Smart Access Gate System (Arduino)

Automated, sensor-based gate with ultrasonic detection, servo actuation, LEDs, buzzer, and 16x2 I2C LCD. Includes a manual override switch. Built for the Arduino Uno.

This repo is generated directly from the project report and includes the original PDF in docs/. See wiring, code, and testing notes below.

Features

• Ultrasonic vehicle detection (HC-SR04)
• Smooth servo gate control with staged angles
• Visual (LED) and audible (buzzer) alerts
• 16x2 I2C LCD status messages
• Manual override switch for maintenance/emergencies

Hardware

Part	Notes	Pins
HC-SR04 Ultrasonic	VCC 5V, GND	Trig: D9, Echo: D10
Servo	5V supply, GND	Signal: D6
Green LED	220Ω resistor	D7
Red LED	220Ω resistor	D8
Buzzer	Piezo or active buzzer	D13
16x2 I2C LCD	Address usually 0x27	SDA: A4, SCL: A5
Manual Switch	Pull-up enabled	A0 to GND

Setup

1. Install Arduino IDE and add the following libraries if missing:
   • LiquidCrystal_I2C
   • Servo
2. Clone this repo and open src/SmartAccessGate.ino.
3. Wire the components per the table above.
4. Upload to an Arduino Uno.

Behavior

• Opens when object detected within 8 cm, with buzzer + green LED.
• Auto-closes after ~6 seconds of no detection, with buzzer + red LED.
• Manual switch toggles open/close and temporarily disables auto mode.

Directory Layout

smart-access-gate-arduino/
  ├─ src/
  │   └─ SmartAccessGate.ino
  ├─ docs/
  │   └─ PROJECT_REPORT_ON_SMART_ACCESS_GATE_SYSTEM_USING_ARDUINO_UNO.pdf
  ├─ hardware/
  │   ├─ BOM.md
  │   └─ wiring.md
  ├─ .gitignore
  ├─ LICENSE
  └─ README.md

License

MIT. See LICENSE.

Credits

• Based on the project report "PROJECT REPORT ON SMART ACCESS GATE SYSTEM USING ARDUINO UNO" included in docs/.

Demo Video

Watch the demo here: https://youtube.com/shorts/eSR9oMO9okk?feature=share