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Re: Garage door automation - position detection
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Stronger magnets? You can get neodymium mags on eBay for a couple of pound,
or source them from an old hard disk. Very strong - don't get a finger
between two - it hurts!
Alternatively, photo-interrupters (similar to your break beam)?
R.
--
Rob Iles
Harmony Automation (www.domialifestyle.com)
myBBS (www.mybbs.co.uk)
On 1 Feb 2014 14:03, "Simon McCaughey" <simonmcc@xxxxxxx>
wrote:
>
>
> I have automatic garage roller doors installed which operate from a
remote
> control. Recently I have been working on a project to use a Raspberry
Pi to
> remote control them. So I have some relay outputs, and that all works
fine.
>
> I also decided to install a beam detector, so that if the door is
closing
> and the beam is broken that the door will reverse.
>
> To detect if the door is open or closed I planned to use magnetic reed
> switches - one at the top and one at the bottom, nice and simple way
to
> know where the door is (I don't care where it is at if it is somewhere
in
> the middle
>
> The problem: I have tried and tried, but I can't come up with a
position
> for the switches that works, its really tricky, far worse than I
thought it
> would be, it is hard to get them in a position where they are
triggered by
> the magnets.
>
> Any other suggestions for door position sensing? I thought of
> microswitches with a actuator arm, but again I'm not sure where they
could
> be positioned.
>
> Regards
>
> Simon
> ---
>
>
>
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<p dir="ltr">Stronger magnets? You can get neodymium mags
on eBay for a couple of pound, or source them from an old hard disk. Very
strong - don't get a finger between two - it hurts! </p>
<p dir="ltr">Alternatively, photo-interrupters (similar to
your break beam)? </p>
<p dir="ltr">R. </p>
<p dir="ltr">--<br>
Rob Iles<br>
Harmony Automation (<a href="http://www.domialifestyle.com";>www.domialifestyle.com</a>)
<br>
myBBS (<a href="http://www.mybbs.co.uk";>www.mybbs.co.uk</a>)
</p>
<div class="gmail_quote">On 1 Feb 2014 14:03,
"Simon McCaughey" <<a href="mailto:simonmcc@xxxxxxx";>simonmcc@xxxxxxx</a>>
wrote:<br type="attribution"><blockquote
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<u></u>
<div style>
<span> </span>
<div>
<div>
<div>
<p><div dir="ltr">I have automatic garage roller
doors installed which operate from a remote control. Recently I have been
working on a project to use a Raspberry Pi to remote control them. So I
have some relay outputs, and that all works fine. <div>
<br></div><div>I also decided to install a beam detector,
so that if the door is closing and the beam is broken that the door will
reverse. </div><div><br></div><div>To
detect if the door is open or closed I planned to use magnetic reed
switches - one at the top and one at the bottom, nice and simple way to
know where the door is (I don't care where it is at if it is
somewhere in the middle</div>
<div><br></div><div>The problem: I have tried and
tried, but I can't come up with a position for the switches that
works, its really tricky, far worse than I thought it would be, it is hard
to get them in a position where they are triggered by the
magnets.</div>
<div><br></div><div>Any other suggestions for door
position sensing? I thought of microswitches with a actuator arm, but again
I'm not sure where they could be
positioned.<br><div><br
clear="all"><div><div dir="ltr">
Regards<br>
<br>Simon<div>---</div><div><br></div></div></div>
</div></div></div>
</p>
</div>
<div style="color:#fff;min-height:0"></div>
</div>
</blockquote></div>
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