After the smart phone, more and more smart products have poured into our work and life. After the traditional devices are smart, the hardware has the ability to connect to achieve the loading of Internet services. Users only need to use WiFi and Bluetooth in the smart phone. Can control the equipment. This article SKYLAB Jun takes the wireless printer application based on the serial port WiFi module as an example to introduce the specific application of the WiFi module in smart hardware in detail.
There are two types of wireless printing:
One is that the wireless network card of the PC is directly connected to the WiFi hotspot of the printer;
The second is that the wireless network card of the PC is connected to the wireless router; the first is that the computer can directly print to the printer without wireless routing and Internet access; the second is that all computers under the same wireless router can use this printer Wireless sharing.
If you are a mobile phone, you need to download the mobile phone APP application, there is a QR code on the printer to scan and download the application. Use WiFi to connect to the WiFi hotspot of the printer first, and open the APP to select the file for printing.
Serial WiFi module
There are two working modes for the serial wifi module: AP and STA. AP is a hot spot, which means that it can radiate a wireless wifi network as an AP mode. STA is a site mode and a client mode, which is like our computer. Connected to a router, he acts as a computer. The WiFi module in the wireless printer is the AP mode, and the wifi module works in the AP mode. Smart terminals (mobile phones, tablets) directly access the network provided by the wifi module, and realize wireless control in the same hotspot network.
AP WiFi module SKW71 / SKW72
SKW71 is a WiFi module that complies with 802.11 n / b / g as a wireless network standard, and a USB interface is designed to specifically provide enhanced WiFi performance.
The chip AR9331 used by SKW71 has a new architectural feature: it integrates a CPU and a memory capable of running more WiFi functions on the chip. The integrated CPU can offload the overhead from the host device in wireless processing, so that consumer electronic devices can perfectly support the WiFi function without changing the original host processor.
SKW72 WiFi is a module that conforms to the 802.11b / g / n wireless standard. Its low power consumption and high AP integration characteristics make it widely used in consumer electronic devices, and it is provided by a voltage of 3.3V!
The main chip of SKW72 is AR9331, dual-channel PA and LNA are integrated inside the module! Under the 802.11n standard, 20Hz, its rate reaches 72Mbps; under the 802.11b / g standard, 40Hz, its rate reaches 150Mbps! This module supports AP mode, client mode and routing mode!
Applicable scene:
Widely applicable to a variety of gateways, set-top boxes, game consoles, printers, IP cameras, etc. These host processors cannot initially be used for WiFi-enabled products, more WiFi module application selection can directly access SKYLAB official website or Tiangong measurement and control Ali shop.
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