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)

Using 4-digit 7-segment displays

A 7-segment display can be used for multiple purposes. One of them is to display times, which is exactly what we want to do in our final project. But how can we control them?

The 4-digit display has 12 pins: one pin for each digit (from 0 to 9), one pin for each segment, and a pin for the dot. So, to display anything, we have to send a high signal to the digit we want to set and then just set all pins to high, which we need to represent the character we want to display.

For instance, if we want to display the character of "1" in the fourth digit, we would set pin 4 and pins B and C to high.

To get a better understanding of this, take a look at the following diagram:

Figure 5.10 – A 7-segment display pinout

From the preceding diagram, you can see that pins 1 to 4 are being used to select the digit.

The 7-segment A-G pins are being used to control the segments and the dot pin is being used to set the...