The cases for the key fobs were created using the free version of SketchUp.  Click the green button below to download all the SketchUp files used in this project.

A gender cut out affords space for a translucent insert to be illuminated by the built-in NeoPixel of the nRF52840 board mounted to the underside of the cover. There are sections to hold all the other components.  The 2 halves of the case snap together and are secured with 4 M2.5 screws. The top is 3D printed in blue PLA and the gender icons in white. The icons are glued in place with #16 fast setting clear acrylic cement which works great on PLA.

All the component wiring is soldered. 26 AWG wire with PTFE insulation is used for the data connections. I prefer the PTFE which is more commonly known as Teflon because the insulation is very resistant to heat so it does shrivel up during soldering. A thicker 20 AWG wire is used between the speaker and the amp. It’s best to keep the data wires between the Feather and the amp as short as possible.

This guide was first published on Jul 22, 2020. It was last updated on Feb 26, 2024.

This page (Key Fobs) was last updated on Jul 16, 2020.

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