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 buzzer

We are going to write a very simple buzzer library. We only want the buzzer to make any sound, regardless of the pitch. We start off by adding the buzzer to the circuit. To do so, follow these steps:

  1. Connect D4 from the Arduino to A31 on the breadboard using a jumper wire.
  2. Use a 100 Ohm resistor to connect E31 with G31 on the breadboard.
  3. Connect the VCC pin from the buzzer with J31.
  4. Connect the GND pin to GND on the power bus.

The circuit should now look like the following figure:

Figure 4.11 – Buzzer – image taken from Fritzing

As we have now added the buzzer to the circuit, we can now start to write our library.

Writing a buzzer library

The buzzer library will have two functions: Configure(), which sets up the pin, and the Beep() function, which will make the sound.

We start off by creating a new folder named buzzer inside the Chapter04 folder. Inside the new folder, create a file named...