Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (DO) and Analog Output (AO)
Pin Configuration	4-Wire Interface (VCC, GND, DO, AO)
Probe Material	Gold-Nickel Plated for Corrosion Resistance
PCB Dimensions	32mm x 14mm x 5mm
Probe Length	60mm
Adjustable Sensitivity	Yes, via Blue Potentiometer
Indicator LED	Power LED and Digital Switch Status LED
Compatible Microcontrollers	Arduino, Raspberry Pi, ESP8266, ESP32
Application	Soil Moisture Detection, Automatic Plant Watering Systems

6 reviews

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect for my Arduino greenhouse project

This sensor works flawlessly with my Arduino Uno. The analog output gives a smooth reading of moisture levels, and the digital threshold is easy to adjust with the potentiometer. Build quality feels solid.

Anonymous

Mar 14, 2026

Rating: 4/5

Good value, but needs calibration

Great little module for the price. You do need to spend some time calibrating the potentiometer to get the exact dry/wet point you want, but once set, it's very reliable. The gold plating on the probes is a nice touch.

Anonymous

Mar 14, 2026

Rating: 5/5

Responsive and durable

Been using this in a test bed for three months now. No signs of corrosion on the probes yet. The 4-wire setup makes it versatile for both simple on/off logic and detailed moisture mapping.

Anonymous

Mar 10, 2026

Rating: 5/5

Excellent sensitivity adjustment

The blue potentiometer allows for very precise tuning. I can distinguish between damp and soaking wet soil easily. Works perfectly at 3.3V for my low-power IoT node.

Anonymous

Mar 06, 2026

Rating: 4/5

Solid sensor for beginners

Easy to wire up and plenty of tutorials available online. The only reason I didn't give 5 stars is that the screw terminals could be slightly larger for thicker gauge wires, but it works fine with standard jumper wires.

Anonymous

Mar 06, 2026

Rating: 5/5

Saved my indoor plants!

I connected this to an ESP32 to monitor my potted plants while on vacation. It accurately detected when the soil was dry and triggered my pump. Highly recommend for automated watering systems.

5 FAQ

Q: Can this sensor be used directly with a 3.3V microcontroller like the ESP8266?

A: Yes, the module operates within a 3.3V to 5V range, making it fully compatible with 3.3V logic microcontrollers like the ESP8266 and ESP32 without needing a level shifter.

Q: Are the probes resistant to rust if left in the soil long-term?

A: The probes are gold-nickel plated to significantly reduce corrosion compared to bare steel. However, for permanent long-term installation (months/years), we recommend checking them periodically or using capacitive sensors for maximum longevity.

Q: How do I calibrate the sensitivity for my specific soil type?

A: Insert the probe into dry soil and turn the potentiometer until the DO LED just turns off. Then insert it into wet soil to verify the LED turns on. This sets your custom threshold for that specific soil mixture.

Q: What is the difference between the DO and AO pins?

A: AO (Analog Output) provides a continuous voltage value proportional to the soil moisture level, which you can read with an ADC. DO (Digital Output) acts as a switch; it goes high or low based on a threshold you set using the onboard potentiometer.

Q: Does this module come with screws for the terminal block?

A: Yes, the package includes the sensor module, the probe, and the necessary small screws to secure your wires into the green terminal block.

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