Tutorial IoT: Kontrol Lampu Jarak Jauh Menggunakan ESP32 & Blynk

// ====================================================
// Kontrol Lampu ESP32 + Blynk IoT
// Ganti nilai di bawah ini sesuai akun Blynk Anda
// ====================================================

#define BLYNK_TEMPLATE_ID    "TMPLxxxxxxxx"
#define BLYNK_TEMPLATE_NAME  "Smart Lamp"
#define BLYNK_AUTH_TOKEN     "YourAuthTokenHere"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

// ---- Kredensial WiFi ----
const char* ssid     = "NAMA_WIFI_ANDA";
const char* password = "PASSWORD_WIFI";

// ---- Pin GPIO ----
const int RELAY_PIN = 26;  // Pin kontrol relay
const int PWM_PIN   = 25;  // Pin PWM untuk dimmer (opsional)

// ---- Status lampu ----
bool lampState  = false;
int  brightness = 255;

// ------------------------------------------------
// Virtual Pin V0: Tombol ON/OFF
// Tipe: Button (mode SWITCH, 0=OFF, 1=ON)
// ------------------------------------------------
BLYNK_WRITE(V0) {
  int value = param.asInt();  // 1 = tekan, 0 = lepas
  
  if (value == 1) {
    lampState = true;
    digitalWrite(RELAY_PIN, LOW);   // Aktifkan relay (active-low)
    Blynk.virtualWrite(V2, "MENYALA");  // Update status di app
    Serial.println("[Blynk] Lampu: MENYALA");
  } else {
    lampState = false;
    digitalWrite(RELAY_PIN, HIGH);  // Nonaktifkan relay
    Blynk.virtualWrite(V2, "MATI");
    Serial.println("[Blynk] Lampu: MATI");
  }
}

// ------------------------------------------------
// Virtual Pin V1: Slider Kecerahan (0–255)
// Hanya aktif jika lampu sedang menyala
// ------------------------------------------------
BLYNK_WRITE(V1) {
  brightness = param.asInt();
  
  if (lampState) {
    // Tulis nilai PWM (0–255) ke pin dimmer
    analogWrite(PWM_PIN, brightness);
    Serial.print("[Blynk] Kecerahan: ");
    Serial.println(brightness);
  }
}

// ------------------------------------------------
// Callback saat koneksi Blynk berhasil/ulang
// ------------------------------------------------
BLYNK_CONNECTED() {
  // Sinkronisasi status dari server saat reconnect
  Blynk.syncVirtual(V0);
  Blynk.syncVirtual(V1);
  Serial.println("[Blynk] Terhubung ke server!");
}

// ------------------------------------------------
// Setup awal
// ------------------------------------------------
void setup() {
  Serial.begin(115200);
  
  // Inisialisasi pin
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, HIGH);  // Mulai dalam kondisi MATI
  
  ledcSetup(0, 5000, 8);          // Channel 0, freq 5kHz, resolusi 8-bit
  ledcAttachPin(PWM_PIN, 0);       // Pasang pin PWM ke channel 0

  // Hubungkan ke Blynk (WiFi + cloud sekaligus)
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, password);
  
  Serial.println("[Setup] ESP32 siap!");
}

// ------------------------------------------------
// Loop utama
// ------------------------------------------------
void loop() {
  Blynk.run();  // Jalankan loop Blynk (wajib ada)
}

// Tambahkan di dalam BLYNK_WRITE(V0):
if (value == 1) {
  Blynk.logEvent("lamp_on", "Lampu dinyalakan!");
} else {
  Blynk.logEvent("lamp_off", "Lampu dimatikan.");
}

// Catatan: Buat Event "lamp_on" dan "lamp_off"
// di menu Events pada Template Blynk Anda.