#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>

// Replace with your network credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// ThingSpeak API key and URL
const char* apiKey = "NSTBS4GHAGRTC6S6";
const char* server = "api.thingspeak.com";

// Analog pins for nutrient levels (N, P, K) and soil moisture
const int nPin = 34; // Analog pin for Nitrogen (N) level
const int pPin = 35; // Analog pin for Phosphorus (P) level
const int kPin = 32; // Analog pin for Potassium (K) level
const int soilMoisturePin = 33; // Analog pin for soil moisture sensor

// DHT sensor pin
const int dhtPin = 2; // Digital pin for DHT sensor

DHT dht(dhtPin, DHT22);

void setup() {
  Serial.begin(115200);
  dht.begin();

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize analog pins
  analogReadResolution(12); // Set ADC resolution to 12 bits
}

void loop() {
  // Read sensor values
  int nValue = analogRead(nPin);
  int pValue = analogRead(pPin);
  int kValue = analogRead(kPin);
  int soilMoistureValue = analogRead(soilMoisturePin);

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Create the URL for ThingSpeak update
  String url = "http://";
  url += server;
  url += "/update?";
  url += "api_key=";
  url += apiKey;
  url += "&field1=";
  url += String(nValue);
  url += "&field2=";
  url += String(pValue);
  url += "&field3=";
  url += String(kValue);
  url += "&field6=";
  url += String(soilMoistureValue);
  url += "&field4=";
  url += String(temperature);
  url += "&field5=";
  url += String(humidity);

  // Send HTTP GET request to ThingSpeak
  HTTPClient http;
  http.begin(url);
  int httpResponseCode = http.GET();
  if (httpResponseCode > 0) {
    Serial.printf("HTTP Response code: %d\n", httpResponseCode);
    Serial.println("Data Uploaded Successfully !!!");
  } else {
    Serial.println("Error sending HTTP request");
  }
  http.end();

  delay(15000); // Send data every 15 seconds
}