Auto Light Energy Saver Kit with Arduino Uno + Relay — Build an Occupancy-Based Smart Switch

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 walking into a hostel room and having the light switch on automatically — then never worrying about forgetting to turn it off. This kit lets you build a PIR sensor–driven Arduino relay controller that eliminates wasteful power consumption. Perfect for Indian classrooms, labs, and energy-conscious homes where fans or lights often run unattended for hours.

What You'll Build

You'll assemble a fully functional occupancy-based light or fan controller. The HC-SR501 PIR sensor constantly watches for motion; the Arduino Uno processes the signal and commands a 5V relay module to switch a high-voltage appliance. After exactly 5 minutes of no movement, the relay de-energizes, ensuring zero standby drain. The circuit includes flyback diodes and runs on a breadboard for easy tweaking and debugging.

What You'll Learn

• Interface a PIR sensor with Arduino and calibrate its sensitivity and time delay
• Program a relay control logic with auto-off timer using non-blocking millis() calls
• Understand flyback diode protection for relay coils and safe 5V-to-mains isolation
• Test and debug on a breadboard, then adapt the concept to real-world energy-saving projects

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for CBSE Class 11-12 students tackling physics or computer science projects, first-year B.Tech ECE/EEE miniprojects, and ATL Tinkering Lab participants. It’s also a strong fit for Smart India Hackathon teams prototyping energy automation and hostel wardens fighting electricity wastage. If you’ve worked with Arduino before and want a practical, measurable automation build — not just theory — you’re ready.

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.