Garage Parking System

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Smart Garage Door Opener Using Arduino

Smart Garage Door Opener Using Arduino

This project creates an automated garage door system controlled via Bluetooth from your smartphone. The system uses two servo motors to open/close the door, with LED lighting that fades in/out during operation - all housed in a custom 3D printed enclosure.

Garage Door System Front View Internal Components Full System Operation

How the System Works

  • Two SG90 servo motors work in tandem to open/close the garage door
  • HC-05 Bluetooth module enables wireless control from a smartphone app
  • When opening: Servos move 120° in opposite directions (0→120 and 120→0)
  • When closing: Servos reverse their movement with different speed settings
  • LED light fades in gradually when door opens completely
  • LED fades out slowly when door closes (after 5 second delay)
  • 7.4V battery powers the entire system with capacitor for voltage stabilization
  • Full 3D printed enclosure houses all components securely

Materials Required

3D Model Files

Download the 3D printable files for the garage door mechanism and enclosure:

Google Drive

Print these files using JLCPCB's 3D printing service:

Order Now

Smartphone Control App

Download the Android app to control your garage door:

Download APK

Features:

  • Simple connect/disconnect interface
  • Open/Close buttons with status feedback
  • Works with any HC-05 Bluetooth module

Step-by-Step Assembly

1. 3D Printing & Mechanical Assembly:

  • Print all components from the provided 3D files
  • Assemble the garage door mechanism with servo motors
  • Ensure smooth movement before electronics installation

2. Electronics Wiring:

  • Connect servos to Arduino pins 2 and 8
  • Wire HC-05 Bluetooth module (TX→10, RX→9)
  • Connect LED to PWM pin 11
  • Install capacitor across power lines for stabilization
  • Connect 7.4V battery to power the system

3. Software Setup:

  • Upload the provided Arduino code
  • Install the Android control app
  • Pair your smartphone with the HC-05 module

4. Testing & Calibration:

  • Test open/close commands from the app
  • Adjust servo positions if needed for full range
  • Verify LED fading behavior at both open/close states
  • Check battery life and capacitor performance

🎥 Watch the video above for complete assembly and demonstration.

Arduino Code

Upload this code to your Arduino after completing all hardware connections:

#include <SoftwareSerial.h> // TX RX software library for bluetooth
#include <Servo.h> // servo library 

Servo myservo1; // servo on pin 8 (will move 120→0 when opening)
Servo myservo2; // servo on pin 2 (will move 0→120 when opening)

int bluetoothTx = 10; // bluetooth tx to 10 pin
int bluetoothRx = 9; // bluetooth rx to 9 pin
int LED = 11; // LED on PWM pin 11 for fading

SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);

void setup()
{
  myservo1.attach(8); // attach first servo to pin 8
  myservo2.attach(2); // attach second servo to pin 2
  pinMode(LED, OUTPUT);
  Serial.begin(9600); // Setup usb serial connection to computer
  bluetooth.begin(9600); // Setup Bluetooth serial connection to android
  myservo1.write(120); // Set pin 8 servo to 120 initially (opposite position)
  myservo2.write(0);   // Set pin 2 servo to 0 initially
}

void loop()
{ 
  // Read from bluetooth and write to usb serial
  if(bluetooth.available()) // receive number from bluetooth
  {
    int command = bluetooth.read(); // save the received command
    
    // Open gate command (0)
    if(command == 0)
    {
      Serial.println("Opening gate");
      
      // Move servos in opposite directions simultaneously
      for(int pos = 0; pos <= 120; pos += 1)
      {
        myservo1.write(120 - pos); // pin 8: 120→0
        myservo2.write(pos);       // pin 2: 0→120
        delay(50); // Opening speed
      }
      
      // Only after gate is fully opened, fade in LED
      for(int brightness = 0; brightness <= 255; brightness +=5) {
        analogWrite(LED, brightness);
        delay(40); // Fade-in speed
      }
    }
   
    // Close gate command (120)
    if(command == 120)
    {
      Serial.println("Closing gate");
      
      // Move servos in opposite directions simultaneously
      for(int pos = 120; pos >= 0; pos -= 1)
      {
        myservo1.write(120 - pos); // pin 8: 0→120
        myservo2.write(pos);       // pin 2: 120→0
        delay(80); // Closing speed
      }
      
      // Wait 5 seconds after gate is fully closed
      delay(5000);
      
      // Then fade out LED
      for(int brightness = 255; brightness >= 0; brightness -=5) {
        analogWrite(LED, brightness);
        delay(40); // Fade-out speed
      }
    }
  }
}

Code Explanation:

Setup:

Initializes two servo motors (pins 2 and 8), Bluetooth communication (pins 9-10), and LED (pin 11). Sets initial servo positions.

Loop:

Listens for Bluetooth commands. On '0' command: Opens door (servos move opposite directions) then fades in LED. On '120' command: Closes door (with slower speed), waits 5 seconds, then fades out LED.

Why Choose This Design?

  • ✅ Wireless Control: Bluetooth operation from your smartphone
  • ⚡ Energy Efficient: Only activates when needed
  • 🔄 Smooth Operation: Coordinated servo movement with adjustable speeds
  • 💡 Smart Lighting: Automatic LED fading enhances visibility
  • 🛠️ Stable Power: Capacitor ensures consistent voltage to servos
  • 🖨️ Custom Enclosure: Professional 3D printed housing

Safety Features

  • 5-second delay before LED fade-out prevents sudden darkness
  • Different opening/closing speeds for better control
  • Capacitor protects against voltage spikes
  • Physical stops in 3D design prevent servo over-rotation

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