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The Soil Sensor is designed to measure and monitor the nitrogen (N), phosphorus (P), and potassium (K) levels in soil, enabling the optimization of soil fertility and creating ideal conditions for plant growth. With a broad voltage power supply range of 5-30V and data output through the reliable RS485 MODBUS-RTU protocol. It is compatible with the Arduino UNO and TTL to RS485 expansion board for easy setup. Its ability to measure nitrogen, phosphorus, and potassium helps optimize soil fertility, improve plant growth, and enhance yields, making it an essential component for efficient farming, greenhouse cultivation, and hydroponic systems.
Constructed with a high protection level of IP68, the soil sensor is vacuum-sealed with black flame-retardant epoxy resin. The probe is crafted from 316 stainless steel, offering rust-proof, waterproof, and anti-corrosion properties. It also resists salt-alkali corrosion and long-term electrolysis, making it highly durable even in soils with high salt content. Its compact size allows for long-term burial in various soil types without affecting its performance.
Wiring Diagram of soil sensor and Arduino Uno
Probe Material - 316 Stainless Steel
The Soil Sensor finds extensive applications in various soil environment detection scenarios. These include agricultural irrigation, greenhouses, flowers and vegetables cultivation, grassland and pastures, rapid soil testing, plant cultivation, scientific experiments, and grain storage. Its versatility and reliability make it an invaluable tool in modern agriculture and soil science research.
Note: Nitrogen, phosphorus, and potassium sensor data can only be used as a reference and cannot be as accurate as professional instruments.
Nitrogen (N): Nitrogen is a component of organic matter such as proteins, nucleic acids, and amino acids in plants, and plays an important role in plant growth and development. Nitrogen fertilizer can promote the growth of plant leaves, increase the green part of the plant, and improve the efficiency of photosynthesis. Lack of nitrogen will cause yellowing of plant leaves and retarded growth, affecting plant yield and quality.
Phosphorus (P): Phosphorus is a component of important compounds such as DNA, RNA, and ATP in plants, and plays a key role in the energy metabolism, growth, and development of plants. Phosphorus fertilizer can promote plant root development and flower bud differentiation, and increase plant flowering and fruiting. Lack of phosphorus will lead to short root systems and poor flower bud differentiation, affecting plant reproductive growth and yield.
Potassium (K): Potassium is an important ion in plants that regulates osmotic pressure and maintains ion balance. It plays an important role in plants' water balance and nutrient absorption. Potassium fertilizer can promote plant root growth and nutrient transport within the plant, increasing plant stress resistance and yield. Lack of potassium will cause plant leaf margins to scorch, reduce fruit quality, and affect plant growth and yield.
How to install and use the soil sensor
For more detailed insights on selecting the most suitable sensor, refer to the guide on [How to Select the Best Soil Moisture Sensors for Agriculture and Research Lab].
Project: How to Build a DIY Smart Greenhouse (NPK) and Weather Station
Introduction: The IoT agricultural monitoring system, utilizing Unihiker as the main board and various sensors, collects soil nutrients and environmental data. It also includes a weather station for outdoor monitoring. Data is wirelessly uploaded to a local server for real-time analysis, supporting future AI development. The system aids in detecting, controlling, and researching plant growth.
