Field Static Solutions

[Rob]

Hello All,

It was speculated that static build up and discharge from machines to the corner player stations (Airlocks?) could have cuased some field system issues at regional events this weekend.

The purpose of this thread is for people to discuss suggestions to prevent this in the future. lets share some of our ideas here.

I suggest that FIRST modify the trailer design to include a ground wire that drags on the floor under the trailer. The wire could be fixed to the trailer tounge where it extends into the trailer body. The wire would be under the trailer and not visible.

This would also create a uniform solution rather than asking teams to take chassis grounding into their own hands.

Any other thoughts?

Thanks, and good luck!

[Tottanka]

well, and what about driver stations?

[pacoliketaco]

Originally Posted by Tottanka

well, and what about driver stations?

There was an information sheet released awhile ago detailing how you should do this. it involved attaching a pwm cable to the bottom row of pins on the IO ports and attaching the other stripped ends to the closest screw.

as for the robot, we just bolted a piece of wire to the bottom of our robot. very easy fix, only took a few minutes.

[MrForbes]

Did any team with a non-metallic robot (wood, fiberglass, plastic, carbon fiber, etc) have problems with static?

[SuperBK]

I don't think the driver's station grounding wire is enough. It grounds the circuit to the case, but the case isn't grounded to anything. I think there should be a ground strap that clips onto the driver's station that's connected to an earth ground. Similair to an anti-static mat used when working on electronics.
Brian

[NorviewsVeteran]

I didn't have, nor hear about, any static problems at DC. Has anyone actually had problems with buildup, or are we discussing how to prepare against the pickle rebellion?

[synth3tk]

My team (964) bricked our station at the Buckeye regional, and there were a ton of other teams having issues with their system. The fix with the grounding to the casing worked, though.

Somewhat related, the Buckeye field controller used a cheap USB soundcard for the game sounds, and it was shorting out our system all-day Thursday. So lot's of static/ESD issues here.

[NorviewsVeteran]

Okay, thanks for clearing that up.

[Andrew Bates]

Well if you are Dean Kamen your "spritz" the field with water. At the NH regional the field operators were pouring bottles of water on field near the airlocks and Dean Kamen went around with a bottle of water spraying the airlock.

[Tom Bottiglieri]

Originally Posted by corpralchee

Well if you are Dean Kamen you "spritz" the field with water. At the NH regional the field operators were pouring bottles of water on field near the airlocks and Dean Kamen went around with a bottle of water spraying the airlock.

You mean like this?

http://www.youtube.com/watch?v=o8Mv9LYRNcY

[Al Skierkiewicz]

Midwest was lucky this weekend with a high humidity weather pattern. Static did not look to be an issue. However, a variety of other issues did plague us throughout the weekend.
Draging a ground wire, as pointed out above, can do nothing to drain charge. There is no direct conductive path to ground and the wire or chain does not provide a large enough surface to capacitively couple into the earth below the floor.
My suspicion is that the power connector on the gaming adapter is not made for vibration. A hard hit to the airlock or field border or even robot to robot, could potentially interupt the power connection. It may take some time for the adapter to start sending or reboot on bad collisions.

[EricVanWyk]

Originally Posted by squirrel

Did any team with a non-metallic robot (wood, fiberglass, plastic, carbon fiber, etc) have problems with static?

Squirrel -

I believe the issue is on the driver side, not the robot side. Robot A releases its energy to the field, but may impact any of the six.



For whatever reason, the FRP+rover wheel combination has some serious vandegraph potential.

[GBIT]

A though was brought up by some of our team...

Ground the DS box to the field table so that we don't have the issue...

There were times when our robot hid the airlock and killed the system hehe...

But i agree with rob a grounding strap on the trailer would be ideal....

[GRS]

Increase humidity to 60%. The water vapor in the air helps make static electricity harder to build up.

[Daniel_LaFleur]

Originally Posted by GBIT

But i agree with rob a grounding strap on the trailer would be ideal....

For a drag chain or grounding strap to discharge a static charge on a robot it would need to contact a conductive surface. Regolith is nonconductive. Please tell me how this will help.