// Capacitive Moisture Sensor
// XIAO RP2040

const int sensorPin = A0; // Pin zero for the moisture sensor

const int redLED = D1;   // DRY
const int blueLED = D2;  // WET

int moistureValue = 0;

void setup() {

  pinMode(redLED, OUTPUT);
  pinMode(blueLED, OUTPUT);

  Serial.begin(115200);   // baud rate for serial viewer allows text to be readable

}

void loop() {

  // Average 20 readings for stability

  long total = 0;

  for (int i = 0; i < 20; i++) {

    total += analogRead(sensorPin);
    delay(5);

  }

  moistureValue = total / 20;

  // WET

  if (moistureValue < 500) {

    digitalWrite(blueLED, HIGH);
    digitalWrite(redLED, LOW);

    Serial.print("Moisture Value: ");
    Serial.print(moistureValue);
    Serial.println(" --> WET");

  }

  // DRY

  else {

    digitalWrite(blueLED, LOW);
    digitalWrite(redLED, HIGH);

    Serial.print("Moisture Value: ");
    Serial.print(moistureValue);
    Serial.println(" --> DRY");

  }

  delay(700);

}