#include <WiFi.h>
#include <DHTesp.h>
#include <ThingSpeak.h>

WiFiClient client; // WiFi client for ThingSpeak
long myChannelNumber = 2654388; // ThingSpeak channel number
const char *myWriteAPIKey = "D68LUWV0AU05DZ1V"; // ThingSpeak write API key
char ssid[] = "Wokwi-GUEST"; // WiFi SSID
char pass[] = ""; // WiFi password

DHTesp dhtSensor; // DHT sensor object
TempAndHumidity data;

int soil = 34; // Soil moisture sensor pin

void setup() {
  ThingSpeak.begin(client); // Initialize ThingSpeak
  Serial.begin(115200);

  // Initialize DHT sensor
  dhtSensor.setup(21, DHTesp::DHT22);
  pinMode(soil, INPUT);

  // Connect to WiFi
  WiFi.mode(WIFI_STA);
  connectToWiFi();
}

void loop() {
  // Check WiFi connection status
  if (WiFi.status() != WL_CONNECTED) {
    connectToWiFi(); // Reconnect if WiFi is disconnected
  }

  // Read soil moisture
  int soilMoistureValue = analogRead(soil);
  float soilMoisturePercent = map(soilMoistureValue, 0, 4095, 0, 100);

  // Read temperature and humidity
  data = dhtSensor.getTempAndHumidity();
  int humidity = int(data.humidity); // Convert float to integer for sending to ThingSpeak
  int temperature = int(data.temperature);

  // Display sensor values on Serial Monitor
  Serial.print("Soil Moisture: ");
  Serial.print(soilMoisturePercent);
  Serial.println("%");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  // Send data to ThingSpeak
  ThingSpeak.setField(1, humidity);      // Field 1: Humidity
  ThingSpeak.setField(2, temperature);   // Field 2: Temperature
  ThingSpeak.setField(3, soilMoisturePercent); // Field 3: Soil Moisture

  // Write fields to ThingSpeak
  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  // Check for successful channel update
  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.print("Problem Writing data. HTTP error code: ");
    Serial.println(statusCode);
  }

  delay(20000); // Wait for 20 seconds before the next reading
}

void connectToWiFi() {
  Serial.println("Connecting to WiFi...");

  WiFi.begin(ssid, pass); // Start WiFi connection

  while (WiFi.status() != WL_CONNECTED) {
    delay(5000);
    Serial.print(".");
  }

  Serial.println("\nConnected to WiFi");
}