#define BLYNK_TEMPLATE_ID "TMPL6Gd5yjdP8"
#define BLYNK_TEMPLATE_NAME "NTC"
#define BLYNK_AUTH_TOKEN "3IpVwVr33yR2v15DpN9Zj466PqfBFrlB"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <math.h>

#define RELAY_PIN  32  
#define BUZZER_PIN 2  
#define LED_PIN    15  
#define NTC_PIN    34  // Pin data untuk NTC thermistor (analog input)

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

LiquidCrystal_I2C lcd(0x27, 16, 2);

// Add the BETA constant for the NTC thermistor
#define BETA 3950  // Example value, you may need to adjust this for your thermistor

void setup() {
  Wire.begin(21, 22);
  delay(200);
  lcd.init();
  lcd.backlight();
  lcd.print("LCD OK!");
  delay(1000);
  
  Serial.begin(115200);
  Serial.println("System Initialized");

  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  Blynk.begin(auth, ssid, pass); // Initialize Blynk connection
}

void loop() {
  int analogValue = analogRead(NTC_PIN); // Read the analog value from the thermistor pin
  float celsius = 1 / (log(1 / (4095. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  Serial.print("Temperature: ");
  Serial.print(celsius);  // Print the correct temperature variable
  Serial.println(" C");

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.setCursor(0, 1);
  lcd.print(celsius);  // Print the correct temperature variable
  lcd.print(" C");

  if (celsius > 30.0) { // Example threshold: 30°C
    Blynk.virtualWrite(V0, 1);  // Send status to Blynk (V0 pin)
    Serial.println("High Temp Detected!");

    // Activate relay, buzzer, and LED
    digitalWrite(RELAY_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000);  // Turn on buzzer
  } else {
    Blynk.virtualWrite(V0, 0);  // Send status to Blynk (V0 pin)

    // Deactivate relay, LED, and buzzer
    digitalWrite(RELAY_PIN, LOW);
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
  }

  delay(1000);
  Blynk.run();  // Call this function to keep Blynk running
}

// BLYNK_WRITE for controlling the LED from Blynk app
BLYNK_WRITE(V2) {
  int pinValue = param.asInt(); // Get the value from virtual pin V2 (Button widget)
  
  if (pinValue == 1) {  // If button is pressed
    digitalWrite(LED_PIN, HIGH);  // Turn on the LED
    Serial.println("LED ON via Blynk");
  } else {  // If button is released
    digitalWrite(LED_PIN, LOW);  // Turn off the LED
    Serial.println("LED OFF via Blynk");
  }
}