Auto Light Energy Saver Pro Kit — Build a Smart Occupancy-Based HVAC Controller with Arduino Uno

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

Slash wasted electricity by automatically cutting off HVAC or lights in unoccupied rooms. This kit teaches you to build a real-world energy-saving system using passive infrared and carbon dioxide sensors to detect human presence, then trigger a relay when a room is empty for 15 minutes. Perfect for homes, classrooms, or office cabins in India's energy-conscious environment.

What You'll Build

A self-contained occupancy-aware controller that monitors a room with a PIR motion sensor and a CO2 sensor to confirm human presence. When both sensors indicate the room is vacant for 15 minutes straight, the relay cuts power to a connected appliance—such as an air conditioner, fan, or light. The OLED display shows real-time CO2 levels, occupancy status, and time since last detection, while the DS3231 RTC ensures accurate timing even without an internet connection. You’ll create a wall-mountable or tabletop unit that can save significant energy over a month.

What You'll Learn

• Integrating PIR motion detection with CO2 readings for reliable occupancy logic
• Programming an Arduino Uno to make relay-based automation decisions using timed variables
• Interfacing I2C peripherals (OLED display and RTC module) on a single bus
• Reading and calibrating an infrared CO2 sensor (MH-Z19B) for indoor air quality
• Soldering protection diodes and pull‑up resistors for robust hardware design

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is built for intermediate learners—CBSE Class 11–12 students exploring sensor-based automation, B.Tech ECE/EEE undergraduates working on mini‑projects, Smart India Hackathon teams prototyping energy solutions, and ATL Tinkering Lab mentors looking for a ready‑to‑assemble demo. If you understand basic Arduino programming and want to tackle real‑world environmental sensing, this project bridges classroom theory and practical energy management.

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.