Smart Parking System Components

Smart Parking System Components

A smart parking system tracks slot occupancy in real time, shows available spaces on a display or web dashboard, and can guide drivers to empty slots. It is a popular final year project because it solves a visible problem and has a clear demonstration scenario. Here is the full component breakdown.

Slot Detection: Sensor Options

IR Sensors (Most Common)

An IR obstacle sensor module (typically based on LM393 comparator, ₹20–40 each) detects whether a vehicle is present in a slot. The IR LED emits, the phototransistor receives — when a car blocks the path, the output goes LOW. Digital output, 3–5V operation.

Limitation: IR sensors work best indoors or covered parking. Direct sunlight saturates the phototransistor and causes false readings. For outdoor parking, use ultrasonic or magnetic sensors.

HC-SR04 Ultrasonic Sensors

Mount above each slot facing down. A reading below ~150 cm means slot is occupied; above means empty. Works in all lighting conditions. More expensive (₹40–70 each) but more reliable outdoors. For a 10-slot parking system, cost for sensors: ₹400–700.

Magnetic / Hall Effect Sensors

Buried under each slot, detects the ferromagnetic mass of a vehicle. Most reliable (works in rain, direct sun, and with any vehicle type) but requires physical installation. Used in professional systems. Overkill for student projects.

Central Controller

For up to 8 slots: A single ESP32 can handle all slot sensors. 8 digital inputs from IR sensors + 1 I2C display + WiFi reporting fits comfortably on one ESP32.

For 10–20 slots: Use an ESP32 as a master with multiple Arduino Nanos as sensor sub-nodes communicating via I2C or UART. Or use an I2C GPIO expander (PCF8574, 8-bit, ₹30–50 each) to extend inputs.

For 20+ slots in a large parking structure: Deploy multiple ESP32 nodes (one per row/section) communicating via MQTT to a central server. This is good final year project architecture — it shows distributed systems design.

Display

Per-slot LED indicators: One green LED (slot empty) and one red LED (slot occupied) above each slot. Simple, universal, immediate. Cost: ~₹10 per slot (LED + resistor). Control via shift registers (74HC595, ₹15 each, 8 outputs per IC) to save GPIO pins.

Entry display: A 16×2 LCD or OLED at the entrance showing total available slots. "Available: 7/10" is the most useful information for a driver entering the lot.

Web dashboard: ESP32 hosts a simple web server showing a visual map of the parking lot with colored slot indicators. Accessible from any phone on the same WiFi network — or serve via internet with a simple MQTT + Node-RED dashboard.

Entry/Exit Gate (Optional Enhancement)

A servo motor (MG996R, ₹180–250) with a boom gate arm provides physical access control. Trigger gate open on valid RFID card (RC522) or automatically on vehicle detection. Track entry/exit counts for accurate availability calculation even if individual slot sensors miss a vehicle.

Complete Component List (10 Slots, Indoor)

• IR obstacle sensor modules × 10 — ₹200–400
• ESP32 DevKit V1 — ₹280–350
• 16×2 I2C LCD (entry display) — ₹80–120
• Green LED × 10 + Red LED × 10 — ₹60
• 74HC595 shift register × 2 — ₹30
• 330Ω resistors × 20 (LED current limiting) — ₹10
• 5V/2A power supply — ₹150–200
• Enclosure and mounting hardware — ₹200–400

Total: ₹1,200–1,800

All components available at Circuitkar with pan-India delivery. The HC-SR04 and IR sensor packs ship together.