We have provided Fusion 360 and STL files for 3D printing a case for the Mouse and Keyboard Emulator. They are available in our GitHub repository for this project here.

There is a base piece to the case complete with a receptacle for a 1/4"-20 Nut which can be used to mount the device for easy viewing. There are two versions of the lid. One has 2 alignment pins and 2 screw holes which can take M2.5 screws to hold the display module in place. The other version has 4 alignment pins and you can secure the display with a drop of glue. The pieces of the case snap fit and no glue or fasteners are required.

The video below illustrates how to assemble all of the parts.

Briefly, the steps are as follows…

3D print the case.

Connect the display board and the Trinkey together using a STEMMA QT cable. On the Trinkey board it is the white connector on top of the board. On the display board you can use either side. We use the one on the right when looking at the backside of the board.

Secure the display board into the lid of the case. Use M2.5 screws and nuts or use the version of the lid with pins only and put a drop of glue over each pin. We recommend hot glue because it can be scraped off if for some reason you ever need to disassemble the case.

Insert the 1/4"-20 nut in the base of the case and secure it with glue or tape.

Insert the Trinkey board into the base of the case with the USB A connector extending outward and the TRRS Jack aligned in the provided hole.

Snap the case together making sure that the wires are not being pinched. It is a snap fit with a latch at the top and bottom of the case.

Connect a USB extender cable to the USB connector and attach your switches to the device using the TRRS Jack. Details on the kinds of switches and adapters you may need are in the Parts List page of this tutorial.