Is your servo twitching or spinning erratically when powered directly from your Arduino/ESP32? That’s a classic power shortage issue – the onboard regulator can’t handle the inrush current. In this video, I explain why it happens and show you a super cheap fix (under 20 yuan) using an external power module and a battery. Skip to 0:47 for the wiring solution. Perfect for beginners who want stable, jitter‑free servos without spending a fortune. 🔧⚡