Build a Frost-Warning Soil Temperature Alarm with Arduino Uno & DS18B20

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

Protect your terrace garden or urban farm from surprise frost with a build-it-yourself alarm that senses soil temperature at the root level. On those chilly January mornings when Bengaluru, Pune, or even Delhi temperatures dip near zero, this kit gives you a loud warning before your plants are damaged. You'll wire a waterproof DS18B20 probe, program a threshold on the Arduino, and walk away with a practical gadget that works on a single 9V battery.

What You'll Build

A compact monitoring station that you bury the sensor directly into the soil. The Arduino continuously reads temperature data; when the soil drops below your chosen threshold (e.g., 2°C), a buzzer screams and two red LEDs flash. There's no screen needed—just loud, visible alert that gives you time to cover sensitive plants or move pots indoors. The whole circuit lives on a breadboard, so you can modify it later to send SMS alerts or log data.

What You'll Learn

• Wiring a DS18B20 one-wire sensor and reading precise temperature values
• Programming if-else logic in Arduino to compare real-time temperature against a threshold
• Using a breadboard to prototype a battery-powered monitoring circuit
• Calibrating readings and setting realistic frost alert levels suited for Indian climate zones

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for school students (CBSE Class 5–10) and ATL Tinkering Labs looking for a real-world sensor project. Young makers who love gardening will see immediate use—protecting their plants becomes the motivation to learn electronics. Also a great first kit for B.Tech first-year students exploring Arduino, or urban gardeners who want a custom, budget-conscious frost alarm without buying a readymade device.

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.