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

Connecting your module to your Wi-Fi network

Now, we are going to check whether the ESP8266 and the Arduino IDE are working correctly, and connect your chip to your local Wi-Fi network.

To do so, let's perform the following steps:

  1. First, we need to write the code and then upload it to the board. The code is simple; we just want to connect to the local Wi-Fi network and print the IP address of the board. This is the code to connect to the network:

    // Import required libraries
    #include <ESP8266WiFi.h>
    // WiFi parameters
    constchar* ssid = "your_wifi_name";
    constchar* password = "your_wifi_password";
    void setup(void)
    // Start Serial
    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
    Serial.println("WiFi connected");
    // Print the IP address
    void loop() {

    You can simply copy the lines of the preceding code and then paste them into the ESP8266 Arduino IDE that you downloaded earlier. Of course, put your own Wi-Fi name and password in the code. Save this file with a name of your choice.

  2. Now, navigate to Tools | Boards and select Generic ESP8266 Module. Also, select the correct Serial port that corresponds to the FTDI converter that your are using.

  3. After that, we need to put the board in the bootloader mode, so we can program it. To do so, connect the pin GPIO 0 to the ground, via the cable we plugged into GPIO 0. Then, power cycle the board by switching the power supply off and then on again.

  4. Now, upload the code to the board and open the Serial monitor when this is done. Set the Serial monitor speed to 115200. Now, disconnect the cable between GPIO 0 and GND and power cycle the board again. You should see the following message:

    WiFi connected

If you can see this message and an IP, congratulations, your board is now connected to your Wi-Fi network! You are now ready to build your first projects using the ESP8266 chip.