USB

Let’s take a look at the hierarchy of the system we are about to design:

  graph LR
    subgraph "DevBoard"
        subgraph "Front End"
            A2(LED)
        end

        subgraph "Back End"
            B2(Serial)
            C2(Callbacks)
            D2(Logic)
        end

        B2 --> C2 --> D2 --> A2
        D2 --> B2
    end

    subgraph "Computer (Python)"
        subgraph "Front End"
            A1(UI)
            B1(Alerts)
        end

        subgraph "Back End"
            C1(Callbacks)
            D1(Logic)
            E1(Serial)
        end

        A1 --> C1 --> D1 <--> E1
        D1 --> B1
    end

    B2 <--> E1

Now, I know this looks complicated, but we will tackle each block one by one, nice and slow.

Once you are done with this, you will have a solid understanding of creating systems involving bidirectional communication between 2 devices, which is super useful for a ton of applications (including your final project).

So let’s get started.