Why do remote controls use infrared light instead of other wavelengths?
In: Technology
IR sensors are cheap and easy to manufacturer and do not require approval from the FCC. Since you’ll always be facing the TV, there’s no need for an RF remote, as the IR sensor will always be facing you. Also, since IR is mostly limited to line of sight, it’s highly unlikely that if your neighbor has the same make and model of TV, that their remote will be able to control your TV if they’re very close. Where as with RF, this could be possible, which would make the system more complicated as special encoding methods would be necessary.
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