What is IR sensor ? How IR sensor works ?

What is an IR Sensor ?

An IR sensor ( Infra-red Sensor) is a device that uses invisible light to detect objects or measure distances.

How Does an IR Sensor Work?

1. Two Main Parts:

   • IR Emitter (like a flashlight): Sends out invisible infrared light.
   • IR Receiver (like an eye): Detects the infrared light that bounces back from an object.

2. What Happens?

• The IR emitter sends out infrared light.
• If there’s an object in front of the sensor, the light hits the object and reflects back.
• The IR receiver detects the reflected light and tells the system, “Hey, there’s something in front of me!”

3. Application: Everyday Examples of IR Sensors

• TV Remote: Sends infrared signals to your TV to change channels. 
• Automatic Doors: Open when they detect someone nearby using IR sensors.
• Obstacle Avoiding Robots: IR sensors help them avoid crashing into walls.

4. Activity Idea for Students (How i can see the IR (Infrared light))

   Take a TV remote and point it at a phone camera. Press any button, and they’ll see the infrared light blinking on the camera screen! This makes the "invisible" infrared light visible to them.

5. Key Points for Students

• Pulse Patterns: The remote sends specific patterns of IR pulses for each button. For example, pressing "Volume Up" sends a different signal than "Channel Up."
• Line of Sight: IR signals usually need a clear path to the TV sensor, which is why remotes don’t work well if something blocks the sensor.