Search found 9 matches
- Jan 30th, 2014, 5:56 pm
- Forum: Control Systems and Tethers
- Topic: watertight cat5 cable?
- Replies: 15
- Views: 9775
Re: watertight cat5 cable?
While researching for my towed side-scan sonar project I found a cheap source for stranded, individually shielded CAT6 cable at Black Box Network Services . $238 seems pretty good, most other places I checked wanted at least $800 and up for 1000'. I plan to thread this through 3/8" hollow braid...
- Apr 10th, 2012, 10:37 pm
- Forum: Frames, Hulls, & Bouyancy
- Topic: Achieving Large Depths
- Replies: 2
- Views: 2561
Re: Achieving Large Depths
Using acrylic resin to "pot" a camera is relatively common practice, as is using oil to fill electronics housings. The problem with your idea lies with the foam; regular eps foam compresses at depth, so the deeper you go the less flotation you'll have (it will also absorb water over time)....
- Mar 13th, 2012, 6:17 pm
- Forum: Control Systems and Tethers
- Topic: up voltage in tethers to reduce losses.
- Replies: 6
- Views: 2844
Re: up voltage in tethers to reduce losses.
JW Fishers runs 120 volts AC to their towed cameras for lighting through a GFCI box and it seems to work fine as I haven't been electrocuted yet. As long as the cable is properly sealed and you ground your system properly I foresee no problems.
- Dec 27th, 2011, 5:50 pm
- Forum: Introductions
- Topic: Hello from British Columbia
- Replies: 3
- Views: 1766
Re: Hello from British Columbia
System was originally planned around a laptop/joystick via USB extender to ROV setup, but cost and complexity has me rethinking to go with a microcontroller, probably an arduino.
- Dec 27th, 2011, 5:47 pm
- Forum: Electronics
- Topic: Electrolytic Capacitors under pressure?
- Replies: 1
- Views: 2256
Electrolytic Capacitors under pressure?
I was wondering whether anyone has had issues with electrolytic caps in your ROV's that are exposed to water pressure? I'm going to be using some large Capacitors in a power converter that I had planned to oil-fill to help with heat dissipation and to reduce the need for an additional heavy pressure...
- Nov 18th, 2011, 1:16 am
- Forum: Control Systems and Tethers
- Topic: Control Options??
- Replies: 4
- Views: 2334
Re: Control Options??
Nice find, that unit is very similar to the one I'd considered (http://www.icron.com/products/usb_new/usb20-ranger-2224-fiber-extender.php), even the price. The cost savings would be in the cable as the 1000' multimode fiber optic would cost around $600 versus around $150 for stranded CAT5. Somethin...
- Nov 16th, 2011, 6:43 pm
- Forum: Control Systems and Tethers
- Topic: Control Options??
- Replies: 4
- Views: 2334
Re: Control Options??
I had planned to use a Pololu Mini Maestro 24 USB servo controller at the ROV end to control the ESC's and Manipulator servos, it also can be used as a data interface for compass, pressure etc. All processing would be handled topside, the ROV's internal electronics would be very basic. The Optic lin...
- Nov 15th, 2011, 10:32 pm
- Forum: Control Systems and Tethers
- Topic: Control Options??
- Replies: 4
- Views: 2334
Control Options??
I've been working on a low-cost Search and Recovery ROV and have been working towards a PC based control via USB (optic) or RS-485. Reading through the forum it seems that this isn't a popular option which makes me think I may be making the system more complicated than it needs to be. I need a tethe...
- Nov 15th, 2011, 10:09 pm
- Forum: Introductions
- Topic: Hello from British Columbia
- Replies: 3
- Views: 1766
Hello from British Columbia
I've just recently found this board, have been working on a design for a Search/Recovery ROV for some time now. Lakes around here are up to 800' deep but most searches are at 200-400 feet. The electronics housings and flotation are solved, as is power and propulsion so tether length and control is t...