Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (0 and 1)
Detection Area	40mm x 16mm
Comparator Chip	LM393
Sensitivity Adjustment	Potentiometer included
Board Dimensions	62mm x 20mm x 8mm
Mounting Hole Diameter	3.1mm
Interface	3-pin PH2.54 connector
Material	FR-4 PCB with Nickel Plating
Application	Water level monitoring, rain detection, leak alarms

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Reliable water detection

I used three of these in a tank monitoring project. They have been running for two weeks without false positives. The digital output makes interfacing with microcontrollers very simple.

Anonymous

Mar 24, 2026

Rating: 5/5

Perfect for my Arduino rain alarm

This sensor works exactly as described. The sensitivity adjustment via the potentiometer is very responsive, allowing me to fine-tune when the alarm triggers. Great value for the price.

Anonymous

Mar 22, 2026

Rating: 4/5

Works well for leak detection

Placed one under my washing machine. It detects small droplets quickly. The only downside is the connector cable is a bit short, so I had to extend it myself.

Anonymous

Mar 18, 2026

Rating: 4/5

Good quality but needs calibration

The build quality is solid and the soldering points are clean. Just remember to spend time calibrating the threshold; otherwise, it might trigger too easily with humidity alone.

Anonymous

Mar 09, 2026

Rating: 5/5

Excellent sensitivity control

The LM393 comparator does a great job. I can adjust it to ignore minor condensation but still catch actual water accumulation. Very satisfied with this purchase.

Anonymous

Mar 02, 2026

Rating: 5/5

Great for learning projects

Bought this for a university IoT project. It was easy to connect to an ESP32 and the code examples found online worked immediately. Highly recommend for students.

5 FAQ

Q: How do I clean the sensor if it gets dirty or corroded?

A: You can gently wipe the sensing traces with a soft cloth dampened with distilled water or isopropyl alcohol. Avoid using abrasive materials that could scratch the nickel plating.

Q: Does this work with 3.3V logic systems like ESP8266?

A: Yes, the operating voltage range is 3.3V to 5V, making it fully compatible with 3.3V microcontrollers such as the ESP8266, ESP32, and standard 5V Arduinos.

Q: What is the maximum current this module can handle?

A: The module is designed for signal detection, not power switching. The output current should typically remain below 20mA to ensure the longevity of the comparator chip.

Q: Is this sensor waterproof for long-term submersion?

A: The sensing area is designed to detect water, but the electronic components and solder joints on the back are not fully waterproof. For long-term submersion, we recommend conformal coating or placing the electronics in a waterproof enclosure while exposing only the sensor traces.

Q: Can this sensor measure the exact depth of the water in millimeters?

A: No, this module provides a digital switch output (high/low) indicating the presence or absence of water on the sensing traces. It does not provide analog depth measurement data.

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