Smart Fermentation Chamber under $50?

📦 DIY Smart Tempeh Fermentation Chamber (ESP32 + Heater + Fan) In this video, I show you how I built a DIY smart fermentation chamber to make perfect tempeh at home — even in chilly Germany. 🧤❄️ Instead of buying an expensive commercial fermentation box, I built my own using: • An ESP32-C3 Mini • A heater and fan • A DHT11 sensor for temperature and humidity • An OLED display • A rotary encoder for input • And a bit of custom code to control everything I even implemented software PWM to manage fan speed — without using analogWrite() — by toggling digital pins on and off based on timing logic. 🔧 Along the way, I’ll show: ✅ How I wired everything up ✅ A sneak peek into the code ✅ How PWM works (with a fun diagram!) ✅ A small soldering mistake I fixed in software 😅 ✅ And the final result: beautiful homemade tempeh! ⸻ 📁 Full Code + Parts List 👉 https://github.com/auryn31/fermentation-chamber ⸻ If you’re into DIY electronics, ESP32 projects, fermentation, or just tinkering, hit like and subscribe! 💬 Drop a comment if you want me to add Wi-Fi, cloud logging, or SMS alerts next!