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

WiFiClient client;
unsigned long myChannelNumber = 2758007;
const char* myWriteAPIKey = "FHSCZ6GOGMGEMGRP"; // Replace with your API key
const char* ssid = "Wokwi-GUEST"; // Network SSID

#define LIGHT_SENSOR_PIN 4 // ESP32 pin GPIO36 (ADC0)

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  Serial.println("Connecting to WiFi...");

  // Connect to WiFi
  while (WiFi.begin(ssid, "") != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

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

void loop() {
  // Read the input on analog pin (value between 0 and 4095)
  int analogValue = analogRead(LIGHT_SENSOR_PIN);

  // Print the raw analog reading
  Serial.print("Analog Value = ");
  Serial.println((5-analogValue*5/1023)/(analogValue*5/1023));

  // Determine the light intensity
  if (analogValue < 40) {
    Serial.println(" => Dark");
  } else if (analogValue < 800) {
    Serial.println(" => Dim");
  } else if (analogValue < 2000) {
    Serial.println(" => Light");
  } else if (analogValue < 3200) {
    Serial.println(" => Bright");
  } else {
    Serial.println(" => Very Bright");
  }

  // Send the light sensor data to ThingSpeak
  ThingSpeak.setField(1, analogValue); // Set the value for Field 1
  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); // Write to ThingSpeak
  
  if (statusCode == 200) {
    Serial.println("Data sent to ThingSpeak successfully.");
  } else {
    Serial.print("Failed to send data. Error code: ");
    Serial.println(statusCode);
  }

  // Wait 15 seconds before the next reading (ThingSpeak allows updates every 15 seconds)
  delay(15000); // ThingSpeak update rate
}