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

// WiFi credentials
const char *ssid = "Wokwi-GUEST";
const char *password = "";

// ThingSpeak API key and channel ID
const char *apiKey = "7XBVCDI0PI6266G3";
const long channelID = 2410153; // Replace with your ThingSpeak channel ID

// Pin for LM35 Temperature Sensor
const int temperatureSensorPin = 35;  // Analog pin for LM35 Temperature Sensor

// Pins for LED and Buzzer
const int ledPin = 13;       // Digital pin for LED
const int buzzerPin = 12;    // Digital pin for Buzzer

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

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

  // Set up pins
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Read analog value from the LM35 temperature sensor
  int temperatureValue = analogRead(temperatureSensorPin);

  // Convert the temperature value to degrees Celsius
  float voltage = (temperatureValue / 4095.0) * 3300.0; // LM35 linearly scales 10mV per degree Celsius
  float temperatureCelsius = voltage / 10.0;

  // Print values to the serial monitor
  Serial.print("Temperature (C): ");
  Serial.println(temperatureCelsius);

  // If temperature is above a certain threshold, send data to ThingSpeak and activate LED and buzzer
  if (temperatureCelsius > 25.0) { // Adjust the threshold based on your specific conditions

    // Send data to ThingSpeak
    int status = ThingSpeak.writeField(channelID, 1, temperatureCelsius, apiKey);

    // Check if data was sent successfully
    if (status == 200) {
      Serial.println("Data sent to ThingSpeak successfully!");
    } else {
      Serial.print("Error sending data to ThingSpeak. HTTP status code: ");
      Serial.println(status);
    }

    // Activate LED and buzzer
    digitalWrite(ledPin, HIGH);
    digitalWrite(buzzerPin, HIGH);
    delay(1000);
    digitalWrite(ledPin, LOW);
    digitalWrite(buzzerPin, LOW);
  }

  // Delay for stability
  delay(10000); // Increase the delay to 10 seconds
}