Book Image

Developing IoT Projects with ESP32

By : Vedat Ozan Oner
Book Image

Developing IoT Projects with ESP32

By: Vedat Ozan Oner

Overview of this book

Developing IoT Projects with ESP32 provides end-to-end coverage of secure data communication techniques from sensors to cloud platforms that will help you to develop production-grade IoT solutions by using the ESP32 SoC. You'll learn how to employ ESP32 in your IoT projects by interfacing with different sensors and actuators using different types of serial protocols. This book will show you how some projects require immediate output for end-users, and cover different display technologies as well as examples of driving different types of displays. The book features a dedicated chapter on cybersecurity packed with hands-on examples. As you progress, you'll get to grips with BLE technologies and BLE mesh networking and work on a complete smart home project where all nodes communicate over a BLE mesh. Later chapters will show you how IoT requires cloud connectivity most of the time and remote access to smart devices. You'll also see how cloud platforms and third-party integrations enable endless possibilities for your end-users, such as insights with big data analytics and predictive maintenance to minimize costs. By the end of this book, you'll have developed the skills you need to start using ESP32 in your next wireless IoT project and meet the project's requirements by building effective, efficient, and secure solutions.
Table of Contents (18 chapters)
1
Section 1: Using ESP32
7
Section 2: Local Network Communication
12
Section 3: Cloud Communication

Communicating over UART

UART is an asynchronous communication technique in which parties use a predetermined data transmission rate or baud rate for communication. I2C and SPI are called synchronous because there is a common clock provided by the bus master, which is usually an MCU, and all other devices in the bus use this common clock to send/receive data. On the contrary, in UART communication, the parties have their own independent clocks and data transmission is achieved by the common UART settings in the applications running on the devices. Those settings or UART parameters are as follows:

  • Baud rate: This is the speed at which parties exchange data. For example, 9600 baud means 9,600 bits of data can be sent in a second.
  • A packet definition.

A packet definition shows the following:

  • The number of bits in a packet.
  • Whether the parity bit exists. Parity is to ensure that no bit is changed during the transmission.
  • The number of stop bits: 1 or 2...