Hardware Components

• NodeMCU ESP8266
• 3 LEDs (Red, Green, Yellow)
• 3 × 330Ω Resistors
• 1 × Servo Motor (for Lock Mechanism)
• Breadboard & Jumper Wires
• 5V Power Supply

LED Indicator Functions

• 🟡 Yellow LED (WiFi Status)
  • Blinking → WiFi NOT connected
  • Steady ON → WiFi Connected (Ready)
• 🔴 Red LED (Locked)
  • ON → Door is LOCKED
  • OFF → Door is not locked
• 🟢 Green LED (Unlocked)
  • ON → Door is UNLOCKED
  • OFF → Door is not unlocked

Servo Motor Lock Mechanism

• The servo motor is attached to the physical door latch.
• When the app sends a LOCK command, the servo rotates to the lock position.
• When the app sends an UNLOCK command, the servo rotates to the unlock position.
• The servo is powered using a stable 5V supply.

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WiFi Hotspot Setup

• WiFi Name (SSID): DoorLockWifi
  Password: PassW34d2020
  
  • Turn ON the hotspot before powering the NodeMCU.
  • The NodeMCU will automatically connect to this WiFi.

Mobile App Instructions

• 1. Install the APK
  Download and install the APK from the button above.
• 2. Enter Security PIN
  PIN Code: 1234
• 3. Manual Control
  • Tap Lock → Servo locks, Red LED ON
  • Tap Unlock → Servo unlocks, Green LED ON
• 4. Location-Based Control
  Enable Auto Lock/Unlock in Settings.
  Use Update Home Location to save lock location.

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Always verify that the Yellow LED is steady before using the locking system.