search

conorpp / u2f-zero

U2F USB token optimized for physical security, affordability, and style
Other
2.41k stars 202 forks source link

[Hardware] Key Ring Durability #25

Closed erichahn closed 7 years ago

erichahn commented 8 years ago

I've been having some issues with how much the keyring hole has been worn away. _mg_8665 _mg_8668 *I think we have the same key ring

I also lost C4 a while back. I blame heating the pad too long, my fault on that one.

martenwikman commented 8 years ago

I think it would be a good idea if the board was extended a little so the hole would have more clearance to the board edge. Hole should be plated and some VIAs inserted in the pad itself like the picture below ( picture stolen from https://blogs.mentor.com/tom-hausherr/blog/tag/pcb-mounting-holes/) image

jaredfolkins commented 7 years ago

Instead of modifying any design I used an aftermarket keychain solution for low friction. The wire is wrapped in plastic.

https://www.amazon.com/bayite-BYT-WKC-4INP12-Inches-Stainless-Keychains/dp/B01CLGTBFA

Works fine and the wear is not severe nor do I anticipate the device to fail or become lost because of the wear in the keyring hole.

YMMV

alleybeachelectric commented 7 years ago

Is there a 3d printable case that could be used to protect the PCB? If not, I don't mind creating one ;)

conorpp commented 7 years ago

Yes, although it might not be very good. Improvements/replacements welcome :) https://github.com/conorpp/u2f-zero/tree/master/hardware/case

rspeed commented 7 years ago

I wonder if something like Plasti Dip would be a good solution for this.

conorpp commented 7 years ago

Updated PCB to use a plated hole / via as suggested by @martenwikman