Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Arduino

Product Description The Soil Moisture Sensor Module is an essential tool for monitoring environmental conditions in automated gardening and agricultural research. This hygrometer uses two exposed conductive pads to measure the volumetric water content in soil through resistive sensing. When the soil is dry, the resistance between the probes is high; as moisture levels increase, the resistance drops, allowing more current to pass. The module includes a control board with an onboard LM393 comparator, providing both an Analog output (AO) for precise moisture percentages and a Digital output (DO) for simple "wet/dry" threshold detection. It is the perfect choice for building self-watering systems, smart planters, and IoT-based environmental loggers.

Key Features

• Dual Output Mode: Features an Analog (AO) pin for real-time moisture monitoring and a Digital (DO) pin for direct triggering of relays or buzzers.

• Adjustable Threshold: Includes an onboard blue potentiometer to set the moisture sensitivity level for the Digital output signal.

• Corrosion-Resistant Probe: The sensing fork is treated with an anti-oxidant coating to extend the operational life when buried in damp soil.

• Plug-and-Play Compatibility: Standard 2.54mm pin headers allow for immediate connection to Arduino, Raspberry Pi, or ESP8266 boards.

• Visual Status Indicators: Dual onboard LEDs provide instant feedback: one for Power (red) and one for Digital Switch Output (green).

Technical Details

• Sensing Logic: Operates on the principle of electrical resistance; moisture acts as a bridge, increasing current flow between the two probes.

• Operating Range: Highly effective in varying soil types including loamy, sandy, and clay-based substrates.

• Digital Switching: The LM393 IC provides a clean, stable digital signal (High/Low) based on the user-defined moisture limit.

• Analog Resolution: When used with an Arduino's 10-bit ADC, it provides a reading range from 0 (very wet) to 1023 (very dry).

• Power Efficiency: Low power consumption allows the sensor to be powered directly from a microcontroller's GPIO pin to save energy.

• Interfacing Ease: Connects via a 4-pin header (VCC, GND, DO, AO) using standard jumper wires.

• Thermal Stability: Designed to operate reliably within standard outdoor temperature ranges (-10°C to 50°C).

• Mounting Hole: The control module features a 3mm fixed bolt hole for easy installation into project enclosures.

• Signal Quality: The comparator circuit minimizes signal jitter, providing a debounced digital output for motor control.

• Logic Compatibility: Compatible with 3.3V logic (ESP32/NodeMCU) and 5V logic (Arduino Uno/Mega) systems.

• Pre-soldered Headers: Comes with all headers pre-installed for rapid prototyping without the need for soldering.

• Response Time: Near-instantaneous detection of water presence, ideal for emergency leak detection systems.

• Waterproof Probe Base: The active sensing area is separated from the electronic components to prevent short circuits from surface water.

• Electrode Durability: Thickened trace layers on the probe improve mechanical strength for insertion into hard soil.

• Standardized Form Factor: The compact control board fits easily onto breadboards for testing and calibration.