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

// Wi-Fi credentials
char ssid[] = "Wokwi-GUEST";  // SSID for the Wi-Fi network
char pass[] = "";             // Password for the Wi-Fi network (empty)

// ThingSpeak channel details
unsigned long myChannelNumber = 2629998;
const char *myWriteAPIKey = "WCAJRI5PH2NAZ8LX";
const char *server = "api.thingspeak.com";

// Pin definitions
const int ldrPin = 34;  // ADC pin for LDR
const int relayPin = 23; // Digital pin for relay control

int ldrValue = 0;      // Variable to store the LDR value
int threshold = 500;   // Threshold value for LDR to activate the relay

WiFiClient client;

void setup() {
  Serial.begin(115200);  // Start serial communication for debugging

  pinMode(ldrPin, INPUT);  // Set the LDR pin as input
  pinMode(relayPin, OUTPUT);  // Set the relay pin as output
  digitalWrite(relayPin, LOW);  // Ensure relay is off initially

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

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  ldrValue = analogRead(ldrPin);  // Read the LDR value
  Serial.print("LDR Value: ");
  Serial.println(ldrValue);  // Print the LDR value to the serial monitor

  // Check if the LDR value is below the threshold
  if (ldrValue < threshold) {
    digitalWrite(relayPin, HIGH);  // Turn on the relay
  } else {
    digitalWrite(relayPin, LOW);  // Turn off the relay
  }

  // Update ThingSpeak with the LDR value
  ThingSpeak.setField(1, ldrValue);
  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));
  }

  delay(5000);  // Wait for 5 seconds before the next update
}