Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (0 and 1)
Comparator Chip	LM393 Wide Voltage Comparator
Sensitivity	Adjustable via Potentiometer
PCB Size	3.2cm x 1.4cm
Mounting Hole Diameter	3.0mm
Interface	3-Pin Pinhead (VCC, GND, DO)
Application	Water Level Detection, Rain Alarm, Liquid Leak Detection
Material	FR-4 PCB with Nickel Plated Traces
Package Includes	1x Water Level Sensor Module

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Perfect for my Arduino rain alarm project

This sensor works exactly as described. The sensitivity adjustment is very responsive, allowing me to trigger the alarm only when significant water is present. Great value for the price.

Anonymous

Mar 27, 2026

Rating: 5/5

Easy to integrate

Used this for a university prototype regarding tank level monitoring. The digital output makes it incredibly easy to interface with microcontrollers like ESP32 or Arduino without complex coding.

Anonymous

Mar 16, 2026

Rating: 5/5

Reliable water detection

I have three of these running in my smart garden setup to detect overflow. They have been working continuously for two months without any false positives or corrosion issues so far.

Anonymous

Mar 10, 2026

Rating: 5/5

Great for education

Bought a batch for our robotics club. Students found them very intuitive to work with. The clear labeling on the PCB helps beginners understand pinouts quickly.

Anonymous

Mar 07, 2026

Rating: 4/5

Good module, needs calibration

The build quality is solid. You definitely need to spend a minute adjusting the potentiometer to get the threshold right for your specific use case, but once set, it is reliable.

Anonymous

Mar 04, 2026

Rating: 4/5

Compact and effective

Small footprint makes it easy to hide in enclosures. The only reason for 4 stars instead of 5 is that the soldering points are a bit small for thick wires, but standard jumper wires fit perfectly.

5 FAQ

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

A: This is a signal sensor module, not a power relay. The output pin is designed to send a logic signal to a microcontroller and should not be used to drive high-current loads directly.

Q: How do I adjust the sensitivity of the detection?

A: There is a blue potentiometer on the board. Use a small screwdriver to rotate it clockwise to increase sensitivity or counter-clockwise to decrease it while testing with water droplets.

Q: Does this module provide an analog output for measuring exact water levels?

A: No, this specific module provides a digital switch output (High/Low) indicating the presence or absence of water at the sensor traces. For analog depth measurement, you would need a different type of sensor.

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

A: Yes, the module operates on a wide voltage range of 3.3V to 5V, making it fully compatible with 3.3V logic systems like the ESP8266 and ESP32.

Q: Is the PCB coated to prevent corrosion from long-term water exposure?

A: The board has a standard solder mask and nickel plating which offers basic protection. However, for permanent submersion, we recommend applying an additional conformal coating to extend the lifespan.

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