// C++ Arduino Code (Copy Below)

#include <Servo.h> 

// --- Pins ---

const int PIN_SENSOR = A0;  // analog from soil moisture sensor

const int PIN_SERVO  = 9;   // servo signal

 

// --- Servo angles (adjust for your mechanism) ---

const int OPEN_ANGLE  = 0;    // cloths uncovered (dry)

const int CLOSE_ANGLE = 90;   // shield position (wet)

 

// --- Calibration ---

// Measure your sensor values first (see notes below).

// Typical modules (varies!): dry≈800–900, wet≈350–500

int DRY_VALUE = 850;   // reading in air / very dry

int WET_VALUE = 450;   // reading when water is on the sensor

 

// Hysteresis to avoid chatter: close when >= 60%, open when <= 45%

const int THRESH_WET   = 60;

const int THRESH_DRY   = 45;

 

// Smoothing and timing

const int SAMPLES = 10;                 // average N samples

const unsigned long COOLDOWN_MS = 800;  // ignore re-triggers for this time

 

Servo cover;

bool isClosed = false;

unsigned long lastMoveMs = 0;

 

int readMoisturePercent() {

  long sum = 0;

  for (int i = 0; i < SAMPLES; i++) {

    sum += analogRead(PIN_SENSOR);

    delay(5);

  }

  int raw = sum / SAMPLES;

 

  // Map raw to 0..100% (0 = dry, 100 = wet)

  int pct = map(raw, DRY_VALUE, WET_VALUE, 0, 100);

  if (pct < 0) pct = 0;

  if (pct > 100) pct = 100;

  return pct;

}

 

void goToAngle(int target) {

  // snap fast; change to a loop for smooth motion if you like

  cover.write(target);

}

 

void setup() {

  cover.attach(PIN_SERVO);

  pinMode(PIN_SENSOR, INPUT);

  goToAngle(OPEN_ANGLE);  // start open

  isClosed = false;

 

  Serial.begin(9600);

}

 

void loop() {

  int moisture = readMoisturePercent();

  unsigned long now = millis();

 

  // Close when wet enough; open again when dry enough (hysteresis)

  if (!isClosed && moisture >= THRESH_WET && (now - lastMoveMs) > COOLDOWN_MS) {

    goToAngle(CLOSE_ANGLE);  // move to 90°

    isClosed = true;

    lastMoveMs = now;

  } else if (isClosed && moisture <= THRESH_DRY && (now - lastMoveMs) > COOLDOWN_MS) {

    goToAngle(OPEN_ANGLE);   // back to 0°

    isClosed = false;

    lastMoveMs = now;

  }

 

  // Debug (optional)

  Serial.print("Moisture: ");

  Serial.print(moisture);

  Serial.println("%");

 

  delay(50);

}