[simpits-tech] Switchs, Rotary and pot

Tue, 6 Aug 2002 00:09:33 +0200

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
> >>
> >>
> >>
> >> _______________________________________________
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> >
> >
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