[simpits-tech] Switchs, Rotary and pot
Jean Yves Surfin'
simpits-tech@simpits.org
Fri, 16 Aug 2002 08:50:27 +0200
:-)
I'm from France
----- Original Message -----
From: "Frank Riedel" <frank@rezultat.dk>
To: <simpits-tech@simpits.org>
Sent: Friday, August 16, 2002 8:42 AM
Subject: Re: [simpits-tech] Switchs, Rotary and pot
> 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!
> > > >>>
> > > >>>
> > > >>> _______________________________________________
> > > >>> 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!
> > > >>
> > > >> _______________________________________________
> > > >> 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!
> > > >
> > > >
> > > > _______________________________________________
> > > > 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!
> > >
> > > _______________________________________________
> > > 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!
> >
> >
> > _______________________________________________
> > 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!
>
>
> _______________________________________________
> 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!