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

// Define the pins
const int relayPin = 23;   // Pin connected to the relay module (change as needed)
const int tempPin = 34; 
const int ledPin =18;
  // Pin connected to the analog temperature sensor

// Define temperature threshold
const float TEMP_THRESHOLD = 100.0; // Temperature in Celsius to turn the light on

// Wi-Fi credentials
char ssid[] = "Wokwi-GUEST";      // network SSID (name)
char pass[] = "";                 // network password
WiFiClient client;


// ThingSpeak settings
const unsigned long CHANNEL_ID = 2632350; // Replace with your Channel ID
const char* WRITE_API_KEY = "0NSOZG90XD1QW0SA";  // Replace with your Write API Key
const char* server = "api.thingspeak.com";


void setup() {
  // Initialize serial communication
  Serial.begin(115200);

   
  
  // Initialize relay pin as output
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);

  // Connect to Wi-Fi
  WiFi.begin(ssid, pass);
  Serial.print("Connecting to ");
  Serial.print(ssid);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected!");
  
  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Read the temperature sensor
  int sensorValue = analogRead(tempPin);
  
  // Convert the sensor value to temperature in Celsius
  // The ESP32 ADC reads values from 0 to 4095, and the reference voltage is 3.3V
  float voltage = (sensorValue / 4095.0) * 3.3;
  float temperature = voltage * 100.0; // Assuming 10mV/°C for LM35 or similar

  // Print the temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");
  
  // Control the relay based on temperature
  bool isLightOn = temperature > TEMP_THRESHOLD;
  digitalWrite(relayPin, isLightOn ? HIGH:LOW);

  // Initialize LED pin as output
  pinMode(18, OUTPUT);        // Set the LED pin as an OUTPUT
  digitalWrite(18,HIGH);      // Ensure the LED 
  delay(10000);
  digitalWrite(18, LOW);
  delay(10000);
  
  // Print the status of the street light (LED) to the Serial Monitor
  if (isLightOn) {
    Serial.println("Street light ON");
  } else {
    Serial.println("Street light OFF");
  }
  
  // Send data to ThingSpeak
  ThingSpeak.setField(1, temperature); // Field 1 for temperature
  ThingSpeak.setField(2, isLightOn ? 1 : 0); // Field 2 for light status
  
  // Update ThingSpeak
  int httpCode = ThingSpeak.writeFields(CHANNEL_ID, WRITE_API_KEY);
  if (httpCode == 200) {
    Serial.println("Data sent to ThingSpeak successfully.");
  } else {
    Serial.print("Error sending data: ");
    Serial.println(httpCode);
  }
  
  // Wait before taking another reading
  delay(2000); // 20 seconds delay
}