rk3568 compatible infrared remote control
Life is full of electromagnetic waves of various wavelengths. The so-called visible (color) light is the electromagnetic spectrum visible to the human eye. Its wavelength is 380~770nm. In order to avoid the light emitted by the remote control from causing discomfort to the human eye and reduce interference from general artificial light sources, Therefore, the infrared (Infrared) wavelength invisible to the human eye is selected. At present, almost all remote control emitters in the industry use a wavelength of 940nm.
The application of infrared remote control is also a kind of wireless signal transmission. Like most wireless transmission technologies, in order to avoid the interference of electromagnetic waves of the same wavelength in the environment, a carrier frequency (carrier frequency) as shown in Figure 2 will be added to the transmission signal. ), the carrier range in remote control applications is 30~60kHz, and 38kHz is the most common carrier frequency.
Currently, infrared remote control protocols include RC5, SIRCS, Sy, RECS80, Denon, NEC, Motorola, Japanese, SAMSWNG and Daewoo, etc. The Rockchip platform only supports NEC encoding. Fortunately, most domestic electrical appliances use this encoding protocol.