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That is, consist of an infrared remote control, an infrared receiver module and a microcontroller that can decode.
You can refer to the figure below.
The 38K infrared carrier signal transmitted by an infrared remote controller is encoded by an encoding chip
inside the remote controller. It is composed of a pilot code, user code, data code, and data inversion code.
The time interval between pulses is used to distinguish whether it is a signal 0 or 1. (when the ratio of high level
to low level is about 1:1, considered as signal 0.) And the encoding is just well composed of signal 0 and 1.
The user code of the same button on remote controller is unchanged. Using difference data distinguish the key
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