The ESP8266 WiFi Module is a self-contained SOC with integrated TCP/IP protocol stack that can give any microcontroller 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.
ESP8266EX is among the most integrated Wi-Fi chips in the industry. Measuring just 5mm x 5mm, ESP8266EX requires minimal external circuitry and integrates a 32-bit Tensilica MCU, standard digital peripheral interfaces, antenna switches, RF balun, power amplifier, low noise receive amplifier, filters and power management modules - all in one small package.
ESP8266 PIN DIAGRAM-
ESP8266 PIN DIAGRAM-
VCC- 3.3v
RESET- either 3.3v or not connected
TX- transmitter of ESP8266
GND- 0v
GPIO2- not connected
GPIO0- 0v(while flashing) & 3.3v(after flashing is completed)
CH_PD - 3.3v(Always connect it to 3.3v after connecting battery and remove it after removing the battery)
RX- receiver of ESP8266
RX- receiver of ESP8266
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