@Walt_Holm et al.
Network loss due to draw from thrusters… Can anyone advice? Thanks
I’m mentoring a team of high school students competing for their third year as an underwater ROV team. We are trying to eliminate our network cable and so we got the Tenda pair and two interface boards from the OpenROV store and are able to stream IP cams to a surface laptop over a 100ft 12 gauge +ve/GND tether which powers the ROV with 12V and 20-25A. We pulled the resisters on the interface boards on both ends so that powering of the tether line is isolated from the powering of the Tendas, as instructed by the OpenROV support team. We are using Blue Robotics T100 thrusters with their Basic ESCs. These can pull up to 11.5A each. We use algorithms to make sure we don’t fully power more than 2 at once.
The problem is that when we power on a single thruster (even gradually) there is occasionally some temporary network packet loss (over 1-2s) - noticeable video frame drop/lag, and increased ping time. We haven’t yet hooked up the Raspberry PI controller. The indicator lights on the Tendas stay on.
As an A/B test, we connected a network cable straight from the laptop to the IP camera, while still powering the cameras over the tether, and this eliminated the issue, therefore the issue is definitely related to the network going over the tether in some way.
I assume the current draw or the power pulsing from the ESCs is throwing off the Tendas.
Is there a way to buffer this power draw and/or prevent the power pulsing of the ESCs to the thruster coils from affecting the Tenda connection?
Note that we are not allowed in the competition to use any on-board batteries, or voltage up-converters, but capacitors and voltage regulators are allowed.
Thanks for any help.