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)

Understanding SPI

SPI is a bus system that has a controller and one or many devices. The controller selects a device that should send data to the controller, or that is going to receive data from the controller.

Devices on an SPI bus can also be daisy chained together. A daisy chain is a wiring scheme in which you put multiple devices together in a row.

SPI communication between two devices uses the following four pins:

  1. CS: ChipSelect selects which device on the bus should receive or send data.
  2. CLK: Clock sets the frequency of the transfer (DO) and receive (DI) wires.
  3. DO: DataOut or DigitalOut transmits data to the receiving device.
  4. DI: DataIn or DigitalIn receives data from the controller.

The following diagram shows the one-to-one connection of an SPI controller and an SPI device:

Figure 6.12 – SPI communication

The following diagram shows the SPI connection of one controller and two devices. Here, we are using two...