Servo Mixer

Archiver

I'd like to use my BS2E as a multi channel servo mixer. Is the BS2E
fast enough? I'm thinking along the lines of a swiming pool
submarine, so the speed and accuracy needed for an airplane probably
wouldn't be necessary.

Has anyone done this before? How do you establish what order to check
the output of the receiver, and how do you ensure you don't miss too
many pulses?

Archiver

Paul wrote:
>I'm thinking along the lines of a swiming pool
> submarine,

Hi Paul, I'm not sure what a mixer is in this context, but I am wondering if
you were thinking about using R/C radio to control the underwater beast.

You may already know this but unfortunately R/C radio frequencies don't work
too well underwater. You could I suppose stick a lickle antenna up above
water - like a periscope.

There are other techniques for getting data to devices underwater, but they
are not ideal and pretty boring - if you need to know more just email me...

Regards,

Tony Wells

Archiver

Hello Paul,

Do you want to mix props and rudder, for example? Or do you have in mind a
submarine system that works like an
v-tail or x-tailed aircraft?

What is the dominant channel? Rudder?

I am struggling through an r/c mixing problem, for a racing sailboat, so perhaps
we have some similar problems.
Are you planning to mix at the xmtr, or at the receiver? Do you have a formula
for relating the two channels to
be mixed? Or do you plan to do it point by point?

The submarine R/C group is a very helpful bunch, incidentally. They have a very
active forum at:

http://www.subcommittee.com

Lastly, quite a few radios offer mixing as a built-in feature, and they are not
too expensive, to judge from the
offerings on ebay. Maybe the commercial mixers won't do exactly what you want,
which is a good reason to start
from scratch, but perhaps they would come pretty close.

best, Michael



md10bldr wrote:

> I'd like to use my BS2E as a multi channel servo mixer. Is the BS2E
> fast enough? I'm thinking along the lines of a swiming pool
> submarine, so the speed and accuracy needed for an airplane probably
> wouldn't be necessary.
>
> Has anyone done this before? How do you establish what order to check
> the output of the receiver, and how do you ensure you don't miss too
> many pulses?
>
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Archiver

So many good questions!
Let me start with the general concept. I'm thinking along the lines
of Jason - one of the mini sub/drones used when diving for the
titanic. There are motors on each side, which would allow you to spin
in place, or make slow tuns as you go forward. Similar to diffential
steering on a robot. There are also motors within the body pointed
straight up and down. I guess you could say that it moves a bit like
a helicopter.

So:
To equate this to a two stick transmitter, rudder side to side would
spin the motors in opposite directions, producing a spin in place.If
the elevator stick is pushed forward, both The two side motors would
drive, producing (hopefully) a stright line forward. The mixture
proportions are to be determined. The throttle stick would be used to
control vertical motion. Dominant channel? Hmmmm. Guess I would have
to finalize the configuration (dimensions, placement, etc.) to
determine that.

As I don't know too much about how the reciever decodes the signal, I
figured I would do the mixing between the reciever and servos.

Although I plan to start with some simple formulas for mixing, I
don't know that a linear response will do the job. Depending on the
complexity of the formula, and the Stamp speed, maybe a lookup table
would be faster.

And to the last question regarding the availablity of mixing radio
systems - I have a fair amout of radio control equipment laying
around from previous hobby endevours (including a dumas Huscon 36), a
new house with pool, and a shiny new Stamp. You get the picture. The
Stamp has so much potential, constrained only by my ignorance. It's
all about learning something new!

By the way, what are you considering for your sailboat? Sail control
based on wind speed/direction, or maybe "autopilot"??? could be even
more intresting than a submarine.

--- In basicstamps@y..., Michael Gianturco <michcg@m...> wrote:
> Hello Paul,
>
> Do you want to mix props and rudder, for example? Or do you have in
mind a submarine system that works like an
> v-tail or x-tailed aircraft?
>
> What is the dominant channel? Rudder?
>
> I am struggling through an r/c mixing problem, for a racing
sailboat, so perhaps we have some similar problems.
> Are you planning to mix at the xmtr, or at the receiver? Do you
have a formula for relating the two channels to
> be mixed? Or do you plan to do it point by point?
>
> The submarine R/C group is a very helpful bunch, incidentally. They
have a very active forum at:
>
> http://www.subcommittee.com
>
> Lastly, quite a few radios offer mixing as a built-in feature, and
they are not too expensive, to judge from the
> offerings on ebay. Maybe the commercial mixers won't do exactly
what you want, which is a good reason to start
> from scratch, but perhaps they would come pretty close.
>
> best, Michael
>
>
>
> md10bldr wrote:
>
> > I'd like to use my BS2E as a multi channel servo mixer. Is the
BS2E
> > fast enough? I'm thinking along the lines of a swiming pool
> > submarine, so the speed and accuracy needed for an airplane
probably
> > wouldn't be necessary.
> >
> > Has anyone done this before? How do you establish what order to
check
> > the output of the receiver, and how do you ensure you don't miss
too
> > many pulses?
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/