How do the infrared remote control signals operate?
A1 [Summary] Infrared remote control uses an infrared ray with wavelength of approximately 950 nm to transmit several bytes of information at low speed. Although infrared rays are used to transmit binary (0/1) data, this is not simply a matter of representing binary values by the ON/OFF status of infrared rays. An example of the NEC format is described below. [General format] The infrared remote control signal starts with a leader code. Next comes a 16-bit custom code, then an 8-bit data code and an inverted binary 8-bit code, and finally a stop bit. An example of the infrared remote control format is shown below. This signal is followed by a frame space during which no infrared rays are emitted. The total frame length (including everything from the leader to the frame space) is 108 ms. Example of NEC format for infrared remote control [Leader code] The leader code stays ON for a 9-ms period, then is OFF for a 4.5-ms period. Since this part’s waveform (timing) differs greatly from the
