#include <WiFi.h>
#include <ThingSpeak.h>
#define SECRET_SSID "Wokwi-GUEST"
#define SECRET_PASS ""
#define SECRET_CH_ID 1949296
#define SECRET_WRITE_APIKEY "KQI7RW9FLNGY1CPJ"
char ssid[] = SECRET_SSID;
char pass[] = SECRET_PASS;
const int ANLOG_PIN = 34;
WiFiClient client;
unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

void setup() 
{
  Serial.begin(115200);
  while (!Serial)
  {;}
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop()
{
  if (WiFi.status() != WL_CONNECTED)
  {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while(WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      Serial.print(".");
      delay(5000);
    } 
    Serial.println("\nConnected.");
  }
  
  int AnalogValue = analogRead(ANLOG_PIN);
  float ADCvalue = (3.3/4096);
  float Voltage = (AnalogValue*ADCvalue);
  float Lux = (250/Voltage)-50; 
  
  String adc = String(AnalogValue);
  String lux = String(Lux,2);

  Serial.println("Analog Value: " + adc );
  Serial.println("LUX: " + lux );
  Serial.println("---");

  ThingSpeak.setField(3,adc);
  ThingSpeak.setField(4,Lux);
  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(15000);
}