Arduino ESP8266 Internet of things

Sending an email by Arduino

SMTP server overview

Simple Mail Transfer Protocol (SMTP) is a protocol for sending email messages between servers. Most email systems that send mail over the Internet use SMTP to send messages from one server to another, as well as to deliver messages to local mail clients like Microsoft Outlook or Apple Mail.

An SMTP server is a computer or application that is responsible for receiving, forwarding, and delivering email messages. When an email is sent, it is first sent to an SMTP server, which then forwards it to the recipient’s email server. The recipient’s email server will then deliver the email to the recipient’s mail client.

An SMTP server typically listens on port 25 for incoming email messages, however, many email providers use different ports or different security protocols, such as STARTTLS or SSL/TLS.

An SMTP server can be configured with different settings and options, such as the server’s hostname and IP address, the domain name, the email address of the administrator, and the maximum number of recipients per message.

Some popular SMTP servers are:

  • Postfix
  • Exim
  • Sendmail
  • Microsoft Exchange Server
  • Google G Suite
  • Amazon SES

It is important to mention that an SMTP server requires an email account and the appropriate credentials to send an email, also it requires the recipient email server to be able to receive the message, otherwise it will be rejected.

Purpose of this tutorial:

The Arduino is a popular microcontroller board that can be used to create a wide range of projects, including sending and receiving email. This can be accomplished by connecting the Arduino to a device such as an ESP8266 or ESP32 Wi-Fi module, which can be programmed to send and receive email using the Simple Mail Transfer Protocol (SMTP) and Post Office Protocol (POP) protocols.

There are a few different libraries available that can be used to send and receive email with an Arduino and an ESP8266 or ESP32 module, such as ESP8266Mail and ESP32Mail. These libraries make it easy to send and receive email by handling the low-level details of the SMTP and POP protocols, and provide a simple API for sending and receiving email.

To send an email with an Arduino and an ESP8266, you will need to connect the ESP8266 to the Arduino and then write a sketch (program) that uses the ESP8266Mail library to send an email. The sketch must be configured with the correct email server settings and credentials, and then it can be used to send an email with the desired message and recipient.

The process for receiving email is similar, it requires a sketch that uses the ESP8266Mail library to check for new email and retrieve them.

It is important to mention that sending and receiving email with an Arduino and ESP8266 is not the most efficient way to accomplish this task, it is recommended to use a fully-featured device such as a computer or a smartphone. However, it can be a fun and educational way to learn about networking and email protocols.

In this tutorial we will send an email with the Arduino board when a push button is pressed.

First, we must use an SMTP server which allows to send an email by the Arduino board.

Then, we must have the ESP8266 wifi card which allows you to connect the Arduino card to the Internet by wifi.

Necessary components:

The Arduino UNO is a microcontroller board based on the ATmega328P microcontroller. It is one of the most popular and widely used boards in the Arduino family. The board features 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, and a power jack.

The Arduino UNO can be programmed using the Arduino IDE (Integrated Development Environment), which supports a variety of programming languages, including C++ and Arduino’s proprietary language. The Arduino UNO can be used to control a wide range of devices and sensors, such as LEDs, motors, and sensors, and can also be used to communicate with other devices and services over the internet.

ESP8266 wifi

The ESP8266 is a low-cost Wi-Fi microcontroller module that can be used in conjunction with an Arduino to create Internet of Things (IoT) projects. The ESP8266 can be programmed to connect to a Wi-Fi network, send and receive data over the internet, and interact with other devices and services.

To use the ESP8266 with an Arduino, the ESP8266 module must be connected to the Arduino’s pins and then programmed using the Arduino software development environment (IDE). The Arduino IDE supports a variety of programming languages, including C++ and Arduino’s proprietary language.

Once the connection is established, the Arduino can then send and receive data over Wi-Fi using the ESP8266. This allows the Arduino to connect to the internet and interact with other devices or services, such as sending sensor data to a cloud service or receiving commands from a smartphone app.

There are libraries available for the ESP8266 that can be used to easily connect the ESP8266 to a Wi-Fi network and send and receive data over the internet. The ESP8266WiFi library is one of the most popular libraries for connecting the ESP8266 to a Wi-Fi network, it provides a simple API for connecting to a network, sending and receiving data over the internet.

Overall, using the ESP8266 with an Arduino is a great way to add Wi-Fi connectivity to your projects and create IoT projects. The ESP8266 is a low-cost and easy-to-use module that can be easily integrated into Arduino projects, which allows for a lot of possibilities to create IoT projects.

5V/3.3V power supply module

A 5V/3.3V power supply module is a device that converts a higher voltage, typically 12V or 24V, into a lower voltage, usually 5V or 3.3V, which is required by most microcontrollers and other electronic devices. These modules are commonly used in projects that involve microcontrollers like the Arduino and Raspberry Pi, as well as in IoT and other electronic projects.

THE 5V/3.3V power supply module is particularly important when using the ESP8266 Wi-Fi module, as the ESP8266 requires a stable 5V power supply in order to function properly. The ESP8266 is a 5V device and using a power supply that is not providing the correct voltage can damage the device or cause it to malfunction.

Push button

A push button, also known as a momentary button, is a type of switch that is activated when a user presses and releases the button. Push buttons are commonly used in electronic projects as a way to input a command or signal to a microcontroller or other electronic device.

Push buttons typically have two states: “on” and “off”, and they can be connected to a microcontroller or other electronic device using a digital input pin. When the button is pressed, it completes the circuit and sends a signal to the microcontroller, which can then take a specific action, such as sending an email .

Test plate

A test plate, also known as a prototyping plate or a breadboard, is a device that is used to build and test electronic circuits. It provides a convenient way to connect components such as resistors, transistors, and LEDs, without the need for soldering.

Connecting wires

Connecting wires are used to connect electronic components in a circuit. They are typically made of copper and are coated with insulating material to prevent electrical contact between the wires themselves or between the wires and other conductive materials.


To perform the assembly, you can connect:

  • The RX pin of the ESP8266 board to pin 4 of the Arduino board

  • The TX pin of the ESP8266 board to pin 3 of the Arduino board

  • The GND pin of the ESP8266 board to the GND of the Arduino board

  • The two pins 3V3 and EN of the ESP8266 board to the 5V pin of the power supply module

  • The RST pin of the ESP8266 board to pin 8 of the Arduino board

  • the first leg of the push button to pin A0 of the Arduino board

  • the second leg of the push button to GND of the Arduino board


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