From: Christian, Tom <Tom.Christian@RedPrairie.com> - 2003-04-29 17:56:07
Perhaps gravity is helping your contacts close earlier (with less magnetic
force) that if mounted right-side up on the ground. I do think that your
idea of mounting it at the top is interesting. Although mine has been
operating without a problem for about 5 years, it does have some corrosion
on it that probably wouldn't have happened if it were not on the ground
getting water/snow on it sometimes.
[mailto:misterhouse-users-admin@...]On Behalf Of Chris
Sent: Saturday, April 26, 2003 10:46 PM
Subject: Re: [misterhouse-users] request for info on
monitoring/controlling garage doors
> Any mh'ers out there using switch sensors to monitor garage doors
> and/or a
> relay board to open/close them? Any code examples you would like to
> Advice? Horror stories?
There were lots of replies to this thread, but I didn't see any that
offered any horror stories... I might be able to come close.
I don't open/close the doors (yet), b/c i wanted to make sure the
monitoring was solid. (It's not). My doors are monitored with the
sensors at http://www.smarthome.com/7455.html
The install docs for those sensors seem to imply that they s/b mounted
with the armored cable/sensor component on the floor, and the magnet/L
bracket on the door. That seemed stupid to me (still does), so i
mounted the sensor on the wall above the door, and the magnet is
attached to the door near the top. (The only difference that I am aware
of b/t my install and the suggested install is that i have the sensor
rotated 90 degrees). Anyway, when the door is closing, my multimeter
shows that the sensor picks up the magnet from a couple inches away, and
holds it closed as the magnet moves closer. When the door is completely
closed, the magnet is less than 1/4 inch from the sensor in the closed
position. Most of the time, everything is fine, and works as expected.
Here's the rub: don't know what the trigger is, but occasionally, the
system goes nuts, and starts reporting (false) open/closes at a rate
that varies from once every 10 minutes to around 4 times per minute.
I've only noticed this when the door is physically closed and the magnet
s/b pulling the sensor toward it. The sensors are hooked up to my caddx
nx8e alarm panel, but I don't think that's the source of the
disturbance. Right now i kind of think it's the sensors (but don't have
anything solid to base the hunch on)...
Technology can really suck when it doesn't work right...
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