Classroom CO2 Monitor Plus Kit with Arduino Uno + Sensor
Classroom CO2 Monitor Plus Kit — Build a Real-Time Ventilation Score with Arduino
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 how you think about indoor air. This kit puts a scientific tool in your hands — a portable, Arduino-powered monitor that reads CO₂, volatile gases, and comfort parameters to generate a single ventilation score. Designed specifically for school environments, it lets you prove when a classroom needs airflow, turning raw sensor numbers into actionable colour-coded advice on a crisp TFT screen.
What You'll Build
A battery-operated air quality station built on a breadboard. It continuously pulls data from an MH-Z19B NDIR CO₂ sensor, an MQ-135 for airborne contaminants, and a DHT22 for temperature and humidity. The Arduino Uno processes those three streams, computes a weighted ventilation index, and renders the results — CO₂ in ppm, gas level as a percentage, thermal comfort, plus a clear “open window” or “air safe” recommendation — on the 1.8″ TFT display. The whole unit runs off a 9 V battery, making it easy to carry from classroom to lab.
What You'll Learn
- How to communicate with an MH-Z19B over UART and retrieve calibrated CO₂ readings
- How to interface the MQ-135 analog gas sensor and apply linearization for real‑world use
- How to read the DHT22’s digital temperature/humidity data using a one‑wire library
- How to drive a 1.8″ ST7735 TFT display and design a multi‑zone dashboard
- How to fuse three disparate sensor inputs into a single, intuitive ventilation score
- How to power a portable circuit from a 9 V battery and manage current budget
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MH-Z19B CO₂ sensor | 1 |
| MQ-135 gas sensor | 1 |
| DHT22 temperature/humidity sensor | 1 |
| 1.8in TFT ST7735 display | 1 |
| 10kΩ resistors | 5 |
| 100nF ceramic capacitors | 10 |
| 400-point breadboard | 1 |
| Male-to-male jumper wires | 25 |
| 9V battery snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
It fits CBSE Class 11–12 students taking up physics or computer science investigatory projects, B.Tech ECE/EEE undergraduates building mini projects, ATL Tinkering Labs focusing on health‑tech themes, and Smart India Hackathon teams prototyping ventilation awareness tools. Whether you study at an IIT, NIT, VIT, BITS, or a local polytechnic, this kit delivers a real, measurable outcome you can showcase.
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.
What if I get stuck during the build?
Open the AI companion from the QR code — it explains every connection, code block, and calibration step. If you still have doubts, drop a WhatsApp message to our support team; they typically reply within a few hours.
Can this monitor be used for a school science exhibition?
Yes, it is designed for portable, battery‑powered demonstration. The TFT display shows live readings and a colour‑coded ventilation recommendation, making it a compelling exhibit for CBSE, ICSE, or state board science fairs.
Does the kit include ready‑to‑upload Arduino code?
The AI companion provides the full Arduino sketch, wiring diagram, and library instructions. You simply copy the code into the Arduino IDE and upload — no blank‑screen guesswork.
Can I log the air quality data over time?
The core kit focuses on real‑time display, but the Arduino Uno’s USB port lets you send serial data to a computer for logging. With a small addition like an SD card module (not included), you can store hours of readings for later analysis.
School Ventilation — MH-Z19B and MQ-135 and DHT22 give composite air quality score on TFT with recommendations.
What's in this kit
- Arduino Uno R3
- MH-Z19B CO2
- MQ-135 Gas Sensor
- DHT22
- 1.8in TFT ST7735
- 10kΩ Resistors x5
- 100nF Caps x10
- 400-pt Breadboard
- M-M Wires x25
- 9V Battery Snap
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items