Infrared remote control button decoding

The key decoding process of an infrared remote control mainly involves identifying and analyzing specific encoded signals emitted by the remote control. These signals typically use specific encoding formats, such as PPM (Pulse Position Modulation) or PWM (Pulse Width Modulation), where "0" and "1" are distinguished by the width or position of the pulse. The decoding process includes:

Identification guide code: When the remote control sends a signal, it first sends a specific guide code to identify the start of the signal. The decoder needs to correctly recognize this pilot code to determine if the next received data is a valid remote control command.

Analyzing data codes: Subsequently, the remote control sends data codes consisting of a series of "0s" and "1s", each represented by a specific pulse width or position. The decoder determines whether it is "0" or "1" by measuring the width or position of these pulses.

Verify data correctness: In order to ensure data accuracy, the remote control may send the reverse code of the data or enhance signal reliability by repeatedly sending the same data code. The decoder verifies the correctness of the data by comparing the received data and its inverse, or by comparing the same data code twice.

The entire decoding process requires a microcontroller or microcontroller to process the received signal, and the above steps are implemented through programming to convert the infrared signal emitted by the remote control into recognizable control commands.