Many years ago, I had thought of an ROV design. The objective of the ROV was to record high quality footage of the coastal underwater and in the meanwhile gather scientific information. I tried to base my design on already available parts.
To enable remote operation over a large area, I proposed the ROV to have two sections. A remotely controlled catamaran and an ROV attached to it. The catamaran would carry the battery pack, solar panels, GPS and a cellular communication module on board. Both bots would be operated by cellular network remotely. The solar panels would allow continuous operation. Utilizing a catamaran would shorten the tether of the ROV and allow it to cover larger areas.
As the communication between the catamaran and the ROV, I chose ethernet over powerline. This simplified the ROV’s tether so that both power and signal would be transmitted over two wires. I thought of using a coaxial cable as tether which would have some sort of buoyancy. I checked different powerline adaptors. Some worked down to 40 Volts. Therefore, 50V would operate the ROV motors and the powerline adaptor. I know that motors induce a lot of noise on powerlines. That was the tricky part of the problem. I didn’t have chance to solve it.
There would be a Wi-Fi controlled professional camera inside the ROV. It would be controlled by an Android installed pc module which would communicated above water via ethernet over powerline. The camera would be powered by the powerline as well. Negating the need for a battery. Additionally, there would be scientific sensors on board.
The buoyancy of the ROV would be controlled by a carbon dioxide filled cartridge and a bike inner tube. By releasing the pressurized gas into the inner tube, the ROV would be made to float. Exhausting the gas inside the tube made it sink.
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