Rain and snow drop sensor

The Arduino Rain and Snow Drop Sensor is a versatile device that allows you to detect the presence of rain or snow. This sensor is compatible with Arduino boards, making it easy to integrate into your projects. It works by detecting the conductivity of water particles, accurately identifying when rain or snow is falling. The sensor provides reliable and accurate readings, ensuring that you are alerted to any changes in weather conditions. With its compact size and easy installation, the Arduino Rain and Snow Drop Sensor is ideal for a range of applications such as weather monitoring systems, automatic irrigation systems, and smart home projects. Ensure you have all the necessary data for your projects with this reliable and efficient sensor.

Raindrop sensor is basically a board on which nickel is coated in the form of lines. It works on the principal of resistance.

Rain Sensor module allows to measure moisture via analog output pins and it provides a digital output when a threshold of moisture exceeds.

The module is based on the LM393 op amp. It includes the electronics module and a printed circuit board that “collects” the rain drops.  As rain drops are collected on the circuit board, they create paths of parallel resistance that are measured via the op amp.

The sensor is a resistive dipole that shows less resistance when wet and more resistance when dry. When there is no rain drop on board it increases the Resistance so we gets high voltage according to V=IR.

When rain drop present it reduces the resistance because water is a conductor of electricity and presence of water connects nickel lines in parallel so reduces resistance and reduces voltage drop across it.

Specifications

• Adopts high quality of RF-04 double sided material.

• Area: 5cm x 4cm nickel plate on side,

• Anti-oxidation, anti-conductivity, with long use time;

• Comparator output signal clean waveform is good, driving ability, over 15mA;

• Potentiometer adjust the sensitivity;

• Working voltage 5V;

• Output format: Digital switching output (0 and 1) and analog voltage output AO;

• With bolt holes for easy installation;

• Small board PCB size: 3.2cm x 1.4cm;

• Uses a wide voltage LM393 comparator

PinDescriptionVcc+5 Volts Power SourceGNDGround or negative power sourceD0Digital Output. Goes low when moisture exceeds set threshold.A0Analog Output – Zero to five volts. The lower the voltage, the greater the moisturePOWER LEDIndicates that power is appliedOUTPUT LEDIlluminates when moisture has exceeded threshold set by sensitivity adjustment.Sensitivity AdjustmentClockwise is more sensitive. Counterclockwise is less sensitive.