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WIFI wireless in smart home applications
Article Source:Xinrui Electronics  Visitors:1030  Time:2018-01-24

With the continuous development of science and technology, the local area network is gradually moving towards the direction of wireless and multi-network integration. In this rapid development of multi-network integration, WIFI is one of the most widely used wireless technologies A.

        

Currently, the smart home industry is also in full swing, it can be predicted that the future development of smart home, will no longer be confined to household appliances, lighting and other remote control, embedded smart terminals, wireless WIFI technology, and the Internet is bound to be Make home control more automated, intelligent and user-friendly, will change the traditional smart home mode, the smart home onto a fast-growing stage.

 

一:WIFI technology principle and application

        

WiFi Fidelity full name of WiFi, its biggest advantage is the higher transmission speed, up to 54Mbps, in addition to its effective distance is also very long, its main features are: speed, high reliability, open area, communication distance up to 305 Meters; In the closed area, the communication distance is 76 meters to 122 meters, easy to integrate with the existing wired Ethernet network, lower the cost of networking, Wi-Fi technology, the outstanding advantages are:

        

First, the radio coverage of a wide range of WiFi radius up to 100 meters, the office needless to say, that is, can be used throughout the building.

        

Second, the transmission speed is very fast, you can reach 11mbps, in line with personal and social information needs.

        

It has many advantages over wired networks:

 

No wiring required

       

The main advantage of WiFi is that it does not need to be routed and can not be limited by the wiring conditions, so it is very suitable for the needs of mobile office users and has broad market prospects. It has since expanded beyond traditional industries such as healthcare, inventory control and managed services to more industries and even into homes and educational institutions.

 

health and safety

       

Wireless network usage is not as direct contact with the phone as the human body, it should be absolutely safe.

 

Simple way to set up

        

General set up the basic wireless network equipment is a wireless network card and an AP, so will be able to wireless mode, with existing cable infrastructure to share network resources, set up the cost and complexity of the program is far lower than the traditional wired network. If only a few computers peer-to-peer network, but also not AP, only need to have each computer equipped with a wireless card. AP stands for AccessPoint, generally translated as "Wireless Access Node," or "Bridge." It serves primarily as a bridge between wireless workstations and wired LANs in the media access control layer MAC. With an AP, like a hub for a normal wired network, wireless workstations can be quickly and easily connected to the network. Especially for the use of broadband, WiFi even more advantages, cable broadband network (ADSL, cell LAN, etc.) to the home, connect to an AP, and then install a wireless card in the computer can be. An ordinary home has an AP is enough, even after the user's neighborhood is authorized, you do not need to increase the port, but also to share the Internet.

 

Work long distances

        

Do not look at the working distance of wireless WiFi is not large, the network construction is complete, the real working distance of 802.11b can reach more than 100 meters, and solve the data error correction, high bit error rate, WiFiI equipment and equipment , Switch between equipment and base station and safety certification have been well resolved.

        

All in all, the demand for mobile connectivity for home and small office network users is driving the growth of the wireless LAN market.

 

Two: Microchip WIFI product overview

        

Microchip's MRF24WB0MA and MRF24WB0MB are low-power surface-mount modules that conform to the 2.4 GHz IEEE standard 802.11 and contain all of the associated RF components - a crystal oscillator, bypass and passive biasing circuitry with integrated MAC, baseband, RF and power amplifiers , And built-in hardware that supports AES and TKIP (WEP, WPA and WPA2 security). The integrated module design allows designers to eliminate RF and antenna design tasks and compliance testing, ultimately reducing time-to-market. The MRF24WB0MA module is approved for use with an integrated PCB helical antenna. The MRF24WB0MB comes with a very small coaxial connector (U.FL) that is approved for use with a range of pre-certified antennas. The MRF24WB0MA / MRF24WB0MB module is designed to work with Microchip's TCP / IP software stack. The software stack integrates with drivers that implement APIs for commands and control in the module as well as management and packet traffic. The Microchip TCP / IP Software Stack is available for free download (including application examples and source code) from the Microchip Applications Library at the Microchip Technology website (http://www.microchip.com/wireless). The module, combined with the PIC running the TCP / IP stack, supports IEEE standard 802.11 and IP services. This will make the wireless web server instantly available. In the United States (FCC), Canada (IC) and Europe (ETSI),


        

The MRF24WB0MA / MRF24WB0MB modules are approved for regulatory approval of modular devices. Modular approval eliminates the need for expensive RF and antenna designs, allowing end users to place modules in finished products without the need for regulatory testing of artificial radiators (RF transmitters). Both modules are also approved by Japan's radio type approval.

 

Three: Microchip WIFI Product Features:

         

         ■ RF transceiver compliant with IEEE standard 802.11

         ■ The only serialized MAC address

         ■ Data rates: 1 and 2 Mbps

         ■ Compatible with IEEE standard 802.11b / g / n

         ■ Small size: 36-pin surface mount module 21 mm x 31 mm

         ■ Integrated PCB Antenna (MRF24WB0MA)

         ■ Optional external antenna with subminiature coaxial (U.FL) connector (MRF24WB0MB)

         ■ Range: up to 400 meters (1300 feet)

         ■ Easy to integrate into the final product - Accelerate product development and shorten time to market

         ■ Single operating voltage: 2.7V-3.6V (3.3V typical)

         ■ Temperature range: -20 ° C to +85 ° C (extended commercial grade)

         ■ Simple 4-wire SPI interface with interrupt

         ■ Working in the ISM band 2.400-2.484 GHz

         ■ 14 channels can be individually selected or domain restrictions

         ■ DSSS modulation

         ■ Data rate - 1000 kbps

         ■ Typical sensitivity at 1 Mbps is -91 dBm

         ■ Typical output power when using control functions is +10 dBm

         ■ Integrated low phase noise VCO, RF frequency synthesizer, PLL loop filter and PA

         ■ Digital VCO and filter calibration

         ■ Integrated RSSI ADCs and I / Q DACs allow the host to obtain RSSI readings

         ■ Balanced Receiver and Transmitter Features for Low-Power Applications MAC / Baseband Features:

         ■ Hardware CSMA / CA access control, automatic ACK and FCS creation and checking

         ■ MAC data packets are automatically retransmitted

         ■ Hardware Security Engine (AES and RC4-based encryption)

         ■ Support 802.1x and 802.1i security: WEP, WPA-PSK and WPA-2-PSK

         ■ Low current:

            - Receive (RX) Mode - 85 mA (Typ)

            - TX (TX) mode - 154 mA (+10 dBm? Typical)

            - Sleep - 250 μA (typical)

            - Hibernate - <0.1 μA (typ))


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