rain-sensor-arduino.ino

/*
 * AJ Alves (aj.alves@zerokol.com)
*/

#define RAIN_ANALOGIC_IN A0 // Arduino's analogic pin
#define RAIN_DIGITAL_IN 4 // Arduino's digital pin
#define BOARD_RESOLUTION 1024 // The analogic board resolution, for example Arduino Uno is 10 bit (from 0 to 1023)

void setup() {
  Serial.begin(9600); // Serial Port setup
  pinMode(RAIN_DIGITAL_IN, INPUT); // Set the digital port as inpput
}

void loop() {
  int rainDigitalVal = digitalRead(RAIN_DIGITAL_IN); // Read the digital data
  int rainAnalogicVal = analogRead(RAIN_ANALOGIC_IN); // Read the analogic data
  
  Serial.println("--------\n");
  
  Serial.print("I am digital, I can tell you only if it rains or not. And now: ");
  if (rainDigitalVal == HIGH) { // HIGH is 1 and LOW is 0
    Serial.println("\tIt is raining!");
  } else {
    Serial.println("\tIt is not raining!");
  }
  
  Serial.print("I am analogic, I can tell you a bit more about the rain. And now: ");
  if (rainAnalogicVal < BOARD_RESOLUTION * 0.1) {
    Serial.println("\tIt is not raining!");
  } else if (rainAnalogicVal < BOARD_RESOLUTION * 0.33) {
    Serial.println("\tIt is raining, but not much!");
  } else if (rainAnalogicVal < BOARD_RESOLUTION * 0.66) {
    Serial.println("\tIt is raining!");
  } else {
    Serial.println("\tIt is raining, may it be a storm!");
  }
  
  delay(1000); // Wait 1 second
}