Classroom CO2 Monitor Pro Kit with Arduino Uno – Build a Ventilation Alert That Works Automatically

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

Classroom air quality drops fast — 40 students in a closed room can push CO₂ past 2000 ppm in under an hour, leading to drowsiness and poor concentration. This kit lets you assemble a working monitor that displays real‑time CO₂ levels on an OLED screen and automatically switches an exhaust fan via a relay whenever the 1000‑ppm health threshold is crossed. It turns a simple sensor project into a practical solution for any school.

What You'll Build

You will put together a compact unit that reads the MH‑Z19B sensor, processes the data with an Arduino Uno, and shows readings clearly on a 0.96‑inch OLED. The relay output can drive a real fan or a buzzer—so you get a fully functional classroom ventilation alert with zero soldering. The complete circuit fits on the breadboard; the AI companion guides every wire placement.

What You'll Learn

• How to interface the MH‑Z19B NDIR CO₂ sensor with Arduino Uno and interpret its serial output.
• How to drive a 0.96‑inch OLED display to show ppm values and warning icons.
• How to program a 5 V relay module to switch an external load based on a sensor threshold.
• How to design a simple environmental control loop — sense → decide → act — that runs unattended.

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

From a CBSE Class 5 student building a science exhibition model to a B.Tech ECE sophomore looking for a quick sensor‑integration demo, this kit fits anyone curious about indoor air quality. It’s equally useful for ATL Tinkering Labs that need ready‑to‑run projects, Smart India Hackathon prototypes where proof‑of‑concept matters, and hobbyists at IITs, NITs, VIT, or BITS who want to tinker with environmental automation.

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.