Pi Pico W BLE Proximity Lock – Build a Smart Lock That Recognizes Your Phone

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

Imagine a desk drawer or cabinet that unlocks the moment you walk up to it – no keys, no apps, just your phone in your pocket. With this kit, you’ll program a Raspberry Pi Pico W to constantly scan for your phone’s Bluetooth signal strength, and when that signal exceeds a threshold you set, a 5V relay triggers to unlock the door. It’s a local, privacy-first alternative to cloud-based smart locks, and you build every layer of the logic yourself.

What You'll Build

You’ll build a fully functional proximity-based lock system on a breadboard. A green LED lights when the relay unlatches because your phone is near, and a red LED shows the locked state. The relay can drive an electromagnetic lock, solenoid bolt, or even a small magnetic door contact. Perfect for securing a personal project enclosure, a glass display case, or a hostel cupboard – all without touching your phone.

What You'll Learn

• How to use the Pico W’s Bluetooth LE stack in MicroPython to scan for BLE advertisements and measure RSSI
• Setting a dynamic proximity threshold and debouncing lock/unlock logic to prevent relay chatter
• Wiring and controlling a 5V relay module with back-EMF protection using 1N4007 diodes and status LEDs
• Integrating a breadboard prototype into a real enclosure with power management and safety considerations

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Intermediate makers who have tinkered with a breadboard before. Ideal for CBSE Class 12 students building their final electronics project, B.Tech ECE/EEE students working on IoT prototypes for Smart India Hackathon, or ATL Tinkering Lab mentors seeking a reliable BLE project. Hostel students will love the privacy: a smart lock that needs no Wi‑Fi and uses your phone as the only key.

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.