Tatrame
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Underwater ROV

Fri Oct 05, 2012 12:31 pm

So ive just begun a project in tangent with our schools Underwater Robotics Team. My goal is to use the Raspberry Pi in order to replace the current control system, which consists of Three Lego NXTs and 6 Bread boards. As it is this project has only just begun, and we have until about December to get the whole thing working. my main goals are basic motor control, and camera usage. I was thinking that we could two Pi's together (one on board, one above ground) but i'm not entirely familiar with this area. I will try to keep this updated with our progress, but in the mean time, any suggestions, or ideas. the biggest problem we've run into so far is waterproofing the Pi up to at least 100 feet and still keeping it accessible.

Ravenous
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Re: Underwater ROV

Fri Oct 05, 2012 1:48 pm

It sounds like you're starting with an earlier version that already exists, if so do you have any pics and idea of the size, and (ahem) budget?

100 feet depth sound pretty serious for what I would think of as a school project... though maybe possible if you have a capsule you can seal it into. There have been a few amateur AUV's that I've read about but they're university level projects using specialised thrusters for steering, etc. (Nessie at Heriot-Watt is a name I remember, some project reports are on the net somewhere.)

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morphy_richards
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Re: Underwater ROV

Fri Oct 05, 2012 2:04 pm

I was wondering how the current control system with the lego nxt bricks managed with the waterproofing issue?

Ravenous
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Re: Underwater ROV

Fri Oct 05, 2012 4:14 pm

Oh I forgot to say earlier - I found this a while back:

http://makeprojects.com/Project/Mini-R- ... sible/2546

Interesting thing is he is using cheap toy motors with no sealing at all - running them under water. Clean water in his bathtub of course, so I suppose there's nothing to clog up the brushes. I doubt motors will live for many sessions used like this, but it's a fun idea anyway.

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morphy_richards
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Re: Underwater ROV

Fri Oct 05, 2012 4:28 pm

I wonder how much of the stuff in modern motors with ceramic magnets etc. would actually corrode underwater.

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raspberrypiguy1
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Re: Underwater ROV

Fri Oct 05, 2012 6:58 pm

Please can you show us some pictures or even some schematics?

Thanks
The Raspberry Pi Guy ;)
Matt, The Raspberry Pi Guy YouTube channel, author of Learn Robotics with Raspberry Pi, available now: http://mybook.to/raspirobots, Computer Science & Electronics Undergraduate at The University of Edinburgh

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morphy_richards
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Re: Underwater ROV

Fri Oct 05, 2012 8:15 pm

You could... Completely seal up all the electronics including the raspberry pi and a power supply (i think nimh batteries don't tend to violently explode too much.) You could possibly seal it all up in something like silicon sealant but before you do seal it you could make an inductive charger... Something like the chargers you see on some electric toothbrushes where for wet room safety you have no direct electrical connection but use electromagnetic induction to charge the battery instead .

Potential problems could come from the battery overheating while charging or the electronics overheating if they are all coated in silicon...

Bear in mind I'm just rambling on now, vaguely intoxicated and trying to avoid watching strictly come dance with me.

Edit - obviously you can't seal up the motors.
Last edited by morphy_richards on Fri Oct 05, 2012 8:31 pm, edited 1 time in total.

thogue
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Re: Underwater ROV

Fri Oct 05, 2012 8:24 pm

Thought this link would be great info for this thread : http://openrov.com

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