Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Signal	Digital Switch (High/Low)
PCB Size	60mm x 20mm
Material	FR-4 Fiberglass with Nickel Plating
Sensitivity	Adjustable via Potentiometer
Indicator	Green Power LED, Red Detection LED
Connector Type	3-Pin PH2.0 Header
Application	Rain Detection, Water Level Monitoring, Leak Alarms
Compatibility	Arduino, Raspberry Pi, ESP32, Micro:bit
Package Includes	1x Sensor Module, 1x Jumper Wire Set

6 reviews

Anonymous

Mar 28, 2026

Rating: 4/5

Good value, needs careful handling

Works exactly as described for our home garden moisture project. The only reason for 4 stars is that the traces can corrode if left in standing water for weeks without drying. For intermittent rain detection, it is flawless.

Anonymous

Mar 26, 2026

Rating: 4/5

Simple but effective

Does one job and does it well. Detects water presence instantly. I wish the connecting wires were a bit longer, but that's a minor issue easily solved with extensions.

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect for Classroom Projects

I bought ten of these for my 8th-grade physics class. They are incredibly easy to interface with Arduino boards. The students successfully built rain alarms in a single period. The sensitivity adjustment is a great teaching point for calibration.

Anonymous

Mar 16, 2026

Rating: 5/5

Great for Science Fair

Used this for my high school science fair project on smart agriculture. It was very easy to code and the LEDs provide clear visual feedback. Highly recommend for beginners learning about sensors.

Anonymous

Mar 09, 2026

Rating: 5/5

Reliable and Sensitive

The potentiometer allows you to fine-tune when the alarm triggers. I set it up to notify me when my basement sump pump activates. It has been running for two months without false positives.

Anonymous

Mar 05, 2026

Rating: 5/5

Sturdy construction

We have used these in outdoor robot prototypes. The PCB coating seems decent for short-term exposure to rain. The digital output makes integration with our microcontrollers very straightforward.

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 should only be connected to a microcontroller input or a low-current indicator. Do not connect it directly to high-power loads like motors or pumps.

Q: Is the output analog or digital?

A: The primary output is digital (HIGH/LOW). However, because it includes an adjustable potentiometer, you can also tap into the comparator circuit to get variable readings if you modify the wiring, though it is designed primarily as a switch.

Q: Does it come with a waterproof casing?

A: No, the module is sold as a bare PCB component intended for DIY integration. You will need to design or purchase a separate enclosure if you plan to install it in a location with heavy direct rainfall.

Q: Can this sensor detect saltwater or just fresh water?

A: This sensor detects conductivity, so it will work with both fresh water and saltwater. However, saltwater may accelerate corrosion on the exposed traces, so we recommend rinsing with fresh water after exposure to saline environments.

Q: How do I adjust the sensitivity?

A: There is a small blue potentiometer on the back of the board. Use a small Phillips screwdriver to turn it clockwise to decrease sensitivity (requires more water) or counter-clockwise to increase sensitivity.

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