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)

Chapter 3: Building a Safety Lock Using a Keypad

We gained basic knowledge of using LEDs, GPIO ports, and resistors in the last chapter. We also learned how to handle input and output. In this chapter, we are going to build a safety lock using a keypad. We will be able to input a passcode in the keypad that triggers a servomotor to unlock a lock. This will be achieved by splitting up the project into individual steps and putting it all together at the end of the chapter.

After working through this chapter, we will know how to write information to the serial port and how to monitor this information. This is a great way to easily debug an application. Then, we are going to write our own driver for a 4x4 keypad, which can be used as passcode input in our case. This 4x4 keypad can also be used as controller input, or as input to start different parts of a program. With that covered, we are going to write the logic to control a servomotor. Servomotors can be used as a lock mechanism...