I would like to control an rov with as few wires as possible between the controller at the surface, and the rov underwater. My thought is to have pulse signals generated at the surface using one aduino and another arduino at the rov that reads the pulse signals comining into a single input and interprets that signal as to which output to activate. Does anyone here have a better idea or can help this newbie?
Welcome to the forum
A web page on a PC at the surface to send commands via Ethernet to a webserver running on an Arduino in the ROV
Serial communications would need two wires ( edit - three if you want two-way communication) , if the water has enough conductivity a single wire two wires might be sufficient, using the water itself as the ground reference.
Not sure how effective WiFi would be underwater, sound can travel much farther but would have a slow data rate.
If you have any wire, for example even a tether to prevent loss, you are not very limited in how many wires you can run.
Before discussing signals, you should say whether you are depending on wires or not.
Ah, missed the ethernet part, was thinking WiFi instead of wired.
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Hi, @rickyidlett
Welcome to the forum.
Can you please tell us your electronics, programming, arduino, hardware experience?
This will help us with discussing your project.
Thanks.. Tom... 
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