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'[EE] Normally closed reed switch'
2012\02\22@153743 by Charles Craft

picon face
www.ebay.com/itm/5-SMD-NC-Security-Window-Magnetic-Contact-Reed-Switches-free-shipping-/160744436147

I'm looking for an inexpensive (preferably magnetic) switch to turn on a cabinet light when the door is opened.
Initially the LED lamp will be battery powered so need a basic mechanical switch that doesn't draw
power when the door is closed.

The security switch on eBay looks like what I want but is there a better way to do it?
I've looked at mechanical (plunger or micro-switch) and they are all more expensive.

thanks
chuckc

2012\02\22@154613 by Nily

flavicon
face
may a mercury switch will work, as soon as it tilts it turns on the load.

Rodolfo

-----Mensaje original-----
De: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu]En nombre de
Charles Craft
Enviado el: Wednesday, February 22, 2012 12:38 PM
Para: PIClist
Asunto: [EE] Normally closed reed switch


www.ebay.com/itm/5-SMD-NC-Security-Window-Magnetic-Contact-Reed-Switc
hes-free-shipping-/160744436147

I'm looking for an inexpensive (preferably magnetic) switch to turn on a
cabinet light when the door is opened.
Initially the LED lamp will be battery powered so need a basic mechanical
switch that doesn't draw
power when the door is closed.

The security switch on eBay looks like what I want but is there a better way
to do it?
I've looked at mechanical (plunger or micro-switch) and they are all more
expensive.

thanks
chuckc

2012\02\22@162328 by Denny Esterline

picon face
On Wed, Feb 22, 2012 at 1:37 PM, Charles Craft <chuckseaspamKILLspammindspring.com>wrote:

>
> http://www.ebay.com/itm/5-SMD-NC-Security-Window-Magnetic-Contact-Reed-Switches-free-shipping-/160744436147
>
> I'm looking for an inexpensive (preferably magnetic) switch to turn on a
> cabinet light when the door is opened.
> Initially the LED lamp will be battery powered so need a basic mechanical
> switch that doesn't draw
> power when the door is closed.
>
> The security switch on eBay looks like what I want but is there a better
> way to do it?
> I've looked at mechanical (plunger or micro-switch) and they are all more
> expensive.
>
> thanks
> chuckc
>
>
Normally closed reed switches are readily available and (subject to
shipping cost...) considerably cheaper than what you linked.
A brief search on Digikey shows
59140-040-ND<search.digikey.com/us/en/products/59140-040/59140-040-ND/412710>
about
4,000 in stock, less than $5 each in singles. Mounts similar to the one you
linked, other mounting options were available as well.

-Denn

2012\02\22@165121 by Charles Craft

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-----Original Message-----
{Quote hidden}

Thanks! At least I'm on the right track.
The eBay listing was for a five pack so about $2.16 each delivered.
I could drive to Thief River Falls in a couple hours but hard for them to beat Hong Kong on price.

thanks
chuckc


>

2012\02\22@171705 by YES NOPE9

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face
Use a normally open reed switch.... when the door opens the magnet moves into contact with the reed switch.   When the door closes, the magnet is moved away.
gus

2012\02\22@172420 by IVP

face picon face
A CMOS gate IC will draw neglible power so you could use a
NO reed or tilt switc

2012\02\22@172644 by Nily

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face
Charles

this eBay item will
work:www.ebay.com/itm/10pcs-Mercury-Tilt-Switch-0-3A-20V-101-/2507773
30926?pt=LH_DefaultDomain_0&hash=item3a637e64ee#ht_1242wt_754

Cheers

Rodolfo



-----Mensaje original-----
De: @spam@piclist-bouncesKILLspamspammit.edu [KILLspampiclist-bouncesKILLspamspammit.edu]En nombre de
Charles Craft
Enviado el: Wednesday, February 22, 2012 12:38 PM
Para: PIClist
Asunto: [EE] Normally closed reed switch


www.ebay.com/itm/5-SMD-NC-Security-Window-Magnetic-Contact-Reed-Switc
hes-free-shipping-/160744436147

I'm looking for an inexpensive (preferably magnetic) switch to turn on a
cabinet light when the door is opened.
Initially the LED lamp will be battery powered so need a basic mechanical
switch that doesn't draw
power when the door is closed.

The security switch on eBay looks like what I want but is there a better way
to do it?
I've looked at mechanical (plunger or micro-switch) and they are all more
expensive.

thanks
chuckc

2012\02\22@225341 by David VanHorn

picon face
With a second magnet, you can invert the reed switch from NC to NO or
vice versa.
They sell this as a "balanced field" switch for more $

Watch your current on these, the contacts won't stand much current, or
inductive loads well

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