I am planning an ROV build project. Planning on making various aspects of this project an educational experience for my kids.
My goals are:
- expose them to a wide variety of physics
- keep the materials price low
- make the project relatively simple
I have been reading up on a lot of different design ideas. The attached image is what I think is the most reasonable way to achieve my goals (for a 100 ft max fresh-water dive).
Here is a diagram of the electrics / electronics:
yellow vertical line separates items in the boat v.s. items on the ROV
other lines indicate wires
Open questions in my mind:
Will CAT 5E transmissions work well for the distances discussed?
o 100 ft USB->ethernet->USB extension cable
o 100 ft 12volt transmission for motor power (from a car battery in the boat)
o 100 ft timing for usb operation of Webcam, and controller
Do I need a separate, higher gauge line for 12volt electrical (for propulsion)? Or should I find an unused couple of wires in the CAT 5E cable?
I assume that PWM control is far better than on-off switches for the navigational motors (in terms of operational accuracy)
I assume a cheap servo that I waterproof is the cheapest way to operate the claw (even if that means replacing the servo every now and then when it finally gets water logged.
instead of the PWM controller, I could instead use an Arduino or a Rasp PI…
some programming is required to control the propulsion and grabber servo via the laptop
FWIW: I was thinking about using something like the basic Sea Perch design for the structure of the vehicle.