few centimetres to several feets, it depends upon the type of IR transmitter and the manufacturer. IR LEDs have light-emitting angle of approx. Other than emitting invisible infrared light, IR LED looks like a normal LED and also operates like a normal LED, means it consumes 20mA current and 3vots power. Infrared have the same properties as visible light, like it can be focused, reflected and polarised like visible light. Everything which produce heat, emits infrared like our human body. The wavelength of Infrared (700nm – 1mm) is just beyond the normal visible light. We cannot see Infrared light through our eyes, they are invisible to human eyes. IR LED emits infrared light, means it emits light in the range of Infrared frequency. We are using IR LED as transmitter and TSOP1738 as IR receiver. Here in our circuit we are building IR remote and its receiver. TV generally consists of TSOP1738 as the IR receiver, which senses modulated IR pulses and convert them into electrical signal. TV remotes and AC remotes are the best example of IR transmitters. IR Transmitter and IR Receiver are commonly used to control electronic devices wirelessly, mainly through a remote.
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