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

// -------- WiFi Credentials --------
const char* ssid = "Wokwi-GUEST";       // Replace with your WiFi SSID
const char* password = " ";   // Replace with your WiFi Password

// -------- ThingSpeak Setup --------
unsigned long myChannelNumber = 2606501;  // Replace with your ThingSpeak channel number
const char * myWriteAPIKey = "RQ95QN1L9L8F3SEA";          // Replace with your Write API Key

// -------- DHT Sensor Setup --------
#define DHTPIN 2          // D2 pin on ESP32 board
#define DHTTYPE DHT22    // or DHT22 if you are using it
DHT dht(DHTPIN, DHTTYPE);

// -------- WiFi Client --------
WiFiClient client;

void setup() {
  Serial.begin(115200);
  delay(100);

  // Initialize DHT
  dht.begin();

  // Connect WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected.");
  
  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Read data from DHT sensor
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // Default Celsius

  // Check if read failed
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" °C  Humidity: ");
  Serial.print(h);
  Serial.println(" %");

  // Send data to ThingSpeak (Field1 = Temp, Field2 = Humidity)
  ThingSpeak.setField(1, t);
  ThingSpeak.setField(2, h);

  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (x == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }

  // ThingSpeak requires a 15-sec delay minimum
  delay(2000);
}