#include <WiFi.h>
#include <HTTPClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>

const char* ssid = "Wokwi-GUEST";         
const char* password = ""; 

const char* server = "api.thingspeak.com"; // ThingSpeak server address
const String apiKey = "DUHNI50YWHX1Y102"; // ThingSpeak API Key

const int sensorPin = 4;  // GPIO pin where the temperature sensor is connected

OneWire oneWire(sensorPin);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(115200);
  Serial.println("Connecting to WiFi");

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
}

void loop() {
  float temperature = readTemperature();
  if (!isnan(temperature)) {
    Serial.print("Temperature: ");
    Serial.println(temperature);
    sendToThingSpeak(temperature);
  }
  delay(60000); // Send data every minute
}

float readTemperature() {
  return random(0, 100); // Generate a random temperature value for simulation
}

void sendToThingSpeak(float temperature) {
  HTTPClient http;
  
  String url = "http://" + String(server) + "/update?api_key=" + String(apiKey) + "&field1=" + String(temperature);
  
  http.begin(url);

  int httpResponseCode = http.GET();
  if (httpResponseCode == HTTP_CODE_OK) {
    Serial.println("Data sent to ThingSpeak successfully");
  } else {
    Serial.print("Error sending data to ThingSpeak. HTTP error code: ");
    Serial.println(httpResponseCode);
  }
  
  http.end();
}