Classroom CO2 Monitor Kit with Arduino Uno + Relay
Classroom CO2 Monitor Kit with Arduino Uno & Relay – Automate Compost Aeration for School Labs
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
School composting projects often fail when oxygen levels drop, producing foul odours and methane. This kit empowers students to build a real-time monitor that detects anaerobic conditions using CO₂ and temperature data, then triggers a relay to run an agitator motor and aerate the pile automatically. It transforms a passive bin into a self‑regulating system for hands‑on environmental science.
What You'll Build
You'll assemble a permanent monitoring station centred on an Arduino Uno. Two DS18B20 probes measure compost core and ambient temperature, while an MH‑Z19B NDIR sensor reads CO₂ concentration. An OLED display shows live readings and relay status, and a DS3231 RTC timestamps every event. When CO₂ exceeds a preset threshold, the 5V relay activates an external agitator motor to mix the pile and restore aerobic conditions.
What You'll Learn
- Interface an NDIR CO₂ sensor (MH‑Z19B) with Arduino via UART and interpret ppm values
- Read multiple DS18B20 temperature probes on a 1‑Wire bus with parasitic power
- Design a feedback control loop using sensor thresholds to trigger a relay for an AC/DC load
- Solder components on a protoboard to create a durable, field‑deployable monitoring device
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DS18B20 Probe | 2 |
| MH-Z19B CO₂ Sensor | 1 |
| 5V Relay Module | 1 |
| 0.96in OLED Display | 1 |
| DS3231 RTC Module | 1 |
| 1N4007 Diode | 5 |
| 4.7kΩ Resistor | 5 |
| 100nF Capacitor | 10 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 1 |
| Soldering Iron | 1 |
| Solder Wire | 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
Advanced CBSE Class 11–12 students exploring environmental monitoring, B.Tech ECE/EEE final‑year projects on automation, and Smart India Hackathon teams building sustainability prototypes will find every component tailored. It also fits ATL Tinkering Labs where mentors guide soldering and sensor‑feedback programming, preparing students for real‑world instrumentation.
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?
The AI companion walks you through every connection and code block; if you still need a human, our WhatsApp support replies within hours.
Can this monitor be adapted for classroom CO₂ ventilation rather than compost?
Yes, the MH‑Z19B is accurate enough for indoor air quality. You only need to adjust the threshold in the sketch and perhaps reposition the sensor.
Do the probes reach deep enough for a large compost bin?
The DS18B20 probes are 1‑metre digital sensors. You can extend them with shielded cable (not included) and the included 100nF capacitors suppress noise on long runs.
Is soldering mandatory?
Yes, you move from breadboard to a permanent prototype with the included protoboard, soldering iron and solder. The AI companion provides clear, close‑up guides for every joint.
School Ventilation — DS18B20 + CO2 sensor detect anaerobic conditions and trigger relay agitator motor to aerate compost.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
Other projects you can build
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