#include <Wire.h>
#include <LiquidCrystal.h>

#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>

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


String tbHost = "demo.thingsboard.io";
String tbToken = "q7MNmn4vBq9Eu2l9Pkti";


void connectWifi() {
  WiFi.begin(wifiSSID.c_str(), wifiPassword.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"}";
  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();
}

const float BETA = 3950;
float suhu = 0.0;

// Analog input pin for the NTC thermistor
const int NTC_PIN = 34;

// Buzzer control pin
const int BUZZER_PIN = 12;

// Temperature threshold to trigger the alarm (adjust as needed)
const float TEMPERATURE_THRESHOLD = 70.0;

// LCD settings
LiquidCrystal lcd(15,2,4,5,18,19);  

float bacaSensorNTC(){
  //Baca nilai sensor menggunakan input analog
  int analogValue = analogRead(NTC_PIN);

  //Kalibrasi untuk mengkonversi nilai analog menjadi nilai suhu celsius
  float celsius = 1 / (log(1 / (4095. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  return celsius;
}

void setup() {
  Serial.begin(115200);
  connectWifi();
  lcd.begin(16, 2);
  lcd.print("Temperature:");
  pinMode(BUZZER_PIN, OUTPUT);
  ledcSetup(0, 5000, 8); // LEDC channel 0, 5000 Hz PWM, 8-bit resolution
}

void loop() {
  suhu = bacaSensorNTC();

  String temp = String(suhu);

  lcd.setCursor(0, 1);
  lcd.print(suhu);
  lcd.print("C");

  if (suhu < TEMPERATURE_THRESHOLD) {
    // Sound the buzzer (if using an active buzzer)
    // For a passive buzzer, this part depends on the circuit configuration
    tone(BUZZER_PIN, 1000); // You can adjust the frequency for a different sound
  } else {
    noTone(BUZZER_PIN);
  }
  sendDataToThingsBoard(temp);
  delay(1000); // Wait for 1 second before updating temperature
}