Hi All,

I am working on my first PCB design, and hope that some of the knowledgeable people on here might be willing to have a look through my design and give some feedback. My goal is to learn more about schematics and routing while creating a fun little project, which I hope to manufacture, assemble and test while in Shenzhen in three weeks time. Due to this, components readily available on LCSC are used.

**The project**

What I am trying to build is a *space navigator,* a USB device that allows the user to manipulate a digital object in a 3D environment. The *Romdåsa* is a Norwegian play in this, roughly translating to “space tin”. These are popular among mechanical engineers and other professionals working with 3D modelling. There is really only one commercial manufacturer, [3DConnexion](https://3dconnexion.com/uk/spacemouse/), and while they make great tools I always thought the ergonomics of the navigator and buttons could be better - especially for a 400 € device that develops play with use. I have no delusions about actually creating a better or more practical product, but find it to be a good motivation to work in this project. There are also numerous open source DYI alternatives out there which more than likely would beat my design.

**The design**

The 3D positioning is solved by using three 3-axis magnetometers. These will be placed in a ring, with three magnets mounted to the manipulator the user moves around. The magnetometers are chosen based on some rudimentary simulations with commonly available magnets, such that I get reasonable changes in experienced field strength for changes from any position, avoid dead spots and never saturate the magnetometers.

All parts boxed in red and on page 4 are keys I plan to add later - these will not be part of the first prototype. Feedback is however still appreciated.

The STM32 MCU is chosen based on a devkit I happen to have available, and it seemed to be well suited for the task with excess capabilities. I am not looking to minimise the cost of every single component.

One thing to note is the [USB C connector](https://www.lcsc.com/product-detail/C2927038.html?s_z=n_USB-TYPE-C-018). I manually edited the symbol and footprint to merge the pairs of GND and VBUS pins, as four pairs of neighbouring but separate pads gave me some headaches with routing. This is why pins A/B 2/3 are missing. I hope I did not commit any high crimes doing this.

Any and all feedback will be highly appreciated!

[Schematics review request] 6 DoF USB navigator (First PCB)