// IoT-based Irrigation System for ThingSpeak
// Based on ESP32 WOKWI Simulator by ThinkIOT
// ThingSpeak channel can be found here: https://thingspeak.com/channels/2383114

#include <WiFi.h>
#include "ThingSpeak.h"
#include <DHT.h>

const int SOIL_MOISTURE_PIN = 34;
const int SPRINKLER_CONTROL_PIN = 19;
const int DHT_PIN = 15;

int MOISTURE_THRESHOLD = 85;           // Set Deactivation threshold in percentage
bool SPRINKLER_ACTIVATION_STATUS = false;

char* WIFI_NAME = "Wokwi-GUEST";
char* WIFI_PASSWORD = "";
int myChannelNumber = 2776459;              // ThingSpeak channel ID
char* myApiKey = "KBBDKB7GZOS8JCC9";        // ThingSpeak channel write API key
WiFiClient client;

DHT dht(DHT_PIN, DHT22);

void setup() 
{
  Serial.begin(115200);
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  Serial.println("Connecting...");
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  
  Serial.println("\nWi-Fi connected");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  Serial.println("-------------");
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  pinMode(SPRINKLER_CONTROL_PIN, OUTPUT);
  digitalWrite(SPRINKLER_CONTROL_PIN, LOW);

  dht.begin();

}

void loop()
{
  int soilMoisturePercentage = map(analogRead(SOIL_MOISTURE_PIN), 0, 4095, 0, 100);

  // Read temperature and Humidity from the DHT sensor
  float temperature = dht.readTemperature();   // Read temperature in Celsius
  float humidity = dht.readHumidity();      // Read humidity percentage

  // Check if the moisture level is below the threshold and sprinkler is off
  if (soilMoisturePercentage < MOISTURE_THRESHOLD && !SPRINKLER_ACTIVATION_STATUS)
  {
    SPRINKLER_ACTIVATION_STATUS = true;
    digitalWrite(SPRINKLER_CONTROL_PIN, HIGH);
    Serial.println("Sprinkler turned ON (Low Moisture)"); // Turn on sprinkler
  }
  // Check if the moisture level is above the threshold and sprinkler is on
  else if (soilMoisturePercentage > MOISTURE_THRESHOLD && SPRINKLER_ACTIVATION_STATUS)
  {
    SPRINKLER_ACTIVATION_STATUS = false;
    digitalWrite(SPRINKLER_CONTROL_PIN, LOW);
    Serial.println("Sprinkler turned OFF (High Moisture)"); // Turn off sprinkler
  }

  // Print current soil moisture percentage and sprinkler status
  Serial.print("Soil Moisture Percentage: ");
  Serial.print(soilMoisturePercentage);
  Serial.println("%");

  Serial.print("Temperature:");
  Serial.print(temperature);
  Serial.println("C");

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

  Serial.print("Sprinkler: ");
  Serial.println(SPRINKLER_ACTIVATION_STATUS ? "on" : "off");

  // Send data to ThingSpeak
  ThingSpeak.setField(1, soilMoisturePercentage);
  ThingSpeak.setField(2, SPRINKLER_ACTIVATION_STATUS);
  ThingSpeak.setField(3, temperature);  // Send temperature data to field 3
  ThingSpeak.setField(4, humidity);     // Send humidity data to field 4

  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  
  Serial.println("-------------");

  delay(3000); // Shorten delay to frequently monitor moisture changes
}