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)

Controlling a pump

As pumps tend to draw more current than simple sensors, we are not going to power the pump directly through a GPIO port. Drawing too much current could permanently damage the Arduino. So, we will use an external power supply and a relay to power the pump. Before we start assembling the circuit, let's have a brief look at how relays work.

Working with relays

A relay that is used for microcontroller projects typically comes mounted on a board, which typically has six ports. It has three input ports: VCC, GND, and Signal. It also has three output ports: normally open, common, and normally closed.

When a high signal is given, the current flows between normally open and common.

When a low signal is given, the current flows between normally closed and common.

As we now know how to use a relay, we can continue to add the new components to our circuit. To do so, follow these steps:

  1. Connect the GND pin from the relay to GND on the power bus using...