Soil NPK Sensor 3-in-1 Probe – Smart Agriculture Solution

The Soil NPK Sensor 3-in-1 is designed for real-time measurement of the three essential macronutrients required for healthy plant growth: Nitrogen (N), Phosphorus (P), and Potassium (K). Accurate detection of NPK levels enables precision farming, optimized fertilization, and increased crop yield.

With its compact probe design and easy-to-read analog/digital outputs, this sensor integrates seamlessly with Arduino, NodeMcu, ESP32, and Raspberry Pi for building IoT-enabled smart agriculture systems, greenhouse monitoring, and hydroponic farms.

By monitoring nutrient levels, farmers, researchers, and hobbyists can prevent over-fertilization, reduce costs, and maintain soil health, ensuring sustainable and efficient crop production.

✨ Key Features

• Measures Nitrogen (N), Phosphorus (P), Potassium (K)

• Dual output: analog and digital for flexible integration

• Compact 3-in-1 probe design for soil insertion

• Real-time soil nutrient detection

• Compatible with Arduino, NodeMcu, ESP32, Raspberry Pi (ADC required)

• Suitable for smart agriculture, hydroponics, and research projects

• Easy installation and calibration

🔧 Technical Specifications

🛠 Applications & Use Cases

Smart Agriculture & Precision Farming

• Soil nutrient monitoring

• Fertilizer optimization and automation

• Crop health management

Hydroponics & Greenhouse Systems

• Monitor nutrient levels in soil or medium

• Control fertigation systems

• Optimize plant growth conditions

DIY & Educational Projects

• Arduino soil nutrient projects

• IoT smart farming dashboards

• Soil research and experimentation

⚙ Usage & Wiring Guide

1. Insert the probe into soil for direct contact with root zone.

2. Connect VCC to 3.3–5V, GND to ground.

3. Connect analog/digital outputs to microcontroller (A0 for Arduino).

4. Read voltage to determine N, P, K levels based on calibration.

5. Optionally integrate with IoT dashboards for real-time monitoring.

Recommended internal links:

• Arduino Boards: https://electroway.org/product-category/arduino-and-accessories/arduino-boards/

• NodeMcu Modules: https://electroway.org/product-category/iot-and-smart-solutions/iot-modules/nodemcu/

• Electronics Components: https://electroway.org/product-category/electronics-components/

⚠ Precautions

• Avoid immersing electronics module in water; only the probe should contact soil.

• Keep probe clean for accurate readings.

• Calibrate sensor before use for precise measurements.

• Avoid using in highly acidic or corrosive soil environments.

• Use proper voltage supply to prevent damage.

🎥 YouTube Tutorial Link

Watch Video:https://www.youtube.com/shorts/JzSSKkYe380

4. Product Summary

The Soil NPK Sensor 3-in-1 Probe is an essential tool for smart agriculture, hydroponics, and precision farming, providing real-time measurement of Nitrogen, Phosphorus, and Potassium levels. Its compact probe design, dual outputs, and compatibility with Arduino, ESP32, NodeMcu, and Raspberry Pi make it ideal for IoT-based soil monitoring and automation projects.