#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>

const int LM35_PIN = 35;
const int numReadings = 10;
int readings[numReadings];
int readingIndex = 0;
int total = 0;

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

String tbHost = "demo.thingsboard.io";
//String tbHost = "thingsboard.cloud";
String tbToken = "hcyTACXCR8DWju7fRzVq";

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

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

  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() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  connectWifi();
  pinMode(LM35_PIN, INPUT);
  analogReadResolution(12);

  for (int i = 0; i < numReadings; i++) {
    readings[i] = 0;
  }
}

void loop() {
  // get the ADC value from the temperature sensor
  int adcValue = analogRead(LM35_PIN);

  // Ubah nilai bacaan menjadi suhu dalam derajat Celsius
  // float temperature = (adcVal / 4095.0) * 330.0;
  //  new calculation:
  // ref: https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/831167/ccs-tms570lc4357-adc-result-convert-to-celsius-degree
  float temperature = (adcValue / 4096.0) * 330.0;
  
  // print the temperature TANPA FILTER in the Serial Monitor:
  Serial.print("Temperature: ");
  Serial.print(temperature);   // print the temperature in Celsius
  Serial.print("°C");
  // Serial.print(" ~ ");
  // Serial.print(adcValue);
  Serial.println(" ~ ");

  sendDataToThingsBoard(String(temperature));
  delay(1000); // this speeds up the simulation
}