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April 24, 2020 Why does the IoT Project Select WIFI Module?

The selection of WiFi module is an important part of adding WiFi to the design. Selecting the right module is the best starting point because it's critical to your design.


Typical application of WiFi module

In this case, WiFi can be seen as a way to achieve interoperability with other WLAN devices. WLAN refers to devices that conform to one or more IEEE 802.11 standards and can be used in a variety of scientific, industrial, commercial, and consumer applications. Many devices can use WIFI, and these devices can connect to network resources through wireless network access points.


See the parameters when select the WIFI module

Module makers usually classify modules based on parameters. Use these parameters to optimize your search according to the application specification. This is a very long list, and we encourage you to download the notes of selecting the WiFi module application to get the details of each parameter:

1.Protocol/standard support

2.Operating frequency band

3.Transmission range

4.Transmission power output, operating supply current or voltage

5.Data rate (maximum throughput)


7.Operating system(driver support)

8.Antenna and connector

9.Secure Wi-Fi Certification Program

10.Shape and size

11.Work temperature range

12.Package type

13.PCB layout


15.Real time clock, automatic sleep/wake, etc

16.Certification / compliance


You need to consider both hardware and software, because the WiFi module is a functional unit that can only be run in an embedded system. WiFi software should include a device driver, an integrated IEEE 802.11 security requester, and a full-featured management and monitoring utility. The hardware of the WiFi module consists of two main parts: the WiFi chip and the application host processor. This is the parameter data of Wenheng’s WIFI module C-322.



There are also trade-offs when choosing a WiFi module. The three key factors for evaluation are data rate, range, and power requirements. IEEE 802.11n and IEEE 802.11ac have higher data throughput advantages when comparing different WiFi protocols, while IEEE 802.11b/g has advantages in terms of compatibility and power consumption requirements.

IEEE 802.11n provides operational advantages such as higher data throughput, greater range and reliable link quality, and supports higher network utilization. 802.11ac provides twice the bandwidth of 600mbps over 802.11n based on high bandwidth in the extended range. It enables WiFi solutions to meet today's demand for high-capacity and high-quality mobile real-time applications such as video and voice. The use of multiple antennas (MIMO technology) increases data rate and range. However, the cost of these extended features is the use of multiple antenna structures, increased complexity of the BOM design, and the use of more power.


RF engineers and WiFi modules

We have been discussing the purchase of a WiFi module from a professional module company, which means that no RF engineers are required and we will provide professional technical guidance. Most manufacturers do not have the RF technology needed to make network equipment. However, some tasks, such as troubleshooting and customizing embedded modules for manufacturing, require some RF expertise. In these cases, you may need to hire an RF consultant or rely on the expertise of wireless LAN and RF test equipment manufacturers.

Select the WiFi module that best fits your design application, first carefully consider which WiFi module parameters will meet your needs, what trade-offs you will make in your selection, and which WLAN and RF equipment test equipment you will use. This is an important aspect of your consideration in building the Internet of Things.


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