SKU: SENS-0439
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Generic Soil Moisture Sensor Hygrometer Module - Analog/Digital Output

₹33.00 (Inclusive of all taxes)
Out of Stock

This soil moisture sensor module provides both analog and digital outputs for monitoring soil water content, compatible with 3.3V/5V microcontrollers like Arduino, Raspberry Pi, and ESP32. It features a simple two-probe design for measuring volumetric water content via electrical resistance.

Features

  • Dual-mode output: high-precision analog signal and digital trigger via LM393 comparator.
  • Wide operating voltage range from 3.3V to 5V DC for easy integration with common development boards.
  • Includes mounting hole for secure installation and status LEDs for power and digital output.
  • 20cm cable length provides flexible placement for potted plants or garden beds.
  • Simple resistive sensing principle for reliable soil moisture level detection.

Out of stock

Description

This soil moisture hygrometer module operates on the principle of electrical conductivity through soil. The two exposed probes act as a variable resistor; as water content increases, soil conductivity rises, resulting in lower electrical resistance and a correspondingly higher output signal. The integrated LM393 comparator provides a stable digital switching output, while the analog pin delivers a continuous voltage proportional to moisture levels for more nuanced data acquisition.

Designed for durability in damp environments, the module is suitable for direct insertion into soil. Its straightforward interface requires only power, ground, and a single data line, making it ideal for automated irrigation systems, IoT environmental monitoring nodes, and educational projects focused on plant health and smart agriculture.

Key Features

  • Dual Output Interface: Provides both analog (AO) for precise measurement and digital (DO) for threshold-based triggering.
  • LM393 Comparator: Ensures stable and noise-resistant digital signal switching for reliable event detection.
  • Broad Compatibility: Operates from 3.3V to 5V, making it directly usable with Arduino, ESP32, Raspberry Pi (with ADC), and other 5V/3.3V logic systems.
  • Integrated Status Indicators: Features a red power-on LED and a green LED that illuminates when the digital output is triggered.
  • Practical Design: Includes a fixed mounting hole for secure installation and a 20cm cable for flexible sensor placement.
  • Optimized Performance-to-Cost Ratio: A reliable, fundamental sensor for basic soil moisture monitoring applications.

Applications

  • Automated drip irrigation and smart gardening systems for potted plants or small gardens.
  • Environmental monitoring stations and IoT nodes for tracking soil conditions in agricultural research.
  • Educational projects demonstrating sensor integration, analog-to-digital conversion, and basic control logic with Arduino or Raspberry Pi.
  • Plant health monitoring systems to trigger alerts or supplemental watering in greenhouse environments.

Technical Specifications

Item TypeSensor Module
Model NameSoil Moisture Sensor
Operating Voltage3.3V ~ 5V DC
Output SignalsAnalog Output (AO), Digital Output (DO)
Key ComponentLM393 Comparator Chip
Probe Dimensions (approx.)6cm x 3cm
Cable Length20 cm
Indicator LEDsPower (Red), Digital Output (Green)
MountingFixed Bolt Hole

Frequently Asked Questions

What is the operating voltage range for this soil moisture sensor?

The module operates from 3.3V to 5V DC. This range makes it directly compatible with most common development boards like Arduino Uno (5V), ESP32 (3.3V), and Raspberry Pi (using 3.3V logic and an external ADC). Always connect VCC within this specified range to prevent damage.

What is the difference between the AO and DO pins on the sensor?

The AO (Analog Output) pin provides a variable voltage signal that decreases as soil moisture increases, allowing for precise moisture level measurement. The DO (Digital Output) pin, controlled by the onboard LM393 comparator, provides a clean high/low signal based on a preset moisture threshold, useful for simple on/off control in watering systems.

How do I calibrate or set the trigger point for the digital output?

Calibrate the digital trigger by adjusting the blue potentiometer on the module. Insert the probes into soil at your desired moisture threshold (e.g., 'needs water') and turn the potentiometer until the green DO indicator LED changes state. The corresponding DO pin output will switch from high to low (or vice-versa) at this set point.

Can the sensor probes be left in the soil permanently?

While the module can be used for continuous monitoring, prolonged exposure to wet soil may accelerate corrosion on the exposed metal probes. For long-term installations, consider sensors with gold-plated or corrosion-resistant probes, or periodically inspect and clean the contacts to maintain measurement accuracy.

Package Includes

  • 1 x Soil Moisture Sensor Module with Probe

Additional Information

Weight 0.02 kg
Dimensions 6 × 8 × 3 cm