How TV remote IR sensor works ?

 How TV remote IR sensor works ?

• The TV remote acts as the transmitter:
  It sends out infrared light signals (like a message) when you press a button.

• The TV has the receiver:
  It detects and reads the infrared signals sent by the remote and performs the action (like changing the channel or volume).

Type of IR Sensor in the TV

The IR sensor used in TVs is typically called an IR Receiver Module or Photo Diode-Based IR Sensor.

Components of the TV IR Sensor:

1. Photodiode (or IR Detector):

   • A special component that detects infrared light.
   • It generates a small electrical signal when IR light falls on it.

2. Demodulator Circuit:

   • Decodes the signal received by the photodiode.
   • Removes any unnecessary noise or extra signals in the environment (like sunlight or heat).

3. Output Signal:

   • After decoding, the IR sensor sends a clean signal to the TV’s microcontroller, telling it what command was received.

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Type of IR Transmission

The TV remote uses Modulated IR Light, meaning the infrared light is turned on and off in a specific pattern (called a frequency, often around 38 kHz).

• This modulation helps the TV distinguish the remote’s signal from ambient IR light, like sunlight or other heat sources.

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How to Categorize This TV IR Sensor:

The TV IR sensor is a Passive IR Sensor, specifically a TSOP (Thin Small Outline Package) IR Receiver Module.

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Examples of Common TV IR Receiver Modules:

1. TSOP1738
2. TSOP1838
3. VS1838B