~: IR Remote Controls :~
As I have already told you when an interface used between transmitter and receiver in infrared (IR) then it is called IR remote control. In whole frequency spectrum infrared region just legs behinds visible spectrum and its frequency range is between 0.1-100 Tera Hz. Its wavelength is in terms of micrometer (µm)
In IR remotes IR LED is used in transmitters which emits IR light. In receivers any IR light detector can be used like photo diode, photo transistor etc. I have used IR sensor used in TV/VCD/Music systems as a IR detector because it's performance is best.
These remotes are advantageous because
Advantages:-
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Very chip. Cost of the components used is very less compare to RF remotes
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Easy to implement
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Small and handy because no need of bulky antennas as in the case of RF remotes
Also there are certain limitations of these remotes
Disadvantages:-
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They have quite less range compare to RF remotes. Usually up to 10 meter
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Less directivity means you have to point the remote toward the sensor every time when you press a switch
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Line of sight is required means transmitter can not communicate with receiver if they are not in line of sight of each other
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IR light can not penetrate through big obstacles like wall, partition etc.
Because of these limitations these kind of remotes are usually used for general purpose applications like (as I told you earlier) to ON/OFF any AC/DC device in homes/offices/shops, fan regulator, remote bell etc. These kind of remotes are not used for specific applications in industries because of its limitations.
