Tecnología inalámbrica Zigbee, WiFi y 433MHz sus características

Tecnología inalámbrica Zigbee, WiFi y 433MHz sus características

Zigbee, Wifi y 433MHz son tres tecnologías diferentes para la comunicación inalámbrica de corto alcance. Cada tecnología tiene sus pros y contras.

Zigbee es una potencia baja, altamente confiable, Tecnología de redes de malla inalámbrica. Mediante el uso de los enrutadores, No solo el área de cobertura de red se puede ampliar y ajustar fácilmente, but also the “blind spot” in wireless communication environment can be eliminated. en adición, Zigbee supports star, tree and mesh topologies. Por lo tanto, Zigbee is well-suited for both simple and complex built environment. Compared to the WiFi, sin embargo, Zigbee’s data rate is 250kbps, lower than WiFi’s 11Mbps-54Mbps. That makes Zigbee inappropriate for high data rate applications, such as internet surfing, large file downloading or uploading. For restaurant and catering industry, sin embargo, the data exchanged between server and terminals generally are just small amount. Por lo tanto, Zigbee is a quite suitable technology for ordering application.

WiFi can support high-data-rate applications. It also supports “always-on” feature, which makes the WiFi attractive for some applications. Sin embargo, it has some drawbacks which have been noticed by the consumers, such as high power consumption, low reliability, long reconnection time, etc..

433MHz technology has been widely used in China for restaurant ordering application. Since it uses relatively low frequency band, its wireless signal can be transmitted further than Zigbee and WiFi, which operates in 2.4GHz band. Sin embargo, the data rate of 433MHz is only 9.6kbps, much lower than WiFi and Zigbee’s data rate. Por lo tanto, 433MHz suits the application in which only small amount of data needs to be transmitted. en adición, same as WiFi, 433MHz supports star topology only, which may cause “blind spot” within the wireless network coverage area.

Different from the WiFi’s “always-on” feature, in Zigbee and 433MHz system, the wireless link is established only when there is data need to be transmitted. This mechanism can dramatically reduce the interference to other devices in the network. The power consumption of the device is also reduced. Sin embargo, If “always-on” is requested in Zigbee or 433MHz system, a function can be designed in the application software to support this feature.
(Fuente: Tarjeta inteligente Co., Ltd. de Shehzhen Seabreeze)