| SW-520D Vibration Sensor | Detecting tilt, vibration, or physical impact | 4.99 RON |
| HC-SR501 PIR Motion Sensor | Detecting human or animal motion via infrared | 14.49 RON |
Software
| Library | Description | Usage |
|---|---|---|
embassy-rp | Hardware Abstraction Layer & Async runtime | Used for core hardware control on the RP-series chip: GPIO pins (Sensors), PWM (Servo, Buzzer), ADC (Potentiometer), and I2C (LCD). |
embassy-time | Time and scheduling module | Used for adding async delays (Timer::after) and managing non-blocking loop timing for sensor readings. |
smart-leds + ws2812-pio | WS2812 (NeoPixel) LED driver | Used to control the colors and animations of the 8-LED RGB Ring using the Pico's unique Programmable I/O state machines. |
hd44780-driver | External I2C LCD driver | Used to interface with the 1602 LCD via the I2C bus to display text, numbers, and custom characters. |
keypad | Matrix keypad scanning logic | Used to scan the rows and columns of the 4x4 keypad and debounce button presses safely. |
Links
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