Soil NPK Estimator Kit: Arduino-Powered Nutrient Tester with OLED Display

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

Turn ordinary soil moisture probes into a proxy NPK estimator using electrical conductivity correlations. This kit guides you through wiring, calibration, and programming to display fertiliser recommendations on a crisp OLED screen — an immediate, affordable tool for school agriculture projects or B.Tech mini-projects in precision farming.

What You'll Build

A portable, battery-powered device that reads three moisture sensors inserted into the soil and, after simple on-board processing, shows approximate Nitrogen, Phosphorus, and Potassium levels along with a text-based fertiliser tip (e.g., “Add Urea for N boost”). The OLED shows live readings and suggestions, making soil health checks immediate and meaningful.

What You'll Learn

• Calibrate soil moisture sensors to translate conductivity into relative NPK values
• Program the Arduino Uno to read multiple analog inputs and run estimation logic
• Display dynamic text and custom recommendations on a 0.96-inch OLED via I2C
• Apply temperature compensation using the DS18B20 waterproof probe for more consistent readings

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11–12 students building a physics or agriculture investigatory project will find the conductivity‑based NPK model aligns well with the practical syllabus. First-year B.Tech ECE/EEE students can use this as a mini-project or Smart India Hackathon prototype. ATL Tinkering Labs and IIT, NIT, VIT, BITS workshop participants will appreciate the blend of hardware setup and real-world agricultural application.

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.