The ESP8266 UART Module is customised to directly interfacing with UART Pins of Microcontroller/ Arduino Board. It can directly test via sending of AT command from microcontroller or Arduino boards. you have just connect the given pins using 4 pins given at ESP8266 UART Module.
The ESP8266 is a low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller capability produced by Shanghai-based Chinese manufacturer, Espressif Systems. The chip first came to the attention of western makers in August 2014 with the ESP-01 module, made by a third-party manufacturer, Ai-
- Tx- to connect with Rx pin of microcontroller/ Arduino
- Rx- to connect with Tx pi of microcontroller/ Arduino
- Vcc- +5VDC
- GND- GND