【 Weak current College 】 WiFi in smart home applications

WiFi wireless broadband, full name is commonly known as Wireless Fidelity. Its biggest advantage is the high transmission speed, effective distance long, compatibility with international advanced means of communication. IEEE ([United States] electronic and electrical engineers) 802 .11b wireless networking standard is IEEE 802.11 network specification of variants, the maximum bandwidth for 11 Mbit/s, the signal is weak or interference, bandwidth can be adjusted to 5.5Mbit/s, 2Mbit/s and 1Mbit/s AutoFit, bandwidth, and effectively protect the network stability and reliability. Its main characteristics are: speed, high reliability.

2.4GHz ISM band to most countries in the world, universal has the most extensive 802.11b. In 1999 the industrial set up WiFi Alliance to address compliance with the standard products of 802.11 production and device compatibility issues. WiFi to develop 802.11 wireless network organization.

Next-generation wireless network, will be without cabling and the use of relative freedom, set up the wireless LAN of brand new feel. Requirements determine the development of the market, which is very rare to IT technical or product can have like it-like such rapid growth, without any constraint of anytime, anywhere access to the Internet is no longer a dream, where WiFi has played a crucial role. WiFi on behalf of the "wireless fidelity", referring to have full compatibility with standard IEEE802.11b subset of 802.11, it uses the open 2.4GHz direct sequence spread spectrum, maximum data transfer rate of 11Mbit/s, the signal strength may, under the rate adjustment for 5.5Mbit/s, 2Mbit/s and 1Mbit/s bandwidth. No straight lines transmission range is the largest 300 meters outdoors, indoor obstacle of maximum 100 m, is now used by most of the transport protocol.

In the central control of the sectors of the community, the United States market, most of the central control system and the wireless touch screen communication adopted by the majority is RFID radio frequency technology, but with the technological progress of RFID technology in the field of central control has become increasingly apparent. limitations

In a modern high-rise buildings and Auditorium Hall, RF signal is more and more steel and concrete structure barrier, when a project requires a touch screen to control multiple room equipment, often need to install many RF wireless receiver in order to achieve good control effect.

In a real application, support wireless WiFi technology touch screen due to control distance, in a large auditorium and the partition wall is very much in the Gallery can be significantly reduced the wireless receiver installation, even if the control distance exceeds the General control range, we can also be enhanced by installing wireless repeaters to extend the receiver accepts, a medium-sized wireless enhanced repeaters can be original 100 meters distance of the control is increased to 500 meters even 1 km, with transmission power enhancements, wireless WiFi touchscreen enhanced just control distance, more enhanced in steel and concrete structures in penetrating the mobile control fluid motion.
ITAV newly released ITVF85 touchscreen, built-in 54Mbit/s Wireless WiFi module, its maximum transmission distance of up to 300 meters, considerably more than the existing RFID radio frequency Sony of 80 meters. It shows part of a high resolution 16: 9 widescreen display, TFT display 265K true color, 7.5 inch display with resolution up to 800 × 480 pixels, relative to the market mainstream touchscreen product color reproduction of more realistic Visual effects better. At the same time the supplied in Chinese and English interface edit software that supports 3D/2D, video, graphics, pictures, animations, and other interface elements. ITVF85 can make a variety of colorful interface and animation effects, while others are usually only in the cable screen can do such as progress bars, analog real-time display, string real-time display of functions can be easily accomplished on the ITVF85. The user can edit the software on the touch screen operating interface for human design.

Current mainstream one-way RFID touch technology has not been able to meet the rising technology requirements. ITAV in control products using WiFi technology, not only break the RFID technology in communication distance, communication stability limitations, increased general RFID touch screen can't be bidirectional control communications capabilities, a new generation of control host ITAV new 4-way E-BUS bus interface through E-BUS bus, supports Wireless WiFi control, and ITVF85 touch screen seamless bi-directional communication, bi-directional data exchange function. This makes it possible to live on the touch screen to see more and more honest feedback. For example, remote control of equipment open closed the running state. For example, using a projector's friends are aware of the projector lamp is a consumable, along with the growth of the working time, work environment, the lamp brightness will slowly darkening, many sections of the projector supports reading lamp with time and temperature, meaning that as long as the projector manufacturers expose this part of the distribution agreement, we will be intuitive by wireless WiFi dual touch screen to see the current projector bulb working hours and operating temperature, the use of equipment maintenance and control of life has a great help.

Wireless bidirectional control system support matrix ITAV unique feedback feature intuitive display in the control host, and touch screen, when the signal access, on the touch screen can direct feedback of the origin of the signal, allowing for control system, will be more convenient and reliable. Use WiFi wireless two-way benefits not only so, with E-BUS bus ITPBII-PRO-E and ITVF85 Wireless WiFi touchscreen, you can provide stable dual wireless control, giving users unprecedented control experience。

The main advantage of the WiFi is that it does not require wiring, can withstand wiring conditions, therefore very suitable for mobile users need to have broad market prospects. At present it has evolved from traditional healthcare, inventory control and management services, and other special industries to more industry expanding away and even started to enter the family as well as educational institutions, etc.
Health and safety is also a major attraction in WiFi. IEEE802.11 provisions of transmitter power is not more than 100 MW transmitting power, the actual about 60 ~ 70 MW, this is a kind of concept? mobile phone transmitting power of about 200 MW to 1 Watt, portable two-way radio up to 5 watts, and the wireless network uses is not like cellphone in direct contact with the human body, is absolutely safe.

The advantages of using WiFi, we can see some of the internationally renowned brands such as AMX, CREASTRON in nearly two years to launch a wireless WiFi controlled products in the series. However, domestic manufacturers but also has WiFi technology is not applied. ITAV it is in a market-oriented principle, relying on a strong professional development efforts, domestic pioneered owns full independent intellectual property rights of wireless WiFi control series products, but also introduced a performance superior to other products.