Description
Reviews
| 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 |
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.
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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