[simpits-tech] rotary switches
Alan D. Mazurka
simpits-tech@simpits.org
Wed, 12 Mar 2003 10:37:31 -0500
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Hi, Doug.
we've (a friend of mine, and myself) have solved the problem you describe
- and hope to turn it into a product.
it's based on an 11-position mechanical switch which contains an internal
stop. you can adjust the stop to any number of positions - from 2 to 11. it
interfaces to a PIC which then outputs "left" and "right" TTL-level logic
pulses suitable for a hagstrom/epic/phidgets type devices. basically, the
PIC "knows" the switches' current position, and can determine if it's being
turned left or right.
i'm using 2 as a train throttle and dynamic brake. the firmware is very
mature, and they have worked rock-solid to date - so it's possible.
the "30 to 45 degree" situation cannot be supported, as this is an
11-position device, and therefore subtends a smaller arc per click.
- adm -
At 12:15 PM 3/11/03 -0500, you wrote:
>I have a problem with normal mechanical "clicking" rotary switches. Has
>anyone come up with a method how you can have this kind of a switch
>"work" in a clockwise and counterclockwise direction. I can get it to
>work in a clockwise direction but not the other way. I'm sure some of you
>have experienced this problem and I wonder how you solved it if you have.
>I'm not talking about rotary encoders unless they can be made to have
>distinct 30 or 45 degree "clicks". Any help or advice would be
>appreciated.
>Thanks, Doug
>
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----------
Alan D.
Mazurka
adm.design@verizon.net
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Hi, Doug.<br><br>
we've (a friend of mine, and myself) have solved the problem you describe
- and hope to turn it into a product.<br><br>
it's based on an 11-position mechanical switch which contains an internal
stop. you can adjust the stop to any number of positions - from 2 to 11.
it interfaces to a PIC which then outputs "left" and
"right" TTL-level logic pulses suitable for a
hagstrom/epic/phidgets type devices. basically, the PIC "knows"
the switches' current position, and can determine if it's being turned
left or right.<br><br>
i'm using 2 as a train throttle and dynamic brake. the firmware is very
mature, and they have worked rock-solid to date - so it's
possible.<br><br>
the "30 to 45 degree" situation cannot be supported, as this is
an 11-position device, and therefore subtends a smaller arc per
click.<br><br>
- adm - <br><br>
At 12:15 PM 3/11/03 -0500, you wrote:<br>
<blockquote type=cite class=cite cite>I have a problem with normal
mechanical "clicking" rotary switches. Has<br>
anyone come up with a method how you can have this kind of a switch<br>
"work" in a clockwise and counterclockwise direction. I can get
it to<br>
work in a clockwise direction but not the other way. I'm sure some of
you<br>
have experienced this problem and I wonder how you solved it if you
have.<br>
I'm not talking about rotary encoders unless they can be made to
have<br>
distinct 30 or 45 degree "clicks". Any help or advice would
be<br>
appreciated.<br>
Thanks, Doug <br><br>
________________________________________________________________<br>
Sign Up for Juno Platinum Internet Access Today<br>
Only $9.95 per month!<br>
Visit
<a href="http://www.juno.com/" eudora="autourl">www.juno.com</a><br>
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<hr>
<br>
Alan D.
Mazurka
adm.design@verizon.net <br>
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