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RE: [PSUBS-MAILIST] RC controller, question to Michael Wright

To: <personal_submersibles@psubs.org>
Subject: RE: [PSUBS-MAILIST] RC controller, question to Michael Wright
From: "Emile" <emile@airesearch.nl>
Date: Mon, 20 Nov 2006 17:24:35 +0100
In-reply-to: <003001c70bfb$7e1fd260$9800000a@acer07c1b363d4>
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org
Thread-index: AccMJ4bo9oYH9gnCT9WfRZcevxbfPgAmAUsg
Thijs,

I am also curious to this question.
I am also not an electonic technichan but it's a "don?t"to connect the
antenna's,
It should be possible with the signal of the teatcher/pupil connector (found
on the more professional transmitters)

Emile

-----Oorspronkelijk bericht-----
Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens Thijs Struijs
Verzonden: zondag 19 november 2006 17:55
Aan: personal_submersibles@psubs.org
Onderwerp: [PSUBS-MAILIST] RC controller, question to Michael Wright

Michael,

An airplane RC controller might be handy for controlling a manipulater or 
pan and tilt mechanism. Simple of the shelf black box components. No need 
for any knowledge of electronics. I have thought about a transmitter antenna

on the inside of a viewport and a receiver antenna on the outside. As you 
probably understand i am more the mechanical type.
But how do you actualy make a coax conextion? I cannot imagine that 
phisicaly connecting to two antennas works. The transmitter gives a "high" 
energy signal and the receiver is a sensitive thing. Or am i wrong?


Thijs Struijs
The Netherlands



----- Original Message ----- 
From: "Michael Wright" <mwright@smallip.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, August 26, 2006 6:22 AM
Subject: Re: [PSUBS-MAILIST] membersearch--ROVs


> The Mini-Rover ROV (think Little Geek in the Abyss) designed by DSSI  and 
> built and sold by Benthos used a repackaged model airplane radio  control.
>
> I fly a mini-rover at work that uses a standard 72mhz airplane 
> transmitter and works fine on cables up to at least 900'.  I much  prefer 
> flying it to our other ROV (which has a fully "purpose  designed" control 
> system.  The mini-rover is just plain quicker to  respond, and that's what

> matters when you're flying in pipe with 12"  or less visibility.  Anyone 
> doing their own control system should  keep that in mind.
>
> We've also got a long tunnel system that uses the same approach to go 
> 3400' (different frequency and an RF amp).  I'm in the process of 
> replacing the control system with one that uses RS-485 on separate  pair 
> (the old system suffered from interference issues).
>
> I have to admit to being seriously biased in favor of the mini-rover  over

> any other ROV designs of it's time.  It was the most elegant  solution 
> then and since everything is smaller now it has gobs of  space inside for 
> me to add cool stuff to it.  It's precisely as large  as you can make an 
> ROV and still have 1 strong person launch and  recover it.
>
> A second advantage of the RC airplane controller is that you can put  the 
> video on the same coax (the mini-rover has splitter/combiner  boxes, but 
> I'm not sure they're necessary, heck, I'm not sure they're  not just a 
> shielded solder joint.  On the mini-rover they wrap the  standard receiver

> unit in aluminum tape (like you'd use on AC  ducts).  As far as I can tell

> the video from the camera goes straight  on the coax, along with the 
> control signals.
>
> So the next question is how you take the forward/reverse and right/ left 
> channels and mix them together to make the main thrusters do the  right 
> thing.  You have a few options for this, the first is to get an  RC 
> Airplane controller that does it.  The second is to buy a motor 
> controller that does it like the one from roboteq (http:// 
> www.roboteq.com) that does it.  The third option is to code up micro- 
> controller to do it.  I chose to order the motor controller that does  it,

> even though I have a micro-controller in the vehicle.
>
> If you find a way to power the vehicle inside the vehicle (like with 
> lithium polymer batteries) you can use off the shelf RG6 coax as the 
> umbilical.  The video and RF on coax is probably good for at least  1000 
> feet.
>
> So basically, you don't need to program to build a usable ROV.   Telemetry

> (depth, heading, battery state) would require programming,  but if you put

> the On Screen Display generator board in the vehicle  you can still use 
> the single coax.
>
> Maybe we should do an open source ROV.
>
> If anyone's in the SF Bay Area or Monterey we should get together and 
> talk shop sometime.
>
> mike
> Who has a camera and a control system, but needs thrusters and a few 
> other bits.
>
>
>
>
>
> On Mar 14, 2005, at 11:27 AM, steve wrote:
>
>> Hi Emile
>>
>> i am also (slowly) building an ROV and did for a while try  experimenting

>> with an R/C system for control.
>> i'm not sure if it does the control circuits any good but i found  that 
>> if i disconnect the antenna's i could quite easily connect the  tether 
>> cable directly to the antenna points and have control over  at least 30m 
>> / 100'.
>> like i said, its a bit 'heath robinson' and long term use in this  way 
>> may be an issue but i only tried it for an experiment so dont  really 
>> know.
>> personally i have opted for a microcontroller option like Julian,  albeit

>> mine is a £25 kit from Velleman that gives me 10 digital  outputs and 
>> sends the signal through a twisted pair to the receiver  in the sub. 
>> specified max distance of this kit is 50m / 150' which  is more than 
>> enough for my purposes
>>
>> hope that is of use to you
>>
>> steve
>> -----Original Message-----
>> From: owner-personal_submersibles@psubs.org [mailto:owner- 
>> personal_submersibles@psubs.org]On Behalf Of Julian Ford
>> Sent: 14 March 2005 15:35
>> To: personal_submersibles@psubs.org
>> Subject: Re: [PSUBS-MAILIST] membersearch--ROVs
>>
>> Hello, Emile.
>>
>> I built my own control box to control my ROV.  I use a  microcontroller 
>> inside to read
>> the joysticks and switches, and then send down a serial message to  the 
>> ROV.
>>
>> I also have written a software package that reads a Logitech  wireless 
>> gamepad, and sends the
>> appropriate signals to the ROV via an interface board I made  (basically 
>> converts the serial signal
>> from the laptop into RS-485 which can travel much further down a  cable).
>>
>> So the answer in my situation is that custom software and/or custom 
>> electronics is required.
>> I'm afraid that is not much help with respect to using an off-the- shelf 
>> RC controller...
>>
>> Let me know if I can be anymore help...
>>
>> Regards,
>> Julian Ford
>> ----- Original Message -----
>> From: Emile van Essen
>> To: personal_submersibles@psubs.org
>> Sent: Sunday, March 13, 2005 3:00 PM
>> Subject: Re: [PSUBS-MAILIST] membersearch--ROVs
>>
>> Julian,
>>
>> The person from Finland who was on the list steered the ROV with  the 
>> teatcher/pupil cable from a altered R/C transmitter. I was just  curious 
>> how he did that; a simple way to get the signals in a ROV.
>> I am not very good in electronics, jou do a good job in ROV  electronics 
>> as I see.
>> I am very interested in ROV's but have no clear question.
>>
>> Oops; I insulted somebody. It was not meant, I want to help newbe's  as 
>> some of the list helped me some years ago.
>> Well; if somebody is so easyly offended he is not suitable for the 
>> "silent service" thats clear.
>>
>> Regards, Emile
>> ----- Original Message -----
>> From: Julian Ford
>> To: personal_submersibles@psubs.org
>> Sent: Sunday, March 13, 2005 3:25 AM
>> Subject: Re: [PSUBS-MAILIST] membersearch--ROVs
>>
>> Hello, Emile.  May I ask what your interest in ROVs is?
>>
>> I am also an ROV builder.  I am currently negotiating the sale of
>> my electronics package to "real" ROV manufacturers...this includes
>> microcontrollers used to control camera pitch/yaw, and motors using  PWM.
>> It also has a several sensors, including digial compass, ROV pitch/ roll,

>> pressure,
>> temperature, etc.
>>
>> Anyway, if I can be of any help, please feel free to contact me.
>>
>> Regards,
>> Julian Ford
>
>
>
>
>
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