![esp8266 serial port adapter esp8266 serial port adapter](https://i.ebayimg.com/images/g/9YkAAOSwUchaQmHK/s-l300.jpg)
Sometimes this is complicated, as in the case of Arduino UNO, once only for HW Serial "0" (pins 0 and 1) can work at that speed.
![esp8266 serial port adapter esp8266 serial port adapter](https://ae01.alicdn.com/kf/HTB1_WahL4YaK1RjSZFnq6y80pXac/5pcs-CH340-USB-to-ESP8266-Serial-Port-Wireless-Wifi-Module-Developent-Board-8266-Adapter-Board-Development.jpg)
In general, the module comes from manufactures speaking at a 115,200 baud rate. Well, the first thing you have to do is test the module with AT commands, which is the standard of communication. Until today, I only studied the ESP8266 connected to the Arduino, replacing the need for a relatively expensive Wifi shield (Shield, is a PCB that you install at a top of an Arduino to expand its capabilities). The above spec includes a lot of technical stuff that you do not really need in the great part of your projects, but it is good to have a hand "just in case".
ESP8266 SERIAL PORT ADAPTER HOW TO
In this This first tutorial you will learn how to set-up and test the module connected to an Arduino. This is the part 1 of 3 instructables to help you to use the ESP8266 with Arduino.