#include "DHT.h"

#define DHTPIN 2        // DATA DHT22
#define DHTTYPE DHT22
#define RELAY_PIN 7     // IN реле

#define MOISTURE_THRESHOLD_LOW 30   // включение насоса
#define MOISTURE_THRESHOLD_HIGH 35  // гистерезис
#define PUMP_DURATION 5000          // 5 секунд

DHT dht(DHTPIN, DHTTYPE);

bool pumpState = false;

void setup() {
  Serial.begin(9600);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // реле выключено

  dht.begin();
  Serial.println("Soil Moisture Monitoring Simulation using DHT22");
}

void loop() {
  float humidity = dht.readHumidity();

  if (isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
  }

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  // ===== ЛОГИКА НАСОСА =====
  if (!pumpState && humidity < MOISTURE_THRESHOLD_LOW) {
    Serial.println("Moisture low! Turning pump ON...");
    digitalWrite(RELAY_PIN, HIGH); // включаем реле
    pumpState = true;
    delay(PUMP_DURATION);
    digitalWrite(RELAY_PIN, LOW);  // выключаем реле
    Serial.println("Pump OFF (after 5 sec)");
  }

  // Гистерезис
  if (pumpState && humidity > MOISTURE_THRESHOLD_HIGH) {
    pumpState = false;
    Serial.println("Pump ready for next cycle");
  }

  Serial.println("--------------------------");
  delay(2000);
}