// Untuk menyambungkan ke Blynk
#define BLYNK_TEMPLATE_ID "TMPL6bG1F4hxQ"
#define BLYNK_TEMPLATE_NAME "Lampu Otomatis"
#define BLYNK_AUTH_TOKEN "W33XxFLXFM3VI5JM7WX6At50bw2UTGHV"

// Mendeklarasikan library yang digunakan
#include <LiquidCrystal_I2C.h>
#include <BlynkSimpleEsp32.h>
#define BLYNK_PRINT Serial

//Menginisiasikan lcd I2C
LiquidCrystal_I2C lcd(0x27, 16, 2);

//Untuk menyambungkan ke Blynk part 2
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

// Mendeklarasikan pin yang digunakan
#define LDRPin 27
#define LEDPin 2

// variabel kalibrasi LDR
const float GAMMA = 0.7;
const float RL10 = 50;


void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.setBacklight(HIGH);
  Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);

  pinMode(LDRPin, INPUT);
  pinMode(LEDPin, OUTPUT);

  timer.setInterval(100L, sendSensorData);
}

void sendSensorData() {
  int nilaiADC = analogRead(LDRPin);

  //Kalibrasi LDR
  float voltage = nilaiADC * 5 / 4095.0;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  //Menampilkan nilai lux di lcd
  lcd.setCursor(0, 0);
  lcd.print("Lux: ");
  lcd.print(lux);

  if (lux <= 200)
  {
    digitalWrite(2, HIGH);
  }
  else
  {
    digitalWrite(2, LOW);
  }
  delay(20);
}

void loop() {
  Blynk.run();
  timer.run();
}