What Was the Detect-O-Ray?
🔦 What Was the Detect-O-Ray? Long before Ring doorbells and Nest cameras, there was the Detect-O-Ray—a pioneering photoelectric security device introduced in the early 1940s. Think of it as the grandfather of today’s motion sensors, but built on pure analog ingenuity. How It Worked: One unit emitted an invisible infrared (or visible red) beam across…