Wi-Fi模塊在物聯(lián)網(wǎng)設(shè)計(jì)中的應(yīng)用現(xiàn)狀和未來(lái)優(yōu)勢(shì)

　　一個(gè)無(wú)處不在的物聯(lián)網(wǎng)（物聯(lián)網(wǎng)）取決于無(wú)線連接，但有許多選擇無(wú)線，而不是每一個(gè)設(shè)備是IP尋址-物聯(lián)網(wǎng)的必備功能。更重要的是，射頻設(shè)計(jì)本質(zhì)上是困難的。很少有公司配備適當(dāng)?shù)募寄軄?lái)實(shí)現(xiàn)射頻和天線設(shè)計(jì)，甚至在完成時(shí)，保持最新的設(shè)計(jì)與最新的標(biāo)準(zhǔn)，并通過(guò)FCC遵守它是耗時(shí)的。

　　對(duì)于設(shè)計(jì)師來(lái)說(shuō)，有一個(gè)非常堅(jiān)實(shí)和行之有效的無(wú)線連接和物聯(lián)網(wǎng)選項(xiàng)。該選項(xiàng)是Wi-Fi和模塊的使用。此功能將解釋原因，提供了一些設(shè)計(jì)方案，討論即將到來(lái)的升級(jí)到IEEE 802.11協(xié)議，并展示了如何橋Zigbee Wi-Fi本地IP地址。

　　There are many wireless interface options， Bluetooth Low Energy （BLE）， ZigBee， Z-Wave， Wi-Fi and RFID， each with their own unique balance of power， range， data rates， mesh networking， interference immunity， and ease of use. However， some interfaces are not yet native-IP enabled， so cannot be addressed directly or exchange data with other devices and servers over the Internet. These then require a separate gateway， adding expense and complexity to the final solution.

　　This is where Wi-Fi stands out： it is based on the IEEE 802.11 standards with native IP addressability， is ubiquitous， well understood， and can scale well in terms of data rates to optimize for power consumption. According to the Wi-Fi Alliance， there are more than 6.8 billion installed Wi-Fi-capable devices， so the odds are pretty high that there is a local Wi-Fi access point available （Figure 1）。 Note too that 802.11 standards are also IPv6 compliant， so there’s almost no limit to the number of unique addresses.