Communications are finicky

[TheFlash]

@rich.varone

Hello,
thanks for replying what post in the thread is this discussion located at? I was looking for it, but to no avail, as I could not find it.

Thanks.

[TheFlash]

@AriMB

My problem still happens on multiple different robots with different batteries in them. Could this still mean that the brown outages could be the cause of my overall problem? or is it more likely to be a different problem? Thanks!

[AriMB]

It’s possible if you have loose battery lugs on multiple batteries then that could be causing your problems. Or if multiple batteries are damaged or start out undercharged, then that could also cause it. All of the connections between the battery and PDP should be tight enough that you can’t move them by hand. Fully charged batteries should be >12.5V resting (before the robot is enabled), and shouldn’t drop significantly when a small load is placed on them. If you have a Battery Beak or other resistive battery tester, this would be a good time to check that all of your batteries are in good health and fully charging.

Edit:
I saw in your other thread the log with all of the brownouts. That looks like a classic case of low batteries/loose connections. Checking the logs you posted here again, the voltage doesn’t drop low enough to cause brownouts but hovers at a less-than-fully-charged level for the whole time. I’d make sure you are fully charging your batteries before putting them on the robot.

[rich.varone]

FRC 95 The Grasshoppers 2019 Build Thread

So we’re seeing something similar where it looks like the robot is being disabled for 1-500ms at a time as well, which is evident by the robot getting very jerky, and it might be my imagination/poor memory but I’m almost 100% sure I’ve seen the DS flash to disabled then back to enabled but our robot code never sees this and when this happens and we also seem to see higher packet loss. Now something to note, we don’t use the WPI lib/hal at all, and use the CTRE lib with Phoneix_No_WPI, and it ha…

FRC 95 The Grasshoppers 2019 Build Thread

We’ve also been having weird issues that look like CAN or network problems as well as we’ve seen watchdog errors sometimes, we don’t know if it’s related or not but we’ve noticed that for some reason our packet loss has gone way up after flashing our robots to the 2019 RIO and and radio images. We haven’t had enough time yet to try going back to the 2018 images to see if it remedies our connection issues. Any chance your driver station reports packet loss?

We have a very unique software setup though, so I’m still unsure if it’s related to the issues your seeing.