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c15da

Tetrix USB Surge Protector Mount

by c15da Oct 24, 2014
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Nice design!

FYI, when I asked the lead technical FTC person at our state FIRST organization, he said that the Samantha has adequate internal ESD protection but the NXT does not. Given this, he said that the surge protector should be placed electrically close to the NXT to protect it and that having a surge protector by the Samantha is not necessary. So folks may want to consider mounting this part as close as possible to the NXT and use a very short USB cable between the NXT and the surge protector. Best of luck to all teams!

That's actually pretty interesting to hear, since in our experience last year most of our problems came from the Samantha rebooting and loosing connection when experiencing ESD. Either way, one of the reasons I made this is so that it is flexible, and because some of the designs I have seen here for mounting it are incompatible with the NXT mount.

I thought from the doc at the link below that the USB surge protector was now allowed specifically to deal with ESD-caused NXT lockups.
http://www.usfirst.org/sites/default/files/uploadedImages/Robotics_Programs/FTC/FTC_Documents_and_Updates/Addressing_NXT_Lockups.pdf
Other docs from FIRST seem to imply that Samantha drops are usually caused by connector problems or power supply drops, (e.g., "Strain Relief" in http://www.usfirst.org/sites/default/files/uploadedImages/Robotics_Programs/FTC/FTC_Documents_and_Updates/FTC_Samantha_Module_User_Guide.pdf and http://www.usfirst.org/sites/default/files/uploadedFiles/Robotics_Programs/FTC/Team_Resources/FTC_Robot_Wiring_Guide.pdf).
But you're welcome to put it wherever you think it will best serve your robot, of course!
It might also be cool to see an update to your NXT mount which also holds the USB surge protector near the NXT's USB port!