Build a Binary Clock with Elixir and Nerves: Use Layering to Produce Better Embedded Systems
- Length: 108 pages
- Edition: 1
- Language: English
- Publisher: Pragmatic Bookshelf
- Publication Date: 2022-09-06
- ISBN-10: 1680509233
- ISBN-13: 9781680509236
- Sales Rank: #737629 (See Top 100 Books)
Want to get better at coding Elixir? Write a hardware project with Nerves. As you build this binary clock, you’ll build in resiliency using OTP, the same libraries powering many commercial phone switches. You’ll attack complexity the way the experts do, using a layered approach. You’ll sharpen your debugging skills by taking small, easily verified steps toward your goal. When you’re done, you’ll have a working binary clock and a good appreciation of the work that goes into a hardware system. You’ll also be able to apply that understanding to every new line of Elixir you write.
Combining software with hardware can be frustrating, but you can become proficient in no time by taking a simple, logical approach. Blinking a single LED is the traditional “hello-world” of embedded systems. Building your own binary clock is the logical next step. It blinks groupings of LEDs based on the system time. This guide walks you through a working project using the techniques used by experts who build software for hardware every day.
This common sense project moves forward in tiny, logical steps. As you progress, you can verify each step before moving on to the next. You don’t have to be a Nerves novice to benefit from this project. Become a better Elixir programmer as you build your own desktop showpiece. With a layered approach to software design, you’ll learn to control the complexity of your programs the way the experts do by focusing on one small slice of your system at a time.
When you’re done, you’ll have your own binary clock, and also more of the tools you need to design and build your own Nerves and Elixir projects. You’ll also be a better programmer with a deeper appreciation of layering techniques for controlling complexity.
What You Need:
This project is for Elixir developers who want to get started with Nerves, or improve their skills. The project is designed for Elixir 1.11 and Nerves 1.7, but later versions will probably work as well with slight modifications. The project uses a Raspberry Pi zero with a set of components. With slight modifications, you can make this book work with other components as well.
Acknowledgments Frank Hunleth Bruce Tate Introduction How to Read This Book Building the Project Online Resources Part I. The Prototype 1. Our Plan Burn Firmware Make a Circuit Build a Program in Layers 2. Burn Firmware Choose a Computer Install Nerves Download and Install Firmware What You Built 3. Build a Circuit Build an LED Circuit Control the LED from IEx What You Built Part II. The Working Layered System 4. Blink an LED with Software Layers The Layers of a Nerves Project Initialize a Nerves Project from Scratch Build a Coreless Boundary What You Built 5. Build the Clock’s Circuit Plan the Hardware Prepare the Constant Current Driver Finish the Hardware Test the Hardware and Build the Cabinet What You Built 6. Write a Clock with a Core Write the Core Adapters Run One System, Three Ways Build the Service Layer What You Built 7. React to Change Order a Custom Binary Clock Chip Load the LiveBook Bringing up the Binary Clock PCB the First Time SPI Communication Simple Clock What You’ll Build Bibliography
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