Book Image

ESP8266 Internet of Things Cookbook

By : Marco Schwartz
Book Image

ESP8266 Internet of Things Cookbook

By: Marco Schwartz

Overview of this book

The ESP8266 Wi-Fi Module is a self contained System on Chip (SOC) with an integrated TCP/IP protocol stack and can give any microcontroller access to your Wi-Fi network. It is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor. This book contains practical recipes that will help you master all ESP8266 functionalities. You will start by configuring and customizing the chip in line with your requirements. Then you will focus on core topics such as on-board processing, sensors, GPIOs, programming, networking, integration with external components, and so on. We will also teach you how to leverage Arduino using the ESP8266 and you'll learn about its libraries, file system, OTA updates, and so on. The book also provide recipes on web servers, testing, connecting with the cloud, and troubleshooting techniques. Programming aspects include MicroPython and how to leverage it to get started with the ESP8266. Towards the end, we will use these concepts and create an interesting project (IOT). By the end of the book, readers will be proficient enough to use the ESP8266 board efficiently.
Table of Contents (15 chapters)
ESP8266 Internet of Things Cookbook
About the Author
About the Reviewer
Customer Feedback

Reading digital signals

One of the uses of the ESP8266's GPIO pins is to read digital signals. This allows you to control your project using input devices and also to monitor sensor data. In this recipe, we will look at how to read digital signals using GPIO pins.

Getting ready

Connect your ESP8266 board to your computer via a USB cable and set up your Arduino IDE (refer back to Chapter 1, Configuring the ESP8266). Once that is done, you can proceed to make the other connections.

In this recipe, we will need a few extra components. They include:

  • Breadboard

  • Jumper wires

Mount the ESP8266 board onto the breadboard and then connect a jumper wire from pin 5 to the GND pin. The connection should be as shown in the following figure:

How to do it…

We will configure pin 5 as an input, then read it using the digitalRead() function and display the state of the input signal on the serial monitor. This will be repeated every 1 second:

// LED pin
int inputPin = 5;
int val = 0;

void setup() {