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)

Putting it all together

In our final project of this chapter, we are going to make use of everything we have learned in the preceding sections. We are going to use the ultrasonic distance sensor to recognize a hand movement in close proximity to the sensor. We are using the 7-segment display to count down from 20 to 0 and we are going to use a buzzer, to provide an additional signal, for the timer start and the timer end. In Germany, it is officially recommended that we wash our hands for at least 20 seconds, which is why we will also add a timer for 20 seconds. Putting all of this together, we will create a touchless handwash timer.

Before we start to write the code to control the hand wash timer, we need to add a buzzer. We can add this by following these steps:

  1. Put the GND pin of the buzzer in D53 and the VCC pin of the buzzer into D54. If that is too close together for your buzzer's pins, just put the buzzer in and wire the following two wires accordingly.
  2. Connect...