Keyestudio Smart Little Turtle Robot V3, Manual

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Project 6: IR Reception
(1) Description
There is no doubt that infrared remote control is ubiquitous in daily life. It
is used to control various household appliances, such as TVs, stereos, video
recorders and satellite signal receivers. Infrared remote control is
composed of infrared transmitting and infrared receiving systems, that is,
an infrared remote control and infrared receiving module and a single-chip
microcomputer capable of decoding. ​
The 38K infrared carrier signal emitted by remote controller is encoded by
the encoding chip in the remote controller. It is composed of a section of
pilot code, user code, user inverse code, data code, and data inverse code.
The time interval of the pulse is used to distinguish whether it is a 0 or 1
signal and the encoding is made up of these 0, 1 signals.
The user code of the same remote control is unchanged. The data code can
distinguish the key.