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Old Oct 27, 2010, 10:46 AM
R.O.V. Man
hargard's Avatar
Devon UK
Joined Jan 2006
351 Posts
Discussion
Control Types

Hi
I have been making hobby RoV's for some time now and I am now on number 5.
My first one used a standard radio control with the receiver aerial extended to the surface. This worked well and was easy to setup.
The only downfall was that I had issues setting the ESC's up. I.E. moving the stick from centre to the limits to set the ESC's.

My number two was controlled with a Atmel chips talking RS422 to each other. I programmed them with Bascom which was easy to program.

My number three was controlled also with Atmel chips but control was much better and I had auto depth control.

My number four used a pair of off the shelf servo control boards.
These were not ant good at controlling ESC's and never made it into the water.(the only real failure that I have had).

My number five is also with off the shelf boards and are very good.
This RoV has auto depth, OSD display, Tilt & Pan, and spare channels if wanted.

BTW I also own a VideoRay Explorer.

Regards Antony(UK)
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Old Oct 27, 2010, 01:23 PM
Metallica
robe_uk's Avatar
Londonderry UK
Joined Nov 2004
417 Posts
Quote:
Originally Posted by hargard View Post
Hi
I have been making hobby RoV's for some time now and I am now on number 5.
My first one used a standard radio control with the receiver aerial extended to the surface. This worked well and was easy to setup.
The only downfall was that I had issues setting the ESC's up. I.E. moving the stick from centre to the limits to set the ESC's.

My number two was controlled with a Atmel chips talking RS422 to each other. I programmed them with Bascom which was easy to program.

My number three was controlled also with Atmel chips but control was much better and I had auto depth control.

My number four used a pair of off the shelf servo control boards.
These were not ant good at controlling ESC's and never made it into the water.(the only real failure that I have had).

My number five is also with off the shelf boards and are very good.
This RoV has auto depth, OSD display, Tilt & Pan, and spare channels if wanted.

BTW I also own a VideoRay Explorer.

Regards Antony(UK)

We want pictures and details lol

number 5 sounds where i want to get to so more info pleeeease
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Old Oct 27, 2010, 07:52 PM
Robot, RC Pilot & Builder :-)
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Roanoke, VA, USA
Joined Jul 2006
4,181 Posts
Quote:
Originally Posted by hargard View Post
Hi
I have been making hobby RoV's for some time now and I am now on number 5.
...
Regards Antony(UK)
Hi Antony,

Wow! You have done awesome ROV work!

Please post pictures and video of your ROVs!

I would enjoy seeing your ROVs in action, and learning from your work.

Thanks!

Kevin
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Old Oct 30, 2010, 03:34 PM
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Joined Nov 2005
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What do you use your ROV's for, and did you buy your VideoRay new or used?
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Old Oct 31, 2010, 03:41 AM
NeverAgainVolunteerYourse lf
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Australia, QLD, Regents Park
Joined Mar 2007
3,725 Posts
There Is a circuit I drew that allows a standard 36 Mhz TX to talk to a RX through a Co-ax Umbilical, the beauty of it was you can TX the Video Signal up the same Co-ax. I never had the impetus to complete the project but I did test the circuit over 100 metres of RG -179 (I think, 3 mm diameter)
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Old Nov 01, 2010, 06:42 PM
R.O.V. Man
hargard's Avatar
Devon UK
Joined Jan 2006
351 Posts
Hi
I will upload a few pictures of the Mk2/Mk3 but I cannot find any at this time of the Mk1 and the Mk4 never had any pictures..
As you can see they used a small pony bottle connected to a divers demand valve. This system worked a treat and never had any leaks or failures.
The thrusters were driven by DC motors with a gear box that was located inside the body.
I used a flexible coupling to link to the propellers.
They also carried on board battery’s.

I did a lot of research on using brushless motors in the sea. It turns out that provided you wash them out after every dive there was not much that can go wrong with them.
I had to replace the bearings with homemade brass ones.
With over 60 hours logged in usage.
I only had one fail on me...This was sand getting into the windings and cutting a wire.. so I filled the gap around the stator with potting compound then turned the excess off.
The last picture is a brushless motor testing before installing onto the RoV. That is a fan from a ducted fan unit..Note I removed 3 of the blades to get the amps right.

I will look for some more pictures But I promise nothing
Please ask any questions as I had to start somewhere too.

Regards Antony(UK)
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Old Nov 01, 2010, 06:53 PM
R.O.V. Man
hargard's Avatar
Devon UK
Joined Jan 2006
351 Posts
Hi
Too answer a few other questions...
The reason I got into RoV's is.. I have a disabled child who will never be able to go underwater. And me being a Diver wanted to show him the undersea.

I use the VideoRay for schools and such like activities.

The VideoRay is a Explorer that was second hand...Almost new..they have a hour clock built in..No cheating here.

The Mk 5 is very similar to the VideoRay but a little bigger.
As yet I have not taken any pictures of it but I will this week.

Regards Antony(UK)
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Old Nov 01, 2010, 09:06 PM
Metallica
robe_uk's Avatar
Londonderry UK
Joined Nov 2004
417 Posts
Great stuff Antony
It was your work using brushless motors that encouraged me to go down this route I like the idea of brass bearings/bushens as now I've got my minilathe I should be able to knock up some, but i'll just run as is during development.

I think its great you have been able to give your child an insight to the underwater world we as divers experience, this was one of the aims for me to start building mine, also i love gadgets

Is the mk5 and videoray surfaced powered? Am currently considering onboard power, what type/size of batterys did you run on your earlier versions and what sort of dive time did you get?

Oh pictures, yes please, of both your mk5 and videoray.

Rob
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Old Nov 02, 2010, 02:48 AM
Registered User
UK, Plymouth, Plymouth
Joined Oct 2010
5 Posts
Hi Rob.
A fellow Diver
I won't upload the videoray photos as there are enough out there already.
I will take some photos today and post them tonight.
The Mk5 is powered by surface battery or by my generator(12 volt rail).

Regards Antony(UK)

My lads account

Sent from my IPad
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Old Nov 02, 2010, 06:17 PM
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Sacramento
Joined Mar 2007
946 Posts
For a very corrosion-proof bearing try the Boca Bearing Co. ceramic/stainless-steel hybrid bearing. I'm using these in my boats and can be water lubricated.
I do think that BL motors exposed to the water is a very bad design due to magnets being highly susceptible to corrosive environments.
Regards,
John
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Old Nov 02, 2010, 06:21 PM
Metallica
robe_uk's Avatar
Londonderry UK
Joined Nov 2004
417 Posts
Very interesting indeed

I love the focus control on the camera, do you find you need that?, the small camera i intend to use is fixed focus. Also I see you have your brushless motor in a housing rather that out open to water, was that just your natural development to just improving as you went along or was there a requirement to house the motor? How have you the shaft sealed?

Aww I know loads of questions

Rob
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Old Nov 02, 2010, 06:24 PM
Metallica
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Londonderry UK
Joined Nov 2004
417 Posts
Quote:
Originally Posted by jaguar75 View Post
For a very corrosion-proof bearing try the Boca Bearing Co. ceramic/stainless-steel hybrid bearing. I'm using these in my boats and can be water lubricated.
I do think that BL motors exposed to the water is a very bad design due to magnets being highly susceptible to corrosive environments.
Regards,
John
Thanks for the heads up on the bearings, I do agree about the magnets which is why i plan to use a plasticdip coating over them http://www.plastidip.co.uk/

Rob
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Old Nov 02, 2010, 09:40 PM
Robot, RC Pilot & Builder :-)
kevinhines's Avatar
Roanoke, VA, USA
Joined Jul 2006
4,181 Posts
Quote:
Originally Posted by hargard View Post
Hi
I will upload a few pictures of the Mk2/Mk3 but I cannot find any at this time of the Mk1 and the Mk4 never had any pictures..
...
I will look for some more pictures But I promise nothing
Please ask any questions as I had to start somewhere too.

Regards Antony(UK)
Hi Antony, Thanks for sharing all this great info and the pictures.

What are the clear cylinders made of? And where does one get such cylinders?

Thanks!
Kevin
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Old Nov 03, 2010, 05:49 AM
R.O.V. Man
hargard's Avatar
Devon UK
Joined Jan 2006
351 Posts
Hi Rob
The focus is standard on the explorer and YES it is an advantage as you can zoom out in normal use and zoom in to look at barnacles feeding. This is the purpose of my RoV's.
After using focus on a RoV I would always have one...
Is you were just looking around at ship wrecks etc then it is not much use.

Yes putting the brushless motors into housings is a better way of doing things.
You gotta remember that this RoV is based on the Videoray design with modifications. The seals are the new VideoRay types and just plug in.

John
Thats a good idea for the bearings..
As far as the magnets are concerned mine have shown no decrease in power or speed by having them espoused to sea water.
It was a test to see what happens to the motors..

Kevin.
The early RoV's used polycarbonate for construction.
Polycarbonate can be found on the web. But you will only be able to purchase it in 2 metre lengths.
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