Build an Office Occupancy Tracker with Arduino Uno & CO2 Sensor Kit

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

Transform any office into an energy-efficient smart space. This kit lets you build a sensor system that uses PIR motion and CO2 levels to detect real occupancy, then automatically cuts off HVAC via a relay when nobody's been in the room for 15 minutes. Perfect for corporate offices, co-working spaces, or even your own study room—reduce your electricity bill while learning practical IoT automation.

What You'll Build

You’ll wire up the MH-Z19B CO2 sensor and HC-SR501 PIR to an Arduino Uno, program the logic to avoid false triggers, and connect a relay to switch off the air conditioner or fan. The DS3231 RTC keeps time accurately so the 15-minute vacancy timer works even without internet. A bright 0.96” OLED displays real-time occupancy status, CO2 level, and last movement time.

What You'll Learn

• Interpret CO2 sensor data to gauge human presence in a room
• Program a PIR motion sensor with Arduino and filter false triggers
• Use a real-time clock (DS3231) to track vacancy duration without cloud dependency
• Drive a 5V relay module safely to switch AC appliances (with diode protection)

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for CBSE Class 11–12 students exploring embedded IoT projects, B.Tech ECE/EEE undergraduates looking to prototype a smart building system, and participants in hackathons like Smart India Hackathon. It also fits ATL Tinkering Lab setups for next-level sensor-actuator experiments.

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.