{"product_id":"soil-moisture-sensor-hygrometer-module-for-arduino","title":"Soil Moisture Sensor \u0026 Hygrometer Module for Arduino","description":"\u003ch5\u003eOverview \u0026amp; Features\u003c\/h5\u003e\n\u003cp\u003eWhether you are designing an automated watering system for your houseplants or developing a large-scale smart agriculture IoT node, the \u003cstrong\u003eArduino Compatible Soil Moisture Sensor (Hygrometer)\u003c\/strong\u003e provides an easy and reliable way to monitor the volumetric water content in soil. This two-part system consists of a fork-shaped conductive probe and a dedicated control board driven by the highly stable LM393 voltage comparator.\u003c\/p\u003e\n\n\u003cp\u003eAvailable at Tomson Electronics, this module measures the electrical resistance of the soil. Dry soil has high resistance, while wet soil has lower resistance. The control board interprets this data and provides dual output modes: a digital output (DO) for a simple high\/low moisture trigger, and an analog output (AO) that allows your microcontroller to track precise, gradual changes in soil dampness over time. The onboard potentiometer allows you to easily calibrate the trigger threshold for different soil types.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e arduino soil moisture sensor, hygrometer module for smart agriculture, automated plant watering detector, iot garden moisture probe, lm393 soil sensor.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch5\u003eTechnical Specifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 3.3V to 5V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComparator Chip:\u003c\/strong\u003e LM393 (Highly stable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Digital Output (DO) and Analog Output (AO)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity Adjustment:\u003c\/strong\u003e Onboard blue potentiometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED Indicators:\u003c\/strong\u003e Power Indicator (Red) and Digital Output Indicator (Green)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Board Dimensions:\u003c\/strong\u003e Approx. 3.2cm × 1.4cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Dimensions:\u003c\/strong\u003e Approx. 6.0cm × 2.0cm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eCommon Applications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomated Irrigation Systems:\u003c\/strong\u003e Triggering water pumps or solenoid valves to automatically water plants only when the soil drops below a specific moisture threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart Agriculture \u0026amp; Greenhouses:\u003c\/strong\u003e Interfacing with Arduino or ESP32 microcontrollers to log environmental data and optimize crop hydration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIoT Smart Gardens:\u003c\/strong\u003e Sending push notifications or emails when your indoor houseplants need watering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEducational Prototyping:\u003c\/strong\u003e Teaching students the basics of analog sensing, thresholds, and closed-loop control systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eFrequently Asked Questions\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between the Analog (AO) and Digital (DO) outputs?\u003c\/strong\u003e\u003cbr\u003e\nA: The Digital Output (DO) acts as a switch, dropping from HIGH to LOW when the soil reaches a specific dampness level (set by the potentiometer). The Analog Output (AO) provides a variable voltage reading that represents the exact moisture level, allowing your microcontroller to determine exactly how dry or wet the soil is on a scale.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I calibrate the sensor for my specific plant?\u003c\/strong\u003e\u003cbr\u003e\nA: Insert the probe into the soil at the ideal moisture level you wish to maintain. Use a small screwdriver to turn the blue potentiometer on the control board until the green Digital Output LED just turns on. Now, whenever the soil gets drier than this set point, the DO pin will trigger your water pump.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will the probe rust over time?\u003c\/strong\u003e\u003cbr\u003e\nA: Because this sensor uses direct electrical current through the soil to measure resistance, the probe will eventually experience galvanic corrosion over time if left powered on continuously in wet soil. To significantly extend its lifespan, program your microcontroller to only send power to the sensor's VCC pin right before taking a reading (e.g., once every hour), rather than leaving it powered 24\/7.\u003c\/p\u003e\n\n\u003ch5\u003ePackage Includes\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Soil Moisture Sensing Probe (Fork Shape)\u003c\/li\u003e\n\u003cli\u003e1 × LM393 Control Board\u003c\/li\u003e\n\u003cli\u003e1 × Set of DuPont Jumper Wires (Female to Female)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Generic","offers":[{"title":"Default Title","offer_id":49517879951598,"sku":"SEN-06599","price":49.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/9029\/files\/SOIL_MOISTURE_SENSOR_HYGROMETER.avif?v=1788173167","url":"https:\/\/www.tomsonelectronics.com\/products\/soil-moisture-sensor-hygrometer-module-for-arduino","provider":"Tomson Electronics ","version":"1.0","type":"link"}