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)

Monitoring input from a keypad

In this section, we are going to read input from a 4x4 keypad and print the pressed button to the serial port. Since TinyGo does not have a driver for this keypad, we will look at how to create a driver. This will help you understand the process and you can use this knowledge when you need to use other unsupported hardware.

As part of this exercise, I have also followed the process of adding this to the TinyGo codebase and it should be supported in the future. We are going to start by learning how to connect the keypad. Then we will move on to writing a driver, and then we are going to have a brief look at how new drivers are added to TinyGo.

Building the circuit

We start off by assembling the circuit. We are going to need a 4x4 keypad and eight jumper wires. Although we could use jumper cables to directly wire the keypad to the Arduino ports, we are going to wire it through a breadboard. We are going to add more components to this in the upcoming...