Plastic remote control infrared signal for Broadcom/ Technicolor / Comcast/ HUAWEI set top box
It is a kind of wireless remote control devices, using modern digital encoding bai code technology, the key information coding, the transmission light waves by the infrared diode, light waves by the receiver of the infrared receiver to receive the infrared signal into electrical signal, into the processor to decode, demodulating the corresponding instructions to achieve control set-top boxes and other equipment to complete the required operation requirements.A lot of electric equipment use infrared ray remote control, so what is the working principle of infrared ray remote control?First let's look at what infrared is.
The visible light visible to the human eye is arranged in order of wavelength from long to short, red, orange, yellow, green, turquoise, blue, and purple.The wavelength range of red light was 0.62 ~ 0.76 m.The wavelength range of purple light is 0.38 to 0.46 m.Light with wavelengths shorter than violet is called ultraviolet, and light with wavelengths longer than red is called infrared . Infrared remote control is the use of the wavelength of 0.76 to 1.5 m near infrared transmission control signal
The infrared remote control system is usually divided into two parts: transmitting and receiving.
The main component of emitting part is infrared led.It is actually a special light-emitting diode, and because it is made of a different material from ordinary light-emitting diodes, it emits infrared light rather than visible light when a voltage is applied to both ends.
The infrared light emitting diode, which is widely used, emits an infrared wavelength of about 940nm, which is the same shape as ordinary light emitting diode, but with different color.
Infrared led generally has black, dark blue, transparent three colors.
The way to judge the quality of infrared led is the same as that of ordinary diode: measure the positive and reverse resistance of infrared led with multimeter electrical bloc