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)

Building a safety lock using a keypad

We now know how to read input from a keypad and how to control a servomotor. We are going to use this knowledge to build a safety lock that opens when the correct passcode has been entered through the keypad. As we wrote libraries to control the servo and read data from the keypad, we only need to write the logic to check a passcode and light up LEDs. We are going to let the red LED blink each time a key is being pressed. When we enter a wrong passcode, we light up the red LED for 3 seconds. When we enter the correct passcode, we light up the green LED for 3 seconds and trigger the servomotor.

Building the circuit

We are going to reuse the circuits we built in the previous sections of this chapter. As we already have a servo and the keypad wired, we just have to add the LEDs and the resistors.

To build the final circuit, follow these steps:

  1. Connect a GND port from the Arduino Uno with the GND lane on the power bus.
  2. Place a...