Classroom CO2 Monitor Kit with Arduino Uno + Sensor
Automate Greenhouse CO2 Enrichment with the Arduino CO2 Monitor 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.
Plants thrive when CO2 levels stay between 800–1200 ppm, but in a closed greenhouse, photosynthesis rapidly depletes carbon dioxide, stunting growth. This kit transforms a simple Arduino Uno into a precision CO2 controller. The MH-Z19B sensor continuously measures ambient CO2, displays the reading on a crisp OLED screen, and triggers a relay to open a solenoid valve on a CO2 cylinder—injecting exactly the amount needed to maintain an optimal greenhouse atmosphere. Ideal for school biology-electronics integration or agricultural automation prototypes.
What You'll Build
A standalone sensor-actuator system that reads real-time CO2 concentration in ppm, displays it on a 0.96-inch OLED, and activates a relay output when the level drops below a user-defined threshold. Add the active buzzer for an audible alert, and configure hysteresis in the code to prevent relay chatter. The result is a closed-loop enrichment module ready to connect to any CO2 cylinder solenoid.
What You'll Learn
- Interfacing the MH-Z19B NDIR CO2 sensor via UART with Arduino
- Driving a 5V relay module and protecting the circuit with a flyback diode
- Displaying live sensor data on a monochrome OLED using I2C
- Programming a threshold-based control loop with hysteresis for stable greenhouse automation
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MH-Z19B CO2 Sensor | 1 |
| 5V Relay Module | 1 |
| 0.96in OLED | 1 |
| Active Buzzer | 1 |
| 1N4007 Diode | 5 |
| 10kΩ Resistors | 5 |
| 100nF Capacitors | 5 |
| 400-pt Breadboard | 1 |
| M-M 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
CBSE Class 11-12 students integrating biology and electronics for board practicals or science exhibitions. B.Tech Agriculture Engineering students prototyping sensor-based greenhouse controls. ATL Tinkering Lab mentors running environmental monitoring workshops. Smart India Hackathon teams working on precision agriculture or climate-smart farming solutions. If you need a ready-to-assemble CO2 control demo for a school or college project, this kit fits perfectly.
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?
Our AI companion walks you through each wiring and coding step. If you need more help, message us on WhatsApp—our team responds within a few hours.
Can I use this kit for a school science exhibition?
Yes, the OLED display makes live CO2 ppm visible, and you can demonstrate the relay control with a small LED or solenoid mockup. It's a strong data-driven biology-electronics exhibit.
Does the kit include a CO2 cylinder or solenoid valve?
No. The kit provides the electronics to control a standard solenoid valve. You source the cylinder and valve locally; we include all sensors, actuators, and logic components.
Is the MH-Z19B sensor pre-calibrated for greenhouse use?
The sensor uses automatic baseline calibration. For precision, the build guide explains manual calibration using fresh outdoor air as a 400 ppm reference, suitable for greenhouse environments.
School Ventilation — MH-Z19B CO2 sensor controls relay solenoid on CO2 gas cylinder to enrich greenhouse atmosphere for growth.
What's in this kit
- Arduino Uno R3
- MH-Z19B CO2 Sensor
- 5V Relay Module
- 0.96in OLED
- Active Buzzer
- 1N4007 Diode x5
- 10kΩ Resistors x5
- 100nF Caps x5
- 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