Office CO2 Tracker Kit with Arduino Uno + DHT22 — Automate Mushroom Fruiting Conditions for Maximum Yield

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

Indoor mushroom cultivation demands precise CO2 and humidity control — a spike of stale air or a dry spell ruins pinning. With this kit, you’ll build a sensor-driven controller that reads real‑time CO2 and humidity from the workplace air, then triggers a humidifier and fan relay exactly when conditions match mushroom fruiting thresholds. It’s a compact, hands‑on system that doubles as an office air quality monitor and a smart‑farming prototype.

What You'll Build

You’ll assemble a standalone module wired on a 400‑pt breadboard. The MH‑Z19B CO2 sensor and DHT22 feed data to an Arduino Uno, which displays humidity and CO2 ppm on the 0.96‑in OLED. Two relay modules — each protected by a 1N4007 flyback diode — switch a humidifier and an exhaust fan when CO₂ exceeds 800 ppm or humidity drops below 85%, the classic fruiting trigger. The logic is easy to tweak for oyster, shiitake, or button mushrooms.

What You'll Learn

• Interface an NDIR CO2 sensor (MH‑Z19B) and a capacitive humidity sensor (DHT22) with Arduino using standard libraries
• Drive inductive loads safely through 5 V relays, selecting flyback diodes and decoupling capacitors to prevent board resets
• Program threshold‑based automation logic that reacts in real time to environmental changes
• Display sensor readings on a graphic OLED, formatting data for quick decision‑making

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11–12 students building investigatory projects on air quality or agriculture; B.Tech ECE/EEE undergraduates prototyping for Smart India Hackathon; ATL Tinkering Lab mentors running environmental‑sensing workshops. IIT, NIT, VIT and BITS students will find the relay‑driving and CO2‑sensor integration directly relevant to their embedded systems coursework.

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.