Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | 5V DC |
| Sensor Type | Large-Area Rain Drop Detection |
| Output Signal | Digital Switch (DO) and Analog (AO) |
| Relay Contact | Dry-Contact Switch |
| PCB Dimensions | 60mm x 40mm |
| Sensitivity | Adjustable via Potentiometer |
| Indicator LED | Power and Trigger Status |
| Mounting Holes | 4x 3mm Diameter |
| Compatible Platforms | Arduino, Raspberry Pi, ESP32 |
| Application | Water Level Detection, Automatic Wipers, Weather Stations |
Anonymous
Mar 31, 2026
Rating: 4/5
Good sensitivity, easy to adjust
The potentiometer allows for precise tuning of sensitivity. I use it to close my greenhouse windows when it rains. Only minor issue is the soldering pads are a bit small for thick wires.
Anonymous
Mar 28, 2026
Rating: 5/5
Excellent component for automation
We used ten of these for a community garden irrigation system. They have been running for three months without failure. The response time is very fast.
Anonymous
Mar 22, 2026
Rating: 5/5
Great value for education
Bought this for a university robotics project. It's robust, clearly labeled, and the documentation online is helpful. The dry-contact switch feature is exactly what we needed for safety isolation.
Anonymous
Mar 21, 2026
Rating: 4/5
Works as advertised
Simple plug-and-play with 5V logic. The analog output is useful for measuring rain intensity, not just presence. Would recommend adding a conformal coating if using outdoors long-term.
Anonymous
Mar 16, 2026
Rating: 5/5
Reliable water detection
I've tested this in heavy rain and it triggers instantly. The build quality feels solid, and the PCB coating seems to protect the traces well from corrosion over time.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for my weather station project
This sensor works flawlessly with my Arduino setup. The large area detects even light drizzle quickly, and the relay output makes it easy to trigger external devices without extra coding.
Q: Can I use this with a 3.3V microcontroller like ESP8266?
A: Yes, but please note the relay coil requires 5V to activate reliably. You can power the module with 5V and connect the digital output to the 3.3V MCU, as the output is usually compatible, but check your specific logic levels.
Q: What is the maximum current the relay can handle?
A: The onboard relay is typically rated for up to 10A at 250VAC or 30VDC. Please refer to the specific relay model printed on your unit for exact specifications.
Q: Is the sensor sensitive enough to detect mist or fog?
A: The sensitivity is adjustable via the blue potentiometer. While it can detect heavy mist, it is primarily designed for raindrops and standing water. You may need to tune it carefully for fog.
Q: Can this module directly control a 12V water pump?
A: Yes, the onboard relay supports dry-contact switching. You can connect the 12V pump circuit to the relay terminals, while the module itself is powered by 5V.
Q: Does this come with connecting wires?
A: No, the module is sold without jumper wires or cables. You will need to source standard Dupont wires or solder your own connections based on your project needs.
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