Here I recommend one from MiniInTheBox Company, a professional company focus on this kind of product.
Brief Introduction of Foliar Rain Raindrops Rainwater Module Arduino Sensor Module Sensitivity Sensor Module
Key FeaturesProduct Use: - Arduino robot kits, rain, rain sensor, can be used to monitor a variety of weather conditions, and turned into several fixed output signal and AO.
- Product description: - 1 the sensor uses a high-quality double-sided FR-04 materials, the large area of ??5.0 * 4.0CM, and nickel-plated surface, effective
- against oxidation, conductivity, superior performance and lifetime areas;
- 2 the comparator output signal clean waveform is good, driving ability, than 15mA;
- 3 power bits adjust the sensitivity;
- 4 Working voltage 3.3V-5V
- 5 the output format: Digital switching output (0 and 1) and analog voltage output AO;
- 6 with bolt holes for easy installation
- 7 a small board PCB size: 3.2cm x 1.4cm
- 8 using a wide voltage LM393 comparator
- Features: - Connect the 5V power supply, power indicator light, sensor board does not drop when, DO output is high, the switch lights off, dripping a drop of water, DO output is low, the switch indicator light,- Brush above water droplets, has returned to the output high state. . . .
... [Full description on MiniInTheBox]


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