DIY Smart Door Lock — ESP32 + MG995 (Web Control)

Turn your existing door lock into a smart lock without replacing the original lock. This project uses an ESP32 and an MG995 servo to rotate the indoor key/knob, controlled from your phone through a local web page (Open / Close).

Video

Watch the build on YouTube: https://youtu.be/eEBS4yl3FqA

Features

• Open/Close from a local web page
• Two Wi-Fi modes:
  • Access Point (AP): ESP32 creates its own Wi-Fi network
  • Station (STA): ESP32 connects to your home Wi-Fi and is reachable by IP
• 3D-printed mount/case (STL/STEP files included)
• Simple DIY build, easy to customize

Components

• ESP32 DevKit (or ESP8266)
• MG995 Servo Motor
• USB 5V power supply
• Jumper wires + screws
• 3D-printed parts

Wiring (Example)

• Servo Red → ESP32 5V
• Servo Brown/Black → ESP32 GND
• Servo Orange/Yellow → ESP32 GPIO D1

Usage

Access Point (AP)

1. Connect your phone to the ESP32 Wi-Fi network (SSID you set)
2. Open the URL shown in Serial Monitor
3. Use Open / Close

Station (Home Wi-Fi)

1. ESP32 connects to your home Wi-Fi
2. Open the IP address shown in Serial Monitor
3. Use Open / Close

Safety Notes

This is a DIY project for learning and prototyping.

• Add mechanical limits / safe angles to avoid stressing the lock
• Use a stable external power supply for the servo
• Do not treat this as a certified security product