You don't need a router or switch. Give each of the two RPis a static IP address and join them with an ethernet cable. (Doesn't even need to be a crossover cable as the RPis have autosensing interfaces.) With a switch you can easily connect a laptop to gain access to the otherwise closed system. Th...

Why use a homeplug? CAT5 ethernet is good for 100m (~328ft) run that with a PoE HAT on the remote RPi. Whatever you do get a small 100Mbps ethernet switch at the surface to join everything together. The HomePlug can extend the range to 300 meters. Besides, it should behave the same, and it makes th...

As mentioned, we are not intending to use WiFi, it's useless through water. I also did mention at the end our hope is depths beyond 100 feet - the ROV has been successfully tested to a depth of 30 feet. I am hoping to just get a system working on land that is possible to get working underwater, and ...

If you have a 50 foot USB extension cable, it has to have some active elements in it (or it converts USB to some other protocol and converts it back at the other end). This is why we were hoping to replace the USB cable with Ethernet as well. You mentioned it would be helpful to have a router - wou...

Hello, I am working on an ROV project where we are required to use a wired tether to communicate with the Raspberry Pi which is mounted to the ROV. We have to use a Pi since we need to receive video from a USB Webcam, and we are hoping to stream that video back to the surface while receiving simple ...