Part 2
The Working Layered System

With a foundation in place, we’ll pick up speed. The next few chapters will build the critical layers of the clock. We’ll start with a boundary, an OTP server responsible for working with hardware. Then we’ll build the circuits of the clock, wiring up the different LEDs and connecting them to componentry that will ensure that they all light at the same intensity.

Next, we’ll build out a core that lets us describe the lights in code, given a time. We’ll make some final tweaks to ensure reliability and set the time using some local libraries. The new clock will be ready for display.

Finally, once you have a fully working project, your fun is only beginning. This final chapter gives you the chance to use what you’ve learned. You’ll practice your new skills by building a binary clock based on a custom-printed circuit board.