Book Image

Internet of Things with ESP8266

By : Marco Schwartz
Book Image

Internet of Things with ESP8266

By: Marco Schwartz

Overview of this book

The Internet of Things (IoT) is the network of objects such as physical things embedded with electronics, software, sensors, and connectivity, enabling data exchange. ESP8266 is a low cost WiFi microcontroller chip that has the ability to empower IoT and helps the exchange of information among various connected objects. ESP8266 consists of networkable microcontroller modules, and with this low cost chip, IoT is booming. This book will help deepen your knowledge of the ESP8266 WiFi chip platform and get you building exciting projects. Kick-starting with an introduction to the ESP8266 chip, we will demonstrate how to build a simple LED using the ESP8266. You will then learn how to read, send, and monitor data from the cloud. Next, you’ll see how to control your devices remotely from anywhere in the world. Furthermore, you’ll get to know how to use the ESP8266 to interact with web services such as Twitter and Facebook. In order to make several ESP8266s interact and exchange data without the need for human intervention, you will be introduced to the concept of machine-to-machine communication. The latter part of the book focuses more on projects, including a door lock controlled from the cloud, building a physical Bitcoin ticker, and doing wireless gardening. You’ll learn how to build a cloud-based ESP8266 home automation system and a cloud-controlled ESP8266 robot. Finally, you’ll discover how to build your own cloud platform to control ESP8266 devices. With this book, you will be able to create and program Internet of Things projects using the ESP8266 WiFi chip.
Table of Contents (20 chapters)
Internet of Things with ESP8266
About the Author
About the Reviewer

Testing the ticker

We are now going to configure the project, and we'll start by going into the details of the code for this project. Of course, you will find all the code for this book inside the GitHub repository for the book.

It starts by including the required libraries:

#include <ESP8266WiFi.h>
#include <ArduinoJson.h>
#include <Wire.h>
#include "SSD1306.h"

Then, we define on which pin the OLED screen is connected:

#define SDA 14
#define SCL 12
#define I2C 0x3D

We also need to create an instance of the LCD display:

SSD1306 display(I2C, SDA, SCL);

To grab the current price of Bitcoin, we need to use the Coindesk API. Therefore, we have to define the URL of the API in the code:

const char* host = "";

You also need to modify the code to set your Wi-Fi name and password:

const char* ssid     = "wifi-network";
const char* password = "wif-password";

In the setup() function of the sketch, we initialize the