This versatile sensor is designed to detect rain, snow, and water with its single-sided, high-conductivity copper plate. Operating in a wide voltage range (3.3V to 5V), it offers both digital (0 or 1) and analog voltage outputs, providing flexibility for various applications. The sensor features adjustable sensitivity through a potentiometer, ensuring optimal performance.

Features:

• Wide Voltage Range: Operates on 3.3V to 5V power supply.
• Digital and Analog Outputs: Provides digital (0 or 1) and analog voltage outputs for versatile applications.
• Adjustable Sensitivity: Fine-tune the sensor's sensitivity using a potentiometer for optimal performance.
• Direct Control of Devices: Capable of driving relays, buzzers, and small fans (up to 100mA) without additional components.
• Easy Installation: Fixed bolt hole and a separate control panel for convenient wiring.
• LED Indicators: Shows power and output status for easy monitoring.
• Large Rain Plate: Increases detection area for enhanced accuracy.
• Compact Size: Small PCB board (3.2cm x 1.4cm) saves space during installation.
• Wide-Voltage Comparator: Utilizes an LM393 comparator for versatile operation.

How it Works:

1. Connect the sensor to a 5V power supply; the power indicator light will turn on.
2. When the rain plate is dry, the DO (digital output) is high, and the LED indicator turns off.
3. Upon contact with a water droplet, the DO goes low, and the LED indicator turns on.
4. Wiping off the water restores the DO to high, turning off the LED again.

Outputs:

Connection Pins:

Package Includes:

• 1 x Rain-sensing board
• 1 x Control board
• 2 x Dupont wires

The biggest part on the control board is the potentiometer to adjust the sensitivity of the rain detector. The potentiometer is only a variable resistor whose resistance is changed with the setting wheel at the top. We need this potentiometer to compare the resistance of the potentiometer with the resistance of the mainboard. If the resistance of the raining board is lower than the threshold, defined by the potentiometer, the digital output of the control board changes from 1 HIGH to 0 LOW.

#define rainAnalog A1
#define rainDigital 2
void setup() {
 Serial.begin(9600);
 pinMode(rainDigital,INPUT);
}
void loop() {
 int rainAnalogVal = analogRead(rainAnalog);
 boolean bIsRaining = !(digitalRead(rainDigital));
 Serial.println(rainAnalogVal);
 delay(200);
}

1. Defining Constants:

• #define rainAnalog A1: This line defines a constant named rainAnalog and assigns it the value A1. A1 likely refers to the analog pin number 1 on your Arduino board.
• #define rainDigital 2: Similarly, this line defines a constant named rainDigital and assigns it the value 2, which probably refers to digital pin number 2.

2. Setting Up:

• void setup(): This function is called once when the Arduino starts up.
  • Serial.begin(9600): This line initializes serial communication with a baud rate of 9600. This means the Arduino can communicate with your computer at a speed of 9600 bits per second.
  • pinMode(rainDigital, INPUT): This configures the pin specified by rainDigital (which is likely pin 2 in this case) as an input pin. This means the Arduino will read the voltage level on that pin from an external sensor.

3. Looping:

• void loop(): This function is called repeatedly after the setup function finishes. This creates a continuous loop where the code inside is executed again and again.
  • int rainAnalogVal = analogRead(rainAnalog): This line reads the voltage level from the analog pin specified by rainAnalog (which is likely pin A1) and stores the value in the integer variable rainAnalogVal.
  • boolean bIsRaining = !(digitalRead(rainDigital)): This line reads the digital state of the pin specified by rainDigital (which is likely pin 2). The ! symbol is a logical NOT operator, so it inverts the value. This means bIsRaining will be true if the pin is low (indicating rain) and false if the pin is high (indicating no rain).
  • Serial.println(rainAnalogVal): This line prints the value of rainAnalogVal (the raw voltage reading) to the serial monitor attached to your computer.
  • delay(200): This line pauses the program for 200 milliseconds before repeating the loop.