Infrared Remote Control is a widely used control device in modern electronic devices. It uses infrared for signal transmission to control various electrical equipment. The code value of an infrared remote control is one of its core technologies, and understanding code value knowledge is crucial for designing and using infrared remote controls. What is the infrared remote control code value?

The infrared remote control code value refers to the signal encoding emitted by the remote control. Each button has a unique code value, representing a specific functional command. These code values are sent to the receiving device through an infrared transmitter, which decodes them and performs corresponding operations. For example, the volume up and down, channel switching, and other buttons on a TV remote control all have different code values.
The working principle of infrared remote control

The infrared remote control emits infrared signals through infrared light-emitting diodes (IR LEDs), which contain specific code value information. The receiving device is equipped with an infrared receiver (such as an infrared receiving diode). After receiving the infrared signal, it is converted into an electrical signal, decoded and processed, and corresponding operation instructions are executed.
Common infrared encoding formats

NEC encoding is currently the most widely used encoding format. It adopts pulse coding modulation method, with each pulse corresponding to a bit. The NEC encoding format includes a guide code, address code, command code, and duplicate code. Its characteristics are long code value and strong anti-interference ability.

RC5 coding RC5 coding is a coding format developed by Philips, which adopts Manchester coding method. Each code value consists of 14 binary digits, including the boot bit, system address bit, and command bit. The advantages of RC5 encoding are simple encoding, high reliability, but less information.

Sony SIRC encoding is a coding format developed by Sony Corporation, using pulse width modulation. The code value includes three types: 7 bits, 12 bits, and 15 bits. Its characteristic is that it has a large amount of information and is suitable for complex remote control commands.