HID Human Interface Device (Human Interface Device) is one of the first USB device types fully supported by the Windows operating system. On computers running Windows 98 or higher, applications can use the operating system built-in drivers. HID device communication, for this reason, HID-compliant USB devices can be easily set up and running. However, the HID device does not have to have a man-machine interface. It only needs to play a role within the limits of the HID class specification. The main functions and limitations of the HID class are as follows: The exchanged data resides in a structure called a report; Each transaction contains a small to medium amount of data; the device can send information to the computer in unpredictable times, and so on. Although many HID devices mainly send data from the device to the host, the HID device can receive data from the host. Therefore, any device that works within the limits of the HID class can be called a HID device. These devices can send data. To the computer, a request to configure the device can also be received from the computer. An example of the primary responsibility for receiving data is a remote display, a control panel of the remote device, and any type of device that receives occasional or periodic commands from the host. The HID device can be one of a plurality of USB interfaces supported by the device, and can be either a low speed device or a full speed device. Microsoft provides and supports HID drivers on its Windows 98 and above operating systems, enabling device manufacturers to easily develop devices that conform to HID interface standards.
reason
Compared with the use of high-power halogen lamps in the mid-to-high-end cars and the use of high-power halogen lamps in some off-road vehicles, many domestic auto manufacturers have reduced the standard Xenon car headlights that were originally standard in foreign countries into wholesale prices only in order to save costs. A few ordinary yuan, a common halogen lamp with a power of about 50W. This kind of inferior halogen headlights, which are called "chicken lights" by the majority of car owners, have limited brightness and short front distance. If the design of the lamp cup is not good, the light will be irregularly diverged. It is not even comparable to the professional flashlight in the hands of senior friends. Therefore, after many car owners have been driving for a while, they will use various methods to increase the brightness of their car's headlights and increase the color temperature of the lights as appropriate to help improve driving comfort and safety. However, it is precisely because of this, it has created the current unevenness of the domestic car headlight conversion industry and the chaos. In this way, not only can the driver not enjoy the driving comfort and safety brought by the car headlight retrofit, but it may make the modified vehicle become a road killer, directly threatening the safety of other driving cars on the road.
Misunderstanding
Color temperature is also a problem that needs attention. Many car owners believe that the higher the color temperature, the better. In fact, this is a misunderstanding. If you look closely, almost all the high-end car original Xenon lights have a color temperature of only 4000k, because the higher the color temperature, the bluer the color, the worse the penetrating power, especially in the rainy and foggy days. And color temperature and brightness do not matter, the brightness is only related to the lumen value, the kind of 8000k, or even more than 10,000 k blue stunned Xenon lights, the actual bad business is to lie to those who do not understand the car, but also to install cool car owners only. There is also whether the high beam needs a xenon lamp. This topic is a bit of a matter of opinion, because many people have the habit of flashing lights warning, overtaking flashing lights, car flashing lights... If you switch to xenon lights, there will be a delay phenomenon, which means that the far lights will not flash. Many so-called double xenon lamp assemblies, in fact, the high beam or halogen lamp, but the xenon lamp with lens and low beam has a drive assembly, which is convenient for raising the high beam illumination. However, in this way, the price can be very expensive.
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