Re: sensor choice for "gong detect"? & invisible light switches

[bdolph <bdolph@xxxxxxxxxxx>]

The old Window Bug sensor might work.  It is adjustable.  Check out below:

http://www.unitedsecurity.com/supervise.htm

A couple of  other thoughts.

Does the bell tip much to ring?  If so you could use a mercury motion
switch on the inside.

Also, if you could electrically insulate the clapper the you could set
up a circuit that would be completed when the clapper hit the inside of
the metal bell.

BobbyD

Tracker wrote:

>Hello, all.  Long time no read etc.
>
>Anybody ever *actually done* a sensor on a heavy bell?  (It's a
>large-size "Mission Bell" by Tom Torrens, if you care...  To be used as
>a doorbell, well, actually as a button replacement for a DSC door box.)
> Specifically triggered by the resonating from the gong itself, no
>stuff like mallet switchhooks or motion sensor on the swinging mount...
> I thought about an old-style glass break, but getting the frequency
>right would be a trick.
>
>Also does anybody know if commercially cheap density sensors can be
>used to determine if a finger is placed on the other side of sheetrock?
> I'm gonna go do some experiments, so don't shoot me for asking first.
>But if someone has *already* done it, please let me know.  Why did this
>come up?  Well, I was looking at a Leviton "Acenti" ad the other day,
>and thought, "Why on earth does anybody want a larger, more prominent
>light switch?!"  Remember the Pass&Seymour/Legrand ones?  Ugly. as.
>sin.  Anyway, shouting "lights" at some comput er is silly, and motion
>sensors don't have the positive control (or on-location dimming)
>needed.  Again, don't flame me about greasy spots on the wall, or
>repairability of buried switches -- just, *if* you've done it, pretty
>please tell me what you learned.
>
>Thanks in advance!
>
>
>