Description
Reviews
| 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 |
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.
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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