Internet of things, as per the name suggests internet plays the key role, and when it comes to internet the Wi-Fi module takes a larger share. Wi-Fi is one of the candidate technologies for IoT. This module has the ability to connect billions of people today. This module allows micro-controllers to connect to Wi-Fi network and make simple TCP/IP connections using commands.

The ESP8266 is a Wi-Fi module popularly used. The ESP8285 is an ESP8266 with 1 MiB of built-in flash, allowing for single-chip devices capable of connecting to Wi-Fi. ESP32 is the successor of these micro-controller chips.

Wi-Fi module is based on the IEEE 802.11 standards with native IP addressability.  This module scales well in terms of data rates to optimize for power consumption.  According to the Wi-Fi Alliance, there are more than 6.8 billion installed Wi-Fi-capable devices, so the odds are pretty high that there is a local Wi-Fi access point available. The 802.11 standards are also IPv6 compliant, so there’s almost no limit to the number of unique addresses. Wi-Fi module can work as both access point and station mode.

The ESP8266 Wi-Fi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your Wi-Fi network. The ESP8266 can either host an application or offload all Wi-Fi networking functions from another application processor.  Each ESP8266 Wi-Fi module comes pre-programmed with an AT command set firmware,  which means that you can simply hook this up to your Arduino device and get about as much Wi-Fi-ability as a Wi-Fi Shield offers . The ESP8266 module is an extremely cost effective board with a huge, and ever growing, community.

This module has a powerful enough on-board processing and storage capability that allows it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, including the front-end module. This front-end module is designed to occupy minimal PCB area. The ESP8266 supports Bluetooth co-existence interfaces; it contains a self-calibrated RF allowing it to work under all operating conditions, and requires no external RF parts.

Internet of things Wi-Fi module has many applications. Wi-Fi modules are basically used for remote controlling and monitoring, this ranges from the toy cars to TCP/IP and Wi-Fi coprocessor. Internet radio, camera, digital photo frame make use of this module. Medical and health care section also requires this module. Modern agriculture, military field and other wireless related secondary development applications are developed using the Wi-Fi module.

All the smart applications of IoT all over the world are possibly accomplished due the presence of the Wi-Fi module.

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