Losing connection when ramping over defenses
 

Has anyone else experienced this? I have checked and made sure that all of the wiring is good on our robot, yet every time we ramp over a defense (i.e. rock wall) and slam down, our robot drops connection. All wires are secured and locked in to their ports (power, ethernet, pwm, etc.)

Could this be a result of shock causing the radio/roboRIO to reboot?

If you have had this problem, please share your solutions.

Re: Losing connection when ramping over defenses
 

Check your main breaker to make sure it isn't bad. There are a couple each year... With the bad ones, you can tell by lightly tapping on the red button while watching the LED's on the robot - with a bad one they'll flicker.

My team's main breaker was bad, but in a different way- the lever inside that lets you turn it on was broken. Brand new, out of the box for may be a day. It was the only one I've seen broken like that. Fortunately, we had a few spares sitting around :)

Re: Losing connection when ramping over defenses
 

Double check that the fuses on the PDP are full inserted. They can look good but are actually far from fully mating. Are you getting just a very short (one or two seconds) drop or are you getting a radio reboot?

Re: Losing connection when ramping over defenses
 

We had this happen to us a few times Saturday during our first test drives over the defenses. We are going to do trouble-shooting this evening. I also saw another thread that described a similar (possibly the same) problem.

Re: Losing connection when ramping over defenses
 

It seems like a radio reboot, I'm just speaking from what the students have told me. It goes down for a good 30 secs.

I'll check the main breaker as well. Thanks guys.

Re: Losing connection when ramping over defenses
 

What do you learn from the driver station logs? http://wpilib.screenstepslive.com/s/...og-file-viewer

Re: Losing connection when ramping over defenses
 

We have been experiencing this exact same issue. When we go over the defences we drop connection. We have isolated the issue to the roborio. We're still trying to figure out how to fix it. We're currently trying to add suspension to our roborio and hoping that fixes it.

Re: Losing connection when ramping over defenses
 

What power plug in to the radio are you using? Wiggle it. If you do not get stable power, that might be your problem.

Re: Losing connection when ramping over defenses
 

I haven't personally seen any of the logs, but I can check when I get to the meeting this afternoon. Usually there aren't any errors from what I've seen, but I could be wrong.

Re: Losing connection when ramping over defenses
 

We had this happen last night too. The power connector for the radio came unplugged while going over the rock wall.

Re: Losing connection when ramping over defenses
 

We had very similar comms issues, which were solved by checking the fuses.

Re: Losing connection when ramping over defenses
 

Those minifuses are very good at pretending to be fully seated when they really aren't. My advice to teams for getting them in all the way:

• Push them in all the way.
• Let go and notice how they look like they're in all the way.
• Push harder. Literally until it hurts.
• Notice that they go in a lot more.

As a rule of thumb (!), if you can pull them out with your fingers they aren't pushed in hard enough.

Re: Losing connection when ramping over defenses
 

If your using a two speed transmission check to make sure your in low.

Re: Losing connection when ramping over defenses
 

Would you be able to post a video of how hard you guys breach?

Re: Losing connection when ramping over defenses
 

This leads to an interesting question: with all of the rough defenses, will bots have increasing comm problems during the tournaments as the systems get shaken up?