Book Image

Creative DIY Microcontroller Projects with TinyGo and WebAssembly

By : Tobias Theel
Book Image

Creative DIY Microcontroller Projects with TinyGo and WebAssembly

By: Tobias Theel

Overview of this book

While often considered a fast and compact programming language, Go usually creates large executables that are difficult to run on low-memory or low-powered devices such as microcontrollers or IoT. TinyGo is a new compiler that allows developers to compile their programs for such low-powered devices. As TinyGo supports all the standard features of the Go programming language, you won't have to tweak the code to fit on the microcontroller. This book is a hands-on guide packed full of interesting DIY projects that will show you how to build embedded applications. You will learn how to program sensors and work with microcontrollers such as Arduino UNO and Arduino Nano IoT 33. The chapters that follow will show you how to develop multiple real-world embedded projects using a variety of popular devices such as LEDs, 7-segment displays, and timers. Next, you will progress to build interactive prototypes such as a traffic lights system, touchless hand wash timer, and more. As you advance, you'll create an IoT prototype of a weather alert system and display those alerts on the TinyGo WASM dashboard. Finally, you will build a home automation project that displays stats on the TinyGo WASM dashboard. By the end of this microcontroller book, you will be equipped with the skills you need to build real-world embedded projects using the power of TinyGo.
Table of Contents (13 chapters)

Writing the driver

As we want to have reusable code, we are going to write a driver package for the keypad. The driver will provide an easy-to-use interface while hiding the more complicated implementation logic. Doing it this way, we can simply reuse the package in later projects even beyond the book. The official TinyGo drivers typically provide a constructor-like function that creates a new instance of the driver and a Configure function that takes care of initialization. We are also going to provide a similar API.

Just like in our previous projects, we are going to start by creating a new folder named controlling-keypad inside the Chapter03 folder. Then, we are going to create a main.go file with an empty main function. Also, we need to create a new folder named keypad and create a new file named driver.go, and then name the package keypad. Your project structure should now look like the following:

Figure 3.8 – Project structure for writing the driver...