The infrared receiving head is generally an integrated head of receiving, amplifying and demodulating. After the infrared receiving head is demodulated, the difference between data 0 and 1 is usually reflected in the length of the high and low level or the signal cycle. When the microcontroller is decoded, it will usually receive The head output pin is connected to the external interrupt of the single-chip microcomputer, combined with the timer to determine the time of the external interrupt interval, so as to obtain the data. The key is to find the waveform difference between data 0 and 1.

　　 The three-legged infrared receiving head is an integrated head of receiving, amplifying, and demodulating. The receiving head outputs data signals (specific signal format, search infrared signal format), single-chip microcomputer program.

　　Infrared communication is the use of infrared technology to realize close-distance confidential communication and information transmission between two points. It is usually composed of infrared transmitting and receiving system. After preparing the infrared radiation source, the infrared signal is emitted, and the receiving system is received by the optical device and the infrared detector to form an infrared communication system.

　　 Then, let’s talk about what infrared is. As we all know, the visible light that the human eye can see is arranged from longest to shortest wavelength, in order of red, orange, yellow, green, blue, and purple. Among them, the wavelength range of red light is 0.62~0.76μm; the wavelength range of purple light is 0.38~0.46μm. Light with a shorter wavelength than violet light is called ultraviolet light, and light with a longer wavelength than red light is called infrared light. Infrared remote control uses near-infrared transmission control signal with wavelength between 0.76~1.5μm.