This NPK sensor does not automatically provide accurate readings—it must first be calibrated. To ensure proper use of the NPK storage system, soil samples must be collected and measured using a nationally standardized measuring instrument.
After obtaining accurate nitrogen (N), phosphorus (P), and potassium (K) values, these results must be written into the device using the 485 communication protocol.
Once the calibration data is uploaded, the sensor will begin displaying real-time NPK values. This calibration step is mandatory and must be completed before relying on any measurements from the system.
Features:
Measures NPK Nutrients – Provides nitrogen, phosphorus, and potassium levels in real time.
Wide Voltage Range – Operates on 5V–30V DC, suitable for various power setups.
RS485 MODBUS-RTU Protocol – Ensures reliable and stable data transmission.
Durable Construction – Stainless steel probe with anti-corrosion and waterproof epoxy sealing.
IP68 Protection – Withstands harsh soil and water environments for long-term use.
Fast & Accurate – High precision with ≤5% error margin and 1mg/kg resolution.
Easy Arduino Integration – Works with Arduino UNO R3 + RS485 expansion boards.
Versatile Applications – Agriculture, greenhouse, grassland, research, and soil testing.
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Applications:
Agricultural Irrigation – Optimize soil fertility for better crop yields.
Greenhouse Monitoring – Control nutrient levels for flowers and vegetables.
Research & Education – Soil testing for experiments and academic projects.
Grasslands & Pastures – Monitor soil health for livestock grazing.
Grain Storage & Plant Cultivation – Ensure proper nutrient balance in controlled environments.
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| General Specifications |
| Product Type | Soil NPK Measurement Sensor |
| Power Supply | 5–30V DC |
| Power Consumption | 0.15W @12V |
| Output Mode | RS485 (MODBUS-RTU) |
| Detection Parameters | Nitrogen (N), Phosphorus (P), Potassium (K) |
| Measuring Range | 0–2999 mg/kg (mg/L) |
| Resolution | 1 mg/kg (mg/L) |
| Accuracy | ≤5% |
| Protection Level | IP68 |
| Probe Material | Stainless Steel (anti-corrosion) |
| Sealing Material | Black epoxy resin |
| Working Temperature | 0°C ~ +55°C |
| Cable Length | 2m |
| Size | 123 × 45 × 15 mm |
| Shipment Weight | 0.1650 kg |
| Shipment Dimensions | 42 × 10 × 5 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
PROJECTS
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.
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Wiring Diagram of soil sensor and Arduino Uno
Probe Material - 316 Stainless Steel
How to install and use the soil sensor
Package Includes:
1 x Soil NPK Measure Sensor MODBUS-RTU RS485 (IP68, 5-30V)
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