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 servomotor

As we are now able to read the input to the keypad, the thing that is missing to build a safety lock is some kind of motor. For that case, we are going to use an SG90 servomotor. As of the time of writing, the timings on the Arduino Uno are not accurate enough to completely control the SG90 servomotor, but that is not a problem for our use case. We are just going to move the servo in one direction, which is clockwise. Also, there is currently no official driver for the SG90 servomotor, so we are going to write our own!

Understanding SG90 servomotors

SG90 servomotors are controlled by Pulse Width Moduluation (PWM). Basically, the SG90 reads inputs in a 50 Hz period. During this period, we can tell the servomotor to adjust itself to a certain angle by setting a signal for a certain amount of time. The signal length is called the duty cycle. After the duty cycle, we wait for the rest of the period. Depending on the duty cycle (the pulse width), the SG90...