IoT protocols – Part 6 Wifi

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Following the series of articles on the protocols that electrical and electronics engineers need to know when designing IoT applications, today and you continue to learn about an extremely popular communication. and famous that everyone knows: Wifi.

What is Wifi?

Wifi (short for Wireless Fidelity or 802.11 network) is a wireless network that uses radio waves, just like cell phones, televisions and radios. Wifi connection is often the first choice of many solution engineers because of the commonality and economy of wifi and LAN systems with connection model in a limited geographical area.

The radio waves used for WiFi are similar to those used for handheld devices, mobile phones and other devices. It can transmit and receive radio waves, convert binary codes 1 and 0 into radio waves and vice versa. However, WiFi has some differences compared to other radio waves in that: They transmit and transmit signals at 2.4 GHz or 5 GHz. This frequency is higher than the frequencies used for mobile phones, handheld devices and televisions. Higher frequencies allow the signal to carry more data.

Currently, most wifi devices comply with the 802.11n standard, broadcast at 2.4Ghz and reach a maximum processing speed of 300Mbps.

Specification of Wifi:

+ Standard: Based on 802.11n (most common usage in homes today)

+ Frequencies: 2.4GHz and 5GHz bands

+ Range: Approximately 50m

+ Data Rates: 600 Mbps maximum, but 150-200Mbps is more typical, depending on channel frequency used and number of antennas (latest 802.11-ac standard should offer 500Mbps to 1Gbps)

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