What are infrared sensors?

Infrared sensors are like super smart thermometers that can tell what’s happening around them without touching anything.

Imagine you're playing hide and seek in a dark room, it's hard to see where your friends are hiding, but if the room had infrared lights, they would glow like little fireflies, letting you know exactly where everyone is. That's how infrared sensors work: instead of seeing light we can see with our eyes, they detect heat or light that’s invisible to us.

Infrared sensors send out a special kind of light, called infrared light, which you can't see but your skin can feel as warmth. If something is in front of the sensor, like a person or an animal, it reflects that infrared light back, and the sensor catches it, just like how a mirror reflects light when you shine a flashlight on it.

These sensors are used in remote controls (like for your TV), door openers, and even robots! They help robots know where they are and what’s around them, kind of like having a sense of touch without actually touching anything.