Automatic soil moisture monitor is an automated online instrument for monitoring soil profile temperature, humidity, and conductivity. It integrates multi-layer sensors and a wireless transmission module, continuously collecting soil moisture data from 0 to 100% and soil temperature data from -30 to 70°C. The device is solar-powered and features a low-power design. Data is uploaded to a cloud platform via a 4G network, making it suitable for agricultural scenarios such as smart greenhouses and orchard irrigation.
Automatic soil moisture monitor is an online monitoring instrument designed based on frequency domain reflectance or time domain reflectance principles. It calculates moisture content by measuring changes in the soil's dielectric constant and can collect three key indicators—soil profile temperature, soil profile humidity, and soil profile conductivity—in real time. The core sensing unit uses a tubular structure, allowing simultaneous measurement of soil parameters at multiple depths within a single soil profile. The monitoring depth is less than 1 meter, and the number of measurement layers can be customized from 3 to 10 layers depending on the model. Each layer can independently output temperature, humidity, and conductivity data.
In terms of technical parameters, the soil temperature measurement range of Automatic soil moisture monitor is -30 to 70℃, with an accuracy of ±0.3℃ and a resolution of 0.01℃ within the -10 to 70℃ range. The soil moisture measurement range is 0 to 100%, with an accuracy of ±3%. For soils with high organic matter or high clay content, the equipment requires specific calibration based on dielectric relaxation characteristics. The soil conductivity measurement range is 0 to 20000 μS/cm, with an accuracy of ±3% within the 0 to 10000 μS/cm range, a full-range accuracy of ±5%, and a resolution of 1 μS/cm. The equipment employs a spiral measuring electrode design, establishing a mathematical model by measuring the soil dielectric constant to calculate soil volumetric water content data.
In terms of hardware, Automatic soil moisture monitor adopts a low-power design, with a sensor power consumption of 0.26W. Equipped with an 8W solar panel and a 5000mAh built-in lithium battery, it can achieve long-term unattended operation in the field without mains power. The sensor housing is made of imported PC material, with an IP67 waterproof rating, capable of withstanding long-term outdoor monitoring environments. Communication utilizes the 485 Modbus RTU protocol, uploading collected data to a cloud server via a 4G or LoRa wireless module. Users can view detailed soil moisture information through a computer client or mobile app.
In agricultural applications, this device can be installed inside smart greenhouses or at designated monitoring points in orchards and farmland. After users set the collection interval through the cloud platform, the device automatically collects and uploads data. The platform generates soil moisture profiles and trend curves, and can preset soil moisture thresholds for automatic drought and flood warnings. When soil moisture content falls below the lower limit or exceeds the upper limit, the system pushes alarm information and simultaneously links with the irrigation system for automated water and fertilizer regulation. The device can connect to the national soil moisture monitoring system, providing continuous and dynamic soil data support for water-saving agricultural irrigation, meteorological and environmental monitoring, greenhouse management, and grassland pastures.
This paper addresses：https://fengtusz.com/company/990.html
