Build a CO2 Monitor with Ventilation Alert – Arduino-Based Indoor Air Quality Guard

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

A stuffy classroom or a windowless study room can push carbon dioxide levels past 1,000 ppm, sapping focus and alertness. This kit lets you build a device that continuously monitors CO2, displaying real-time ppm on a crisp OLED screen, and lighting up red-yellow-green LEDs to signal when it’s time to ventilate. It’s a practical, hands-on way to understand air quality and embedded systems.

What You'll Build

You’ll assemble an Arduino-powered indoor CO2 monitor that reads from an MH-Z19B nondispersive infrared (NDIR) sensor, processes data, and drives a color-coded LED strip and an OLED display. When CO2 stays below 800 ppm, a green LED glows. Between 800 and 1,000 ppm, a yellow warning appears. Above 1,000 ppm, red LEDs and a buzzer alert you to open a window—immediately actionable feedback.

What You'll Learn

• Reading PPM data from the MH-Z19B sensor over UART and parsing the serial response
• Driving a 0.96‑inch OLED display using I²C to show live CO₂ readings
• Implementing threshold-based logic to control multicolor LEDs and an active buzzer
• Real‑world calibration of NDIR sensors and interpreting ambient CO₂ fluctuations

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit suits CBSE Class 11–12 students demonstrating environmental monitoring, B.Tech ECE/EEE undergraduates working on semester projects, Smart India Hackathon participants prototyping air quality solutions, and ATL Tinkering Lab innovators exploring sensor integration. It also fits hobbyists curious about IAQ and makers preparing for science exhibitions.

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.