#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
//#include "DHTesp.h"

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

String wifiSSID = "Wokwi-GUEST";
String wifiPassword = "";


String tbHost = "thingsboard.cloud";
String tbToken = "lXDd33moxqZbghZFjhf4";

//const int DHT_PIN = 15;
//DHTesp dhtSensor;

#define ldrPin 34
const float gama = 0.7;
const float rl10 = 50;

void connectWifi() {
  WiFi.begin(wifiSSID.c_str(), wifiPassword.c_str());
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

void sendDataToThingsBoard(String kecerahan) {
  HTTPClient http;
  String url = "http://" + tbHost + "/api/v1/" + tbToken + "/telemetry";
  String payload = "{\"kecerahan\":" + kecerahan + "}";

  http.begin(url);
  http.addHeader("Content-Type", "application/json");

  int httpResponseCode = http.POST(payload);

  if (httpResponseCode > 0) {
    Serial.println("Data sent to ThingsBoard successfully");
  } else {
    Serial.println("Error sending data to ThingsBoard");
  }

  http.end();
}

void setup() {
  Serial.begin(115200);
  connectWifi();
 // dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  lcd.init();
  lcd.backlight();
}

void loop() {
 // TempAndHumidity  data = dhtSensor.getTempAndHumidity();
   int nilaiLDR = analogRead(ldrPin);
  nilaiLDR = map(nilaiLDR, 4095, 0, 1024, 0); //mengubah nilai pembacaan sensor LDR dari nilai ADC arduino menjadi nilai ADC ESP32
  float voltase = nilaiLDR / 1024.*5;
  float resistansi = 2000 * voltase / (1-voltase/5);
  float kecerahan = pow(rl10*1e3*pow(10,gama)/resistansi,(1/gama));
  Serial.print("Kecerahan = ");
  Serial.println(kecerahan);

  String kecerahan1 = String(kecerahan,2);
  //String hum = String(data.humidity,1);

  // Serial.println("Temp: " + String(temp) + "°C");
  // Serial.println("Humidity: " + String(hum) + "%");
  // Serial.println("---");

  lcd.setCursor(0, 0);
  lcd.print("kecerahan: " + kecerahan1); 
  //lcd.setCursor(0, 1);
 // lcd.print("Humidity: " + hum);  

  sendDataToThingsBoard(kecerahan1);
  delay(1000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
}