Tutorial ESP32: Cara Membuat Smart Coffee Storage Auto Vacuum dan RTC Resting Timer Berbasis Blynk IoT pada WOKWI

Pada bagian ini akan dibahas pembuatan sistem wadah penyimpanan biji kopi pintar (Smart Coffee Storage) berbasis mikrokontroler ESP32, sensor suhu dan kelembapan DHT22, modul RTC DS1307 untuk menghitung durasi resting kopi, relay penggerak pompa vakum, LED indikator, buzzer alarm, layar LCD 16×2 I2C, serta platform Blynk IoT pada software simulasi WOKWI. Skematik rangkaian ditunjukkan pada Gambar 1, program Arduino pada Kode 1, dan video pembuatan pada tautan Video 1. Sistem mengontrol pompa vakum secara otomatis saat kelembapan udara tinggi guna menjaga kesegaran biji kopi, memantau hari proses resting kopi menggunakan jam RTC secara akurat, serta mengirimkan data dan notifikasi peringatan ke dashboard aplikasi Blynk IoT.

Gambar 1. Skematik rangkaian sistem

List Pin:

• LCD 16×2 I2C (Alamat: 0x27)
  GND => GND
  VCC => 5V / 3.3V
  SDA => GPIO 21
  SCL => GPIO 22
• Sensor Suhu & Kelembapan (DHT22)
  VCC => 3.3V / 5V
  Data => GPIO 15 (DHTPIN)
  GND => GND
• Modul Real-Time Clock (RTC DS1307)
  GND => GND
  VCC => 5V
  SDA => GPIO 21 (I2C SDA)
  SCL => GPIO 22 (I2C SCL)
• Relay Pompa Vakum
  Signal => GPIO 19 (RELAY_VACUUM)
• LED Indikator Red (Proses Vakum)
  Anode (+)=> GPIO 4 (LED_RED)
• LED Indikator Green (Kondisi Ideal)
  Anode (+)=> GPIO 2 (LED_GREEN)
• Buzzer Alarm
  Positive => GPIO 13 (BUZZER_PIN)

List Virtual Pin:

• V0 => Read Humidity (%) – Datastream Nilai Kelembapan Sensor DHT22
• V1 => Read Temperature (°C) – Datastream Nilai Suhu Sensor DHT22
• V2 => Status Coffee Storage (String) – Menampilkan Status “IDEAL / KEDAP”, “VACUUMING…”, atau “MANUAL VACUUM”
• V3 => Relay / Vacuum State (Integer 0-255) – Indikator Widget LED/Gauge Status Pompa Vakum Aktif/Mati
• V4 => Switch Manual Vacuum (Integer 0/1) – Tombol Sakelar Kontrol Vakum Manual dari Aplikasi Blynk
• V5 => Status Resting Kopi (String) – Menampilkan Jumlah Hari Resting Kopi (Contoh: “Resting: 3 Hari”)
• V6 => Button Reset Timer Resting (Integer Push 1) – Tombol Reset Hari Resting Kopi Kembali ke Nol

Kode Arduino 1. Kode Program

// ============================= 
// ALFIAN CENTER 
// SUBSCRIBE 
// RASA KOPI LEBIH NIKMAT! Buat Smart Coffee Storage Auto Vacuum + RTC Resting Timer ESP32 Blynk IoT WOKWI
// PROGRAM BAKAL AKU KIRIM DENGAN SYARAT DIBAWAH 
// LIKE 50, KOMEN 30 DAN * WAJIB SUBSCRIBE *
// PROGRAM DIKIRIM VIA KOMENTAR 
// =============================

#define BLYNK_TEMPLATE_ID "TMPL6IQZvllFP"
#define BLYNK_TEMPLATE_NAME "Coffee Storage V4"
#define BLYNK_AUTH_TOKEN "7gSoVvxbWeQ5Zuarqqiwb_2X7z_zwAU3"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include "DHT.h"

#define DHTPIN 15
#define DHTTYPE DHT22

#define RELAY_VACUUM 19
#define LED_GREEN 2
#define LED_RED 4
#define BUZZER_PIN 13

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

DHT dht(DHTPIN, DHTTYPE);
RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2);
BlynkTimer timer;

bool manualVacuumMode = false;
bool isVacuumActive = false;
unsigned long restStartUnix = 0; // Waktu awal simpan/roast dalam Epoch/Unix

BLYNK_WRITE(V4) {
  manualVacuumMode = param.asInt() == 1;
}

// Tombol V6 untuk reset hari resting ketika memasukkan biji kopi baru
BLYNK_WRITE(V6) {
  if (param.asInt() == 1) {
    DateTime now = rtc.now();
    restStartUnix = now.unixtime();
    Blynk.logEvent("coffee_alert", "🔄 Timer Resting Kopi Direset! Perhitungan hari dimulai dari nol.");
  }
}

void checkCoffeeStorageV4() {
  float hum = dht.readHumidity();
  float temp = dht.readTemperature();
  DateTime now = rtc.now();

  if (isnan(hum) || isnan(temp)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!!  ");
    return;
  }

  // Set awal jika belum di-reset
  if (restStartUnix == 0) {
    restStartUnix = now.unixtime();
  }

  // Hitung berapa hari kopi sudah di-resting
  unsigned long currentUnix = now.unixtime();
  int daysResting = (currentUnix - restStartUnix) / 86400;

  String restStatus = "Resting: " + String(daysResting) + " Hari";
  String coffeeStatus = "";

  // 1. LOGIKA KONTROL POMPA VAKUM
  if (hum > 60.0 || manualVacuumMode) {
    digitalWrite(RELAY_VACUUM, HIGH);
    if (!isVacuumActive && !manualVacuumMode) {
      tone(BUZZER_PIN, 1000, 300);
      Blynk.logEvent("coffee_alert", "⚠️ PERINGATAN! Kelembapan " + String(hum, 1) + "%. Auto Vacuum Aktif!");
    }
    isVacuumActive = true;
    coffeeStatus = manualVacuumMode ? "MANUAL VACUUM" : "VACUUMING...";
  } 
  else if (hum <= 55.0 && !manualVacuumMode) {
    digitalWrite(RELAY_VACUUM, LOW);
    isVacuumActive = false;
    coffeeStatus = "IDEAL / KEDAP";
  } 
  else {
    if (isVacuumActive) {
      digitalWrite(RELAY_VACUUM, HIGH);
      coffeeStatus = "VACUUMING...";
    } else {
      coffeeStatus = "IDEAL / KEDAP";
    }
  }

  // Indikasi LED
  if (isVacuumActive) {
    digitalWrite(LED_RED, HIGH);
    digitalWrite(LED_GREEN, LOW);
  } else {
    digitalWrite(LED_RED, LOW);
    digitalWrite(LED_GREEN, HIGH);
  }

  // 2. UPDATE DATA KE BLYNK IOT
  Blynk.virtualWrite(V0, hum);
  Blynk.virtualWrite(V1, temp);
  Blynk.virtualWrite(V2, coffeeStatus);
  Blynk.virtualWrite(V3, digitalRead(RELAY_VACUUM) ? 255 : 0);
  Blynk.virtualWrite(V5, restStatus);

  // 3. UPDATE DISPLAY LCD 16x2
  lcd.setCursor(0, 0);
  lcd.print("H:"); lcd.print(hum, 0); lcd.print("% ");
  lcd.print("D:"); lcd.print(daysResting); lcd.print("Hari ");
  lcd.print(now.hour() < 10 ? "0" : ""); lcd.print(now.hour()); lcd.print(":");
  lcd.print(now.minute() < 10 ? "0" : ""); lcd.print(now.minute());

  lcd.setCursor(0, 1);
  lcd.print("ST:"); lcd.print(coffeeStatus); lcd.print("        ");
}

void setup() {
  Serial.begin(115200);

  pinMode(RELAY_VACUUM, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_RED, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  digitalWrite(RELAY_VACUUM, LOW);

  dht.begin();
  lcd.init();
  lcd.backlight();

  if (!rtc.begin()) {
    lcd.print("RTC Error!");
    while (1);
  }

  // Jika RTC kehilangan daya, atur ke waktu kompilasi
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  lcd.print("Smart Coffee V4");
  lcd.setCursor(0, 1);
  lcd.print("Vacuum + RTC    ");
  delay(1500);

  Blynk.begin(auth, ssid, pass);
  lcd.clear();

  timer.setInterval(2000L, checkCoffeeStorageV4);
}

void loop() {
  Blynk.run();
  timer.run();
}

Video 1. Video tutorial pembuatan

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