Soil Moisture Sensor Module HD-38 (5 Meters Cable)


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SKU: MYP-JHS-273 Categories: ,

Soil Moisture Sensor Module HD-38 module is designed for precise moisture detection within the soil, enabling accurate monitoring of water content. This module quantifies the volumetric water content present in the soil and provides a measurable output indicative of the moisture level. To cater to diverse data interpretation needs, the module incorporates both digital and analog output options, ensuring compatibility with various applications.

A noteworthy feature of this module is its inclusion of a potentiometer, which grants users the ability to fine-tune a threshold level for moisture detection. This personalized adjustment empowers users to establish a specific moisture level at which they desire the module to trigger certain actions or responses.

The module’s robustness is ensured by the use of a waterproof sensor probe endowed with exceptional corrosion resistance. This design choice guarantees a minimum operational lifespan of six months when deployed in soil environments. The probe’s high resilience ensures reliable performance over extended periods.

Soil Moisture Sensor Module Circuit Diagram

At the core of the moisture sensor module lies the LM393 Comparator IC, which operates as a voltage comparator. Within the module’s circuitry, pin 2 of the LM393 is connected to a 10KΩ potentiometer (preset), while pin 3 is linked to the moisture sensor pin. The comparator IC’s role involves comparing the threshold voltage set via the potentiometer (pin 2) with the voltage originating from the moisture sensor (pin 3).

Moisture Sensor Module

The moisture sensor itself comprises two probes that serve to detect soil moisture. These probes are coated with immersion gold, a protective layer that safeguards the underlying nickel from oxidation. These specialized probes play a crucial role in the moisture-sensing process. By transmitting current through the soil and subsequently measuring the resistance encountered, the sensor extracts valuable moisture data, providing an accurate representation of the soil’s moisture content.


  • Gardening
  • Irrigation Systems
  • Used in Controlled Environments


  • Operating Voltage: 3.3V to 5V DC
  • Operating Current: 15mA
  • Output Digital – 0V to 5V, Adjustable trigger level from preset
  • Output Analog – 0V to 5V based on infrared radiation from fire flame falling on the sensor
  • LEDs indicating output and power
  • Cable sensor – 5 meter
  • PCB Size: 3.2cm x 1.4cm
  • LM393 based design
  • Easy to use with Microcontrollers or even with normal Digital/Analog IC
  • Small, cheap, and easily available


  • This module comes with an unsoldered pin.


  • 1x Soil Moisture Sensor Module
  • 1x Sensor Probes
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