Smart Parking Barrier System (Arduino Project)

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Overview

This project simulates a smart parking entrance barrier using an Arduino board, an infrared obstacle sensor, a servo motor, and LED indicators.

The system mimics a real parking gate:

• Green LED indicates that access is free (no car detected)
• Red LED indicates that a car is detected
• The servo motor controls the barrier position

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Circuit Diagram

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Demonstration Video

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Components Used

• Arduino UNO
• Servo Motor (used as barrier mechanism)
• Infrared Obstacle Sensor (proximity detection)
• 2 LEDs:
  • Green LED (free access)
  • Red LED (car detected)
• Resistors (for LED protection)
• Breadboard
• Jumper wires

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System Behavior

No Obstacle Detected

• Sensor output is HIGH (1)
• Green LED blinks
• Red LED is OFF
• Servo moves to the closed position (barrier down)

Obstacle Detected (Car Present)

• Sensor output is LOW (0)
• Red LED turns ON
• Green LED is OFF
• Servo rotates to open the barrier

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Pin Configuration

Component	Arduino Pin
Infrared Sensor	7
Green LED	2
Red LED	4
Servo Motor	A1

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Code Explanation

Libraries

• Servo.h – used to control the servo motor

Variables

• senzor – input pin for infrared sensor
• verde – green LED pin
• rosu – red LED pin
• rot – state variable to prevent repeated rotation

Functions

setup()

• Initializes pins
• Attaches servo to pin A1
• Sets initial servo position (90 degrees)
• Starts serial communication

Roteste_Dreapta()

• Rotates servo gradually from 0 to 180 degrees
• Simulates opening the barrier
• Runs only once per detection

Roteste_Stanga()

• Moves servo back to closed position (0 degrees)

Aprinde_Verde()

• Blinks green LED to indicate free access

loop()

• Reads sensor continuously
• If obstacle detected:
  • Red LED ON
  • Barrier opens
• If no obstacle:
  • Green LED blinks
  • Barrier closes

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Notes

• Uses infrared obstacle sensor instead of ultrasonic sensor
• Detects objects based on reflected IR light
• Designed and tested in Tinkercad

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Possible Improvements

• Replace IR sensor with ultrasonic sensor for better accuracy
• Add buzzer for sound alerts
• Add LCD display for system status
• Add automatic delay-based closing system

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Author

Maria-Daria Tompea