[simpits-tech] Switchs, Rotary and pot
Frank Riedel
simpits-tech@simpits.org
Fri, 16 Aug 2002 08:42:31 +0200
YEEESSSSS !
Back online...... :o)
Frank
----- Original Message -----
From: "Frank Riedel" <frank@rezultat.dk>
To: <simpits-tech@simpits.org>
Sent: Friday, August 16, 2002 8:31 AM
Subject: Re: [simpits-tech] Switchs, Rotary and pot
> tester !
> Frank
>
> ----- Original Message -----
> From: "Marv De Beque" <mdebeque@woh.rr.com>
> To: <simpits-tech@simpits.org>
> Sent: Tuesday, August 06, 2002 12:31 AM
> Subject: Re: [simpits-tech] Switchs, Rotary and pot
>
>
> > That is an open question.
> >
> > The answer is, it depends.
> >
> > However, you have not qualified the exact application, so it is hard to
> give
> > you a good answer.
> >
> > However, since I am constructing a F-16 cockpit, I can tell you what I
> plan
> > to use. I will use a potentiometer for almost all of my applications
> where
> > there is a knob. Except....
> >
> > ... the caveat is there are many knobs that use a rotary switch and I
will
> > use a rotary switch where it is required. I think you know what a
rotary
> > switch is, but if not, it is a mechanical switch that rotates to preset
> > positions.
> >
> > There are not too many places where an encoder will be applicable in my
> sim.
> > I may possibly use them for the ICP panel that sticks in the pilots
face.
> > There are 4 thumb wheels that control contrast, brightness, and other
> > functions on the HUD. An encoder may be physically easier to mount than
a
> > pot in those instances.
> >
> > Encoders require more expensive circuitry to operate than a pot.
General
> > rule of thumb is that there should be a good reason for using an encoder
> > where normally a pot will not do.
> >
> > I would recommend a pot.
> >
> > That being said, from the scope of the questions you are asking, I
wonder
> > where you are at in your project and what your project goals are? I ask
> > because I get a sense that you might be putting the cart before the
horse.
> >
> > What is your goal and what is your plan to get there?
> >
> > I am sure that you can get all the help you need right here, but it is
> good
> > to get the basics first, outline your goals, and then we can help you
> > execute your plan (or at least help you get a plan together).
> >
> > Marv
> > --
> >
> >
> > > From: "Frank Riedel" <frank@rezultat.dk>
> > > Reply-To: simpits-tech@simpits.org
> > > Date: Tue, 6 Aug 2002 00:09:33 +0200
> > > To: <simpits-tech@simpits.org>
> > > Subject: Re: [simpits-tech] Switchs, Rotary and pot
> > >
> > > Great exampels ;o)
> > > GOT IT ;o)
> > > BUT - can i use POT instead of ENCODERS in my pit ???
> > >
> > > Frank
> > >
> > > ----- Original Message -----
> > > From: "Marv De Beque" <mdebeque@woh.rr.com>
> > > To: <simpits-tech@simpits.org>
> > > Sent: Monday, August 05, 2002 11:57 PM
> > > Subject: Re: [simpits-tech] Switchs, Rotary and pot
> > >
> > >
> > >> No.
> > >>
> > >> A pot (short for potentiometer) is a device that rotates over a given
> > >> portion of a circle. This is usually about 270 degrees, but there
are
> > >> multi-turn pots that rotate 5, 10, or 20 turns from lock to lock.
> > >>
> > >> A pot is nothing more than a resistor that can be changed from zero
> > >> (usually) to its maximum value. 100,000 Ohms is typical for
simulator
> > > use.
> > >>
> > >> A pot, theoretically, has an infinite adjustment between its two
> extreme
> > >> values (i.e., 0 to 100,000 Ohms). So, like a faucet (in good working
> > >> order), you can adjust the flow to any value in between.
> > >>
> > >> A rotary encoder is different. It is a device that rotates like a
pot,
> > > but
> > >> instead of acting like a variable resistor, it sends out a set of
> pulses
> > > as
> > >> the knob turns. It is sort of like putting playing cards on the
forks
> of
> > > a
> > >> bicycle and turning the wheel. As each spoke passes, an audible
click
> is
> > >> heard (a pulse). You can count the pulses and then determine how far
> the
> > >> wheel has rotated. You need two two playing cards slightly offset in
> an
> > >> angular fashion to tell which direction the wheel is rotating. By
> looking
> > >> at which card clicks first you can tell direction of spin.
> > >>
> > >> The thing about encoders is that they have a "granularity". Unlike a
> pot
> > >> which is infinite, there are finite steps to an encoder. There may
be
> any
> > >> number of steps you can get from a few to several hundred steps per
> > >> revolution. You can resolve the rotation only down to the step, but
> you
> > > can
> > >> not tell how much an encoder rotates between step steps (i.e., a half
> > > step).
> > >>
> > >> Most encoders do not remember their positions when power to the
system
> is
> > >> turned off. So, the system must somehow save the last known position
> if
> > > it
> > >> is to pick up where it left off at power down. A pot has the same
> > >> resistance whether the system has power or not.
> > >>
> > >> A pot almost always has a mechanical stop. Resistance can only go so
> far.
> > >> An encoder does not necessarily have a mechanical stop and can be
> rotated
> > >> continuously without stopping.
> > >>
> > >> An example of an encoder is a computer mouse (at least the old ones).
> > > Some
> > >> new car stereos have them too.
> > >>
> > >> Two different animals that can be used in similar ways and each has
its
> > >> advantages.
> > >>
> > >> Sorry for the long message, but I am short on time.
> > >>
> > >> Marv
> > >> --
> > >>
> > >>
> > >>> From: "Frank Riedel" <frank@rezultat.dk>
> > >>> Reply-To: simpits-tech@simpits.org
> > >>> Date: Mon, 5 Aug 2002 23:35:45 +0200
> > >>> To: <simpits-tech@simpits.org>
> > >>> Subject: Re: [simpits-tech] Switchs, Rotary and pot
> > >>>
> > >>> Thanks alot for the explanation ;o)
> > >>>
> > >>> I found the F16 panels at simpits.org...
> > >>>
> > >>> Did i get it right - rotary encoders = potentiometers ??
> > >>>
> > >>> Thanks
> > >>> Frank !
> > >>>
> > >>> ----- Original Message -----
> > >>> From: "Andreas Fransson" <andreas.fransson@post.utfors.se>
> > >>> To: <simpits-tech@simpits.org>
> > >>> Sent: Monday, August 05, 2002 9:09 PM
> > >>> Subject: Re: [simpits-tech] Switchs, Rotary and pot
> > >>>
> > >>>
> > >>>> Frank,
> > >>>>
> > >>>> 3-way switches are (usually) on-off-on. With or without automatic
> > > return
> > >>> to
> > >>>> center position (not sure what the english expression for this
would
> > > be).
> > >>>>
> > >>>> Rotaries, if you mean rotary switches and not rotary encoders, may
or
> > > may
> > >>>> not have limits. A couple I have here for example do not. They go
all
> > > the
> > >>>> way around. What they do is just rotate a common ground around a
> number
> > > of
> > >>>> connections. Like a "normal" switch but with many more positions.
> Mine
> > >>> have
> > >>>> 12 I think. You could say that they are "all-on" in the sense that
> one
> > >>> lead
> > >>>> is always active. Encoders are a different breed altogether. They
are
> > >>>> commonly used to sense motion (rotation) rather than indicate
switch
> > >>>> positions.
> > >>>>
> > >>>> "Pots", or potentiometers, are basically variable resistors. I you
> use
> > > one
> > >>>> with EPIC, or as a replacement for a joystick pot, it is 100 ohm
> linear
> > >>> pots
> > >>>> you want.
> > >>>>
> > >>>> If you use the EPIC, the kind of switches you use are almost
> > > unimportant.
> > >>>> EPL (the EPIC programming language) is very flexible. It's not at
all
> > > like
> > >>>> the standard joystick momentary on/off pushbuttons.
> > >>>>
> > >>>> What aircraft (or whatever) panels are you looking for?
> > >>>>
> > >>>> Andreas
> > >>>> http://valhallainc.d2g.com
> > >>>>
> > >>>>
> > >>>> From: "Frank Riedel" <frank@rezultat.dk>
> > >>>>> Hi All !
> > >>>>>
> > >>>>> 3 way switchs - is that off-on-off or ????
> > >>>>> Rotary - is that 360 dg. or ???
> > >>>>> 2 way switchs - is that on-on or ???
> > >>>>> Pot - is that a normal potmeter 100 ohm or ???
> > >>>>> Is EPIC control all those switchs nomatter if it is on-of or on-on
> ???
> > >>>>>
> > >>>>> Do anyone of you guys have a link to a page where i can read about
> it
> > >>> ???
> > >>>>>
> > >>>>> and do anyone have a set of drawings of panels without knobs on
????
> > >>>>>
> > >>>>> thanks for all your help... i'm on the road for my first real pit
> ;o)
> > >>>>>
> > >>>>> Frank
> > >>>>
> > >>>>
> > >>>>
> > >>>> _______________________________________________
> > >>>> Simpits-tech mailing list
> > >>>> Simpits-tech@simpits.org
> > >>>> http://www.simpits.org/mailman/listinfo/simpits-tech
> > >>>> To unsubscribe, please see the instructions at the bottom of the
> above
> > >>> page. Thanks!
> > >>>
> > >>>
> > >>> _______________________________________________
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> > >>> http://www.simpits.org/mailman/listinfo/simpits-tech
> > >>> To unsubscribe, please see the instructions at the bottom of the
above
> > > page.
> > >>> Thanks!
> > >>
> > >> _______________________________________________
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