Smart Seed Sprouting with HVAC Performance Monitor Kit (Arduino Uno + DHT22)

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

For Indian gardeners and makers, dry indoor air wreaks havoc on seed germination trays. This kit turns an Arduino Uno and DHT22 sensor into an automatic humidity guardian: when the air drops below your set point, it triggers a relay to activate an ultrasonic mist maker, keeping that tender sprouting environment perfectly moist. No expensive greenhouse controller required.

What You'll Build

A compact bench-top unit with a crisp 0.96-inch OLED display showing live humidity and temperature. The relay output connects to any standard ultrasonic mist module (not included), switching it on when humidity dips below the threshold you program. An active buzzer signals critical lows or faults, and three flyback diodes protect the circuit from relay coil spikes.

What You'll Learn

• Calibrating and reading DHT22 humidity/temperature data with Arduino libraries
• Driving a monochrome OLED via I2C to display real-time sensor values
• Programming threshold-based control logic to toggle a 5V relay
• Adding diode snubbers across inductive loads to prevent microcontroller damage

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11–12 students exploring sensor integration, B.Tech ECE/EEE undergraduates prototyping smart agriculture devices, ATL Tinkering Lab teams building IoT climate controls, and Smart India Hackathon participants needing a reliable humidity-triggered relay module. If you understand basic Arduino sketches and want a project that actually solves a real household problem, this fits squarely in your skill zone.

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.