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)

Displaying user input on the display

In this section, we are going to print the input of a user onto the display. The input is being sent from the computer to the microcontroller using serial (UART), which will then print it onto the display.

In Chapter 2, Building a Traffic Lights Control System, we learned how to use UART to send messages to the computer, and observed them using PuTTY. Now, we are going to use this interface bidirectionally. For this project, we are using the same hardware setup that we used in the previous section, which means we can directly dive into the code.

Start by creating a new folder named hd44780-user-input inside the Chapter06 folder. Then, inside this newly created folder, add a new main.go file with an empty main() function inside it. The project's structure should now look similar to the following:

Figure 6.8 – Project structure

Follow these steps to implement the program:

  1. Save the hex value for...