DIY Bluetooth Smart Door Lock with Arduino Uno – Proximity Unlock via HC-05

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Tired of fumbling for keys or typing passwords? This kit lets you build a Bluetooth door lock that automatically unlocks when your phone is nearby and locks when you walk away. By measuring the signal strength (RSSI) between an HC-05 module and your smartphone, the Arduino triggers a relay to control an electric strike or a computer’s lock screen — turning your workshop, lab, or home into a seamless, hands-free secure space.

What You'll Build

With this kit, you’ll assemble a fully functional Bluetooth proximity lock system. Pair your phone once, and the system recognises it by RSSI level. When you approach, a green LED glows and the relay activates — unlocking your door or logging into your computer. Step away, and it locks automatically. You’ll calibrate the distance threshold yourself, learning how wireless signal strength behaves in real environments.

What You'll Learn

• Bluetooth communication and AT command configuration with HC-05
• Using RSSI (Received Signal Strength Indicator) to estimate distance
• Controlling high-voltage devices safely with a relay and flyback diode
• Integrating Arduino logic with physical outputs and LED indicators

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is perfect for CBSE Class 11-12 students exploring IoT and embedded systems, B.Tech ECE/EEE undergraduates working on minor projects, and participants in the Smart India Hackathon. It’s also a great hands-on tool for ATL Tinkering Labs and hobbyist makers from IIT, NIT, VIT, or BITS Pilani who want to move beyond blinking LEDs into practical home automation.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.