Using Wi-Fi modules - Part 1

Using wireless technology for connecting to external world is the trend. Gone are the days where people used those Ethernet cables which didn't allow people to move around while browsing and other activities. Now it is very common that you see more tablets, smartphones, mini PCs and even desktops connected using wireless technologies. PCs use wired Ethernet and Wi-Fi for connectivity whereas smartphones rely on Wi-Fi and GPRS connectivity. So, Wi-Fi is one of the common mode of connectivity whether it be any media. So, when you are planning to use Wi-Fi module in your application it is always important you make a right choice of the module you are using.

To those starters, you have to know that a Wi-Fi is enabled in your device using a transceiver chip which has an antenna connected to it. The antenna acts as a transducer and helps in communicating to external world.

What need to be looked at when you are choosing a W-Fi module?

• Encryption type in the module
• WEP, WPA, WPA2 types
• Wi-Fi standard
• IEEE802.11a/b/g/n
• Supports point-to-point or access point connectivity
• Cost perspective
• Range
• In-built antenna present or not
• TLS (Transport layer security) support
• Form Factor
• Can have a web server or not? (HTTPS support)
• Interfacing to controller (UART/SPI/SDIO)
• Operating temperature
• Physical contact of the Wi-Fi module with the mother board
• Certifications
• Power consumption
• Customer support of the vendor
• Module dimensions