4 Hardware Components
The 3D printed housing is separated into different components and assembled into the final housing. These
components were designed for a Selective Laser Sintering process that uses Nylon 12 as the material. This
gives the button surface slight flexibility to bend and allows for the magnetic dial to rotate smoothly. The design
starts with a housing base that provides a rigid surface for the PCB to sit in as well as a hole for the USB cable
and multiple holes for the bolts to secure the housing shut.
Figure 4-1. Housing Base
The PCB rests inside the groove around the outside of the base along with the SCB attached.
Figure 4-2. Housing Base with PCB
The top cover is broken into multiple parts to make it easier to print with some 3D printing technologies. These
different parts are the button surface, a dial attachment, the dial, and a small cover for the top portion of the
PCB. The button surface has grooves on the top to show where a button press should occur and a hole in the
middle for the dial attachment piece to sit in. On the back, there are rectangular cutouts for the metal targets
to be added into. To obtain the best mechanical isolation, the button cover is adhered to the PCB as well as
bolted to the housing base. This portion of the design was built to match the button stackup design previously
mentioned.
Hardware Components
16
Inductive Touch and Magnetic Dial Contactless User Interface Reference
Design
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