In certain cases we need to use more than one Serial port in the case of arduino, I use the which has 4 serial ports including the programming port, in the case of arduino’s as the nano has a single programming port and as a solution Have created the softwareserial library, given the incompatibility of certain functions the softwareserial library for does not work on. Softwareserial LibraryI have tested with and SoftwareSerial library of the repository created or supplied by thanks for your contribution to the community. RecommendationsIn the case that these libraries that create a uart in code must be taken into account that at high speeds it is possible to have bit errors since they use interrupts and the microcontroller you are in many tasks at a time, in my case and the tests that I have I configured the port at Maximo 9600 Bauds, it is a relatively low speed but I consider it to be safe.

1. Esp8266 Serial Ports

Contents.Wiring the Arduino to the ESP8266As you know, the Arduino UNO, Mega or Nano doesn’t have any networking capabilities. To make the Arduino connect to the Internet, it needs a modem. The ESP8266 module will act as our modem, establishing a connection to your WiFi router in order to send/receive data to/from the web.The ESP8266 module, specifically the ESP-01 module, runs on 3.3 V. Thus, we must not connect the Arduino output pins to the ESP8266 pins directly. In the diagram above, I used a simple voltage divider to reduce the 5 V logic levels.

Also note that for the ESP8266 module to run correctly, it must have its own 3.3V, 250 mA power supply. This presents another disadvantage of this setup: you must have an extra supply instead of just using your computer’s USB port. AT CommandsNow that we’ve connected the ESP8266 module to the Arduino, it’s time to send out special commands through the Arduino’s (software) serial port.

This AT or Hayes commands are a set of commands not only used by the ESP8266 but also by other modems like, and.The whole list of AT commands is overwhelming. For our purpose, which is to connect to the Internet, we need only a specific set of AT commands.

A more thorough explanation of each command may be found on our. AT+CIPMUX = 1Enable single (0) or multiple connection (1) to the web server. Multiple connection is a good option if you are repeatedly sending out or reading data from the Internet.AT+CWMODE = 3Set WiFi mode: 1 is station mode (ESP8266 is client), 2 is AP mode (ESP8266 acts like a WiFi router where your phone or PC can connect), 3 is AP+station mode (make the ESP8266 do both)AT+CWJAP = “”,””Connect to your WiFi. Provide your SSID name and password inside the double qoutes.AT+CIFSRThis returns the IP address of the module, indicating that it has successfully connected to your WiFi router.AT+CIPSTART=0,'TCP','www.teachmemicro.com','80”Start TCP or UDP connection. Here, the first parameter (0) is the id of the connection, “TCP” means we’re using TCP instead of UDP, then followed by the address (or ip) of the web server then the port number.AT+CIPSEND=0,16Command to tell the module data is ready to be sent. “0” here is the connection id, and 16 is the length of the data to be sent. After this command, the ESP8266 will reply with the “” character to tell us that it will be waiting for the data to be sent.

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If successful, the module will reply with “SEND OK”“0” here is the connection id, and 16 is the length of the data to be sent. After this command, the ESP8266 will reply with the “” character to tell us that it will be waiting for the data to be sent. If successful, the module will reply with “SEND OK”.“Data to be sent”The string data to be sent.Note that these commands must be sent in correct order from the Arduino to the ESP8266 module.

Arduino WiFi Sketch ExampleUsing the AT commands above, we can now make a simple HTTP request that will retrieve a web page from a server. Here is the full sketch. Note that this is a very simple sketch that sends out AT commands in succession to establish a WiFi connection. We can improve this sketch further by waiting for the ESP8266 module to reply to each command, making sure that it really did receive the command. Send Data to a Web PageTo send data to be posted on a web page, we need a PHP script that will “catch” the data sent through the ESP8266 module.

Esp8266 Serial Ports

There are a hundred ways to do this, but this how I implemented it:On a server, I created a “read.php” file that contains this. You can name this file.php.

This page should refresh every 5 seconds, updating the value sent by the Arduino. That's It!Hopefully you’ve learn how to use Arduino with the ESP8266 module to connect to the Internet. Then again, I will still suggest that you use a NodeMCU if you're building a more complicated Arduino WiFi project.

The is very simple to use and contains a lot of example sketches that will make your work faster.But if you still insist in using the generic ESP8266 module, there is a way to use it with the Arduino core mentioned above without using an Arduino. However, that would be a separate tutorial so hopefully you’ll come back for that.