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
Board Dimensions	65mm x 20mm x 8mm
Comparator Chip	LM393
Sensitivity	Adjustable via Potentiometer
Indicator LED	Power and Digital Switch Output
Mounting Hole Diameter	3.0mm
Interface	3-Pin PH2.0 Connector
Application Scope	Water Leak Detection, Rain Sensing, Liquid Level Monitoring

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Compact and effective

Small footprint makes it easy to hide in tight spaces. I installed one under my washing machine to detect leaks. It triggered my smart home notification immediately during a test. Great peace of mind for such a low cost.

Anonymous

Mar 18, 2026

Rating: 5/5

Reliable water detection

I bought five of these for a tank level monitoring system. They are consistent and the digital output makes reading the state very simple without needing complex analog conversion logic. The build quality feels sturdy enough for indoor prototypes.

Anonymous

Mar 15, 2026

Rating: 4/5

Good value, easy to integrate

Great little module for the price. Integration with ESP32 was straightforward. The only reason for 4 stars instead of 5 is that the included pins were not pre-soldered, but that's standard for these types of boards. Highly recommend for beginners.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect for my Arduino rain project

This sensor works exactly as described. The sensitivity adjustment is very responsive, allowing me to fine-tune when the trigger activates. I used it to build a simple rain alarm for my balcony plants, and it has been reliable through several storms.

Anonymous

Mar 07, 2026

Rating: 5/5

Excellent for school projects

Used this for my final year engineering project on smart home safety. It detected water spills instantly. The documentation online is plentiful, which helped me write the code quickly. Very satisfied with the purchase.

Anonymous

Mar 04, 2026

Rating: 4/5

Works well but needs calibration

The sensor is sensitive, perhaps too sensitive out of the box. You definitely need to spend time adjusting the potentiometer to get the right threshold for your specific use case. Once calibrated, it performs flawlessly.

5 FAQ

Q: What microcontroller boards is this compatible with?

A: It is compatible with any microcontroller that supports digital input at 3.3V or 5V logic levels, including Arduino Uno, Nano, Mega, ESP8266, ESP32, and Raspberry Pi (with appropriate voltage leveling if needed).

Q: Does the package include connecting wires?

A: Typically, the package includes the sensor module and a set of male-to-female jumper wires or header pins, depending on the specific SKU selected. Please check the 'What's in the Box' section of your specific order.

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

A: The sensing area is designed to get wet, but the electronic components (chip, resistors, pins) are not waterproof. Long-term submersion may cause corrosion or short circuits. It is best used for splash detection or intermittent contact.

Q: How do I adjust the sensitivity?

A: There is a blue potentiometer on the board. Use a small Phillips screwdriver to turn it clockwise to increase sensitivity (detect less water) or counter-clockwise to decrease sensitivity. Test with small water droplets while monitoring the output LED.

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

A: No, this is a digital switch sensor. It detects the presence or absence of water on the exposed traces. It does not provide an analog reading proportional to water depth.

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