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 to the serial port

An easy way to debug your programs on a microcontroller is to write messages to the serial port. You can later use this technique to debug your program, by printing the current step or sensor values, for example.

Let's write a small program to see how writing to a serial port is done. We start by creating a new folder named Chapter03 in the project directory, and inside this new directory, we create another directory named writing-to-serial. Now we have to create a new main.go file and insert an empty main() function. The folder structure should now look like the following:

Figure 3.1 – The folder structure for writing to serial port

Now, follow these steps:

  1. We print the word starting followed by a space and print the word program followed by an \n:
    print("starting ")
  2. We endlessly loop, print Hello World, and sleep for a second:
    for {