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 5: Building a Touchless Handwash Timer

In Chapter 4, Building a Plant Watering System, we learned how the ADC interface works, and we used that knowledge to write libraries for a capacitive soil moisture sensor and a water level sensor. We also wrote a small library to control a buzzer and learned how relays work and used that knowledge to control a pump using our code. Then we used all this knowledge to build an automated plant watering system.

In this chapter, we are going to build a touchless handwash timer. After working through this chapter, you will know how ultrasonic sound sensors work and how to measure distance with them. We are going to utilize this knowledge to create a sensor that recognizes a hand that is between 20 and 30 centimeters away from the sensor to start a timer. The timer will then be displayed on a 7-segment display. While implementing this, we will also learn about the MAX7219 chip and how to use it to control different display types.

In this...