Hygrometer Soil & Moisture Sensor Humidity Module

The Hygrometer Soil & Moisture Sensor Humidity Module combines soil-moisture measurement with humidity sensing in one versatile module. By inserting the two soil probe pins into the earth and placing the module in the environment, you can monitor the water content of your plant soil and trigger actions such as watering, alerts, or fan activation based on moisture/humidity thresholds.

The module features both an analog output (AO) for detailed continuous readings and a digital output (DO) which goes HIGH/LOW depending on a preset threshold (adjustable by on-board potentiometer). The integration of humidity measurement helps you monitor ambient or soil-surface humidity, making it ideal for greenhouses, smart planters, hydroponics, and automated garden systems. denontek.com.pk+2Components101+2

Designed for microcontroller platforms like Arduino, Raspberry Pi, or similar, the module typically operates on a 3.3 V to 5 V supply and provides digital/analog interfaces for seamless integration. Monitoring soil moisture prevents over-watering or under-watering, helping optimize plant health, conserve water, and automate garden care. Arduino Project Hub+1

Key Features:

• Dual output: Analog & Digital – AO for continuous value, DO for threshold alert

• Soil-moisture probe (insert into soil) + humidity detection capability

• Operating voltage: typically 3.3 V–5 V DC

• Compact board, easy to mount in pots, planters, greenhouses

• Calibration by on-board potentiometer to set the moisture/humidity trigger

• Compatible with microcontrollers for DIY automation

Technical Specifications (typical):

• Probe board dimensions: ~30 mm ×15 mm (varies)

• Operating voltage: 3.3–5 V DC

• Analog output range: ~0 V (very wet) to ~Vcc (dry soil)

• Digital output: HIGH/LOW depending on threshold setting

• Humidity/soil moisture measurement: resistance-based probes for soil, change in conductivity/resistance with water content

• Interface pins: VCC, GND, AO, DO

• Note: Standard modules use conductivity method; longevity is improved if powered only during measurement. Last Minute Engineers+1

Applications:

• Smart garden planters – automatically water when soil too dry

• Greenhouse environmental monitoring – track soil and air humidity

• Hydroponic systems – trigger pumps/fans based on moisture/humidity

• Educational electronics projects – soil moisture & humidity sensing

• IoT & home-automation – link sensor to cloud or mobile alerts

Precautions & Tips:

• Insert the probe pins fully into the soil for accurate moisture reading.

• In long-term installations, power the probe only during readings to reduce corrosion.

• Calibrate the digital threshold for your specific soil type and watering needs.

• Avoid placing probe in overly mineral-rich water without calibration, because conductivity will vary.

• Keep sensor board and probe connections water-resistant if used outdoors.

Internal Links:

External Links for Reference & Learning:

• Tutorial: “How Soil Moisture Sensor Works and Interface it with Arduino” – LastMinuteEngineers blog. Last Minute Engineers

• Module explanation & pinout: Components101 page “Soil Moisture Sensor Module Pinout” – good to understand AO/DO modes. Components101

• Product listing in Pakistan: “Hygrometer Soil and Moisture Sensor Humidity Module in Pakistan” – gives local pricing and feature overview. Epro

• Internal Links:

• Electronics Components

• Sensors & Modules

• Soil Moisture & Hygrometer Modules

• Arduino and Accessories

• Tools & Accessories

✅ Summary

The Hygrometer Soil & Moisture Sensor Humidity Module is an efficient, low-cost solution for measuring soil water content and humidity with both analog and digital outputs. Ideal for integrating into Arduino-based, IoT, or automated garden systems, it helps you maintain optimal moisture levels, improve plant health, and save water with smart automation.