The ESP8266-12E is an enhanced version of ESP8266-12, perfect peripheral circuits, enhanced impedance matching, signal output is better, both stability and anti-interference ability, have been greatly improved! ESP-12 for the previous choice of users, even if it has made the product does not matter, the enhanced version is fully compatible with the previous firmware, the pin on the basis of the ESP-12 added six IO ports, SPI port leads to develop more convenient, application More extensive!
The ESP8266 WiFi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any micro-controller access to your WiFi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor. Each ESP8266 module comes pre-programmed with an AT command set firmware, meaning, you can simply hook this up to your Arduino device and get about as much WiFi-ability as a WiFi Shield offers (and that’s just out of the box)! 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 run time. Its high degree of on-chip integration allows for minimal external circuitry, including the front-end module, is designed to occupy minimal PCB area. The ESP8266 supports APSD for VoIP applications and Bluetooth co-existence interfaces, it contains a self-calibrated RF allowing it to work under all operating conditions, and requires no external RF parts.