Reelgrowth on Instagram: "The second someone crosses this invisible line, your screen instantly switches back to whatever you were working on. This setup uses a physical laser tripwire placed across a doorway. When the beam is broken, the system triggers an immediate response, restoring your screen to a safe state before anyone can read a single word. There's no webcam tracking, no facial recognition, and no invasive software. A simple laser, optical sensor, and microcontroller translate real-wo