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Soil Moisture Sensor Module
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The Soil Moisture Sensor Module is a simple and affordable solution for detecting moisture levels in soil, ideal for building DIY plant watering systems and smart irrigation projects. Designed for makers, students, and IoT developers, it provides reliable analog and digital output for seamless integration with any microcontroller.
The sensor uses a probe with exposed conductive tracks to detect changes in the soil's electrical resistance. When the soil contains more moisture, its conductivity generally increases, allowing the module to detect the change. The onboard LM393 comparator provides a convenient digital output, while the module's dual-output design makes it suitable for projects that need either threshold-based detection or sensor readings through a compatible microcontroller.
With a 3.3V to 5V operating range, this moisture sensor can be used with popular development boards such as Arduino and other microcontroller platforms. The onboard power and output indicators make testing easier, while the mounting hole allows the module to be fixed inside DIY project enclosures or plant-monitoring setups.
For a corrosion-resistant alternative, check out our capacitive soil moisture sensor.
A soil moisture sensor module is an essential component for gardening and IoT-based smart irrigation systems. This moisture sensor works by detecting the water content in soil through electrical resistance. It is widely used in agriculture, home gardening, and automated plant watering systems to ensure optimal plant health.
Also check the Automatic Plant Watering System Kit includes components such as a relay module, mini water pump, plastic battery storage case holder, jumper wires, vinyl tubing, and a soil moisture detector module.
To download the code Click Here
| Feature | Resistive Soil Moisture Sensor | Capacitive Soil Moisture Sensor |
|---|---|---|
| Working Principle | Measures electrical resistance between two exposed conductive probes. | Measures changes in capacitance caused by soil moisture (no exposed corrosion-prone tracks). |
| Corrosion Resistance | Low. Prone to rapid corrosion due to electrolysis when current passes through moist soil. | High. Enclosed design prevents direct contact between soil and conductive material, greatly extending lifespan. |
| Lifespan | Short to Medium (requires power cycling via a relay to delay degradation). | Long (ideal for permanent or long-term plant monitoring setups). |
| Cost | Very Affordable (Best for students and short-term DIY projects). | Slightly higher, but offers better long-term value. |
| Best For | Basic Arduino learning, short-term experiments, and budget-friendly builds. | Long-term plant watering systems, smart irrigation, and professional IoT agriculture. |
Note: The analog values below are based on a standard 10-bit ADC (0–1023) commonly used with Arduino and microcontrollers. The LM393 comparator handles the digital output based on your potentiometer threshold.
| Soil Condition | Expected Analog Value (0-1023) | Digital Output (D0) | Recommended Action |
|---|---|---|---|
| Dry Soil (Air or completely dry potting mix) | 700 – 1023 | HIGH (LED Off) | Trigger water pump/relay to start irrigation. |
| Moist Soil (Ideal watering range) | 300 – 700 | Varies (Based on potentiometer calibration) | Maintain current state; no action needed. |
| Wet / Waterlogged (Submerged in water) | 0 – 300 | LOW (LED On) | Turn off water pump to prevent overwatering and root rot. |
| Sensor Type | Soil Moisture Sensor |
| Operating Voltage (VDC | 3.3 ~ 5 |
| PCB Dimension | 3cm x 1.5cm |
| Soil Probe Dimension | 6cm x 3cm |
| Cable Length (CM) | 20 |
| Weight | 50 grams |
This resistive sensor passes a small current between its two probes. Wet soil conducts better, so the analog output voltage drops as moisture rises. The LM393 board also gives a digital HIGH/LOW output at a threshold you set with the trimpot.
It is very simple to use a Moisture sensor module with a Arduino. Connect the sensor module's Analog/Digital Output pin to the Microcontroller's Analog/Digital pin. Connect the VCC and GND pins to the Microcontroller's 5V and GND pins. Then, insert the probe into the soil.
A built-in potentiometer allows you to calibrate the digital output of the module (DO). You can set a threshold by turning the potentiometer's knob. The Status LED will light up and the module will output LOW when the moisture level exceeds the threshold value. When your plant is ready to be watered, insert the probe into the soil and turn the pot clockwise until the Status LED turns on, then counter-clockwise until the LED turns off to calibrate the sensor. That’s it your sensor is now calibrated and ready for use.
Soil moisture sensors aid in good irrigation management, which results in better crops, lower input costs, and increased profitability. Irrigators can use soil moisture sensors to figure out what's going on in a crop's root zone.
Soil moisture is a crucial factor in agriculture, landscaping, and gardening. The proper amount of soil moisture ensures the optimal growth and health of plants. Traditionally, farmers have relied on manual methods to measure soil moisture levels which can be time-consuming and inaccurate. This is where the benefits of using a soil moisture sensor become apparent for modern-day farmers. These sensors provide accurate real-time data on the water content in soils giving farmers precise information about irrigation needs, allowing them to make informed decisions that ultimately increase crop yield while conserving water usage. Additionally, these sensors save both time and resources by eliminating guesswork and reducing labor costs associated with traditional methods.
Yes. Resistive probes corrode over weeks if powered all the time. Power the sensor from a GPIO pin only when taking a reading, or use a capacitive soil moisture sensor for long-term outdoor use.
Yeah it works good
And thank you ☺️
Soil Moisture Sensor Module
Soil Moisture Sensor Module
I got exactly what was advertised at a good price. This product has the best build quality and sensor response range. I'll continue shopping with Robocraze.
This sensor does exactly what it's supposed to do, and for the price, I think it's worth it. Overall, I'm happy with my purchase.
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It is Amazing and great item in this price
Veri usefull and cheap price from other shopping site, I use this module many project. Thank you robocraze
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