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'[EE]: Tilt switch replacement'
2001\06\27@185452 by Peter Grey

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I am using a mercury tip over switch which activates at 20 degrees. It is
Normally closed. I wish to replace this with something a little smaller and
certainly cheaper. The price here in Australia is about $9.00 in 100
quantities. The switch is about 15 mm diameter and

Has anyone any suggestions.

TIA



Peter

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2001\06\27@200116 by Antonio L Benci

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How about a bimetallic temp switch. Farnell or RS stock such devices ???

Peter Grey wrote:
{Quote hidden}

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2001\06\27@211352 by Spehro Pefhany

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At 10:00 AM 6/28/01 +1000, you wrote:
>How about a bimetallic temp switch. Farnell or RS stock such devices ???

Hmmmm I think he means *angular* degrees.

Automobile trunk (boot?) lights are moving to environmentally safer switches
that use a rolling ball and contacts. No manufacturer's names handy, sorry.

If this requires UL/CSA (eg. for deactivation of heaters if they are tipped
over) there are probably another set of options.

Best regards,

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2001\06\27@214828 by Peter Grey

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At 09:15 PM 6/27/2001 -0400, you wrote:

Ah Ha, now I understand the reason for suggesting the temp switch! I am
using the tip over switch to monitor a portable application but will not
need UL approval. Sorry I cannot be a little more specific but there are
secrecy provisions in place.

Thanks,

Peter
{Quote hidden}

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2001\06\27@215905 by Gennette, Bruce
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Could you use a normal micro switch and a pendulum (weighted bar).
2 at 90° or 180° in a clever design should cover most situations.
Or 3 at 120° spacing if your item could fall in any direction.

I have also seen these as normally open switches using a short piece of
copper pipe (a ring really) as one contact and a ball bearing hanging on a
wire as the second contact.  Length and stiffness of the wire sets the
sensitivity.

Bye.

{Original Message removed}

2001\06\27@220745 by Lee Jones

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Another inexpensive tilt switch is the kind used in
pinball games.  Upper support is an L-like bracket.
Loop end of a threaded rod hangs from the L bracket.
A couple inches lower is a metal circular hole.  One
wire is connected to the L bracket and the other wire
to the circular hole.

A conical weight on the threaded rod clears the hole
when normally upright.  When bumped, pushed, or tipped,
the weight touched the circular edge and closes the
circuit.  You adjust sensitivity of the device by the
position of the weight on the threaded rod.

                                               Lee Jones

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2001\06\27@223450 by Barry Gershenfeld

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Note that you can activate this without ever tilting
the machine.  This is why you have to think about
whether your switch would be affected by linear
acceleration.

I have seen these "caged ball" tilt switches in a surplus
store.  Very simple, and quite small.  About the size of a
mini-DIN jack.   Sounds a lot like the one described
previously for car trunks.

Barry

PS- Secret application?  Cow tipping sensor? (Plus GPS
anti-wander device)


At 07:09 PM 6/27/01 -0700, you wrote:
{Quote hidden}

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2001\06\27@225947 by Peter Grey

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At 11:57 AM 6/28/2001 +1000, you wrote:
I am looking for something that is smaller than the mercury switch being
used. This is 15 mm diameter and 10 mm long, not counting the terminal. I
would like something about 10 mm diameter and can live with the 10 mm in
length. It needs to be in a small box

Thanks,

Peter
{Quote hidden}

>{Original Message removed}

2001\06\27@233402 by Mark Newland

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1) Take apart a clothes iron and see what they use in there.

2) I have heard that one could maybe use an accelerometer for this type of
function also? Probally more money but alot smaller.

Peter Grey wrote:

> At 11:57 AM 6/28/2001 +1000, you wrote:
> I am looking for something that is smaller than the mercury switch being
> used. This is 15 mm diameter and 10 mm long, not counting the terminal. I
> would like something about 10 mm diameter and can live with the 10 mm in
> length. It needs to be in a small box

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2001\06\27@233619 by Tony Nixon

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Mark Newland wrote:
>
> 1) Take apart a clothes iron and see what they use in there.
>
> 2) I have heard that one could maybe use an accelerometer for this type of
> function also? Probally more money but alot smaller.


Don't small electric bar heaters also have a tilt switch fitted?

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2001\06\28@004936 by rottosen

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"Gennette, Bruce" wrote:
>
> Could you use a normal micro switch and a pendulum (weighted bar).
> 2 at 90° or 180° in a clever design should cover most situations.
> Or 3 at 120° spacing if your item could fall in any direction.
>
> I have also seen these as normally open switches using a short piece of
> copper pipe (a ring really) as one contact and a ball bearing hanging on a
> wire as the second contact.  Length and stiffness of the wire sets the
> sensitivity.
>
> Bye.


If you are going to roll your own then how about a reed switch and a
magnet? Dangle a bar magnet over the reed switch or slide a ring magnet along
the reed switch maybe? Low current only, of course.


-- Rich



> {Original Message removed}

2001\06\28@013903 by Peter Grey

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At 08:33 PM 6/27/2001 -0700, you wrote:
An accelerometer is something I was considering but am not sure what is
involved with this. Is there a cheap model that may be used?

Thanks,

Peter
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2001\06\28@021745 by Anand Dhuru

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One way to make a smaller mercury switch: grind off the top of a small neon
bulb (the knid with leads, not threads); put in a glob of mercury and
re-seal it using a flame (heat the open end, and close it using a plier
while its red-hot).

Of course, one can use the same technique with miniature filament bulbs as
well; just make sure you open up the filament before re-sealing.

Regards,

Anand

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2001\06\28@022218 by Anand Dhuru

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Another way to make an accelorometer is to use a pot, with a lever attached
perpendicular to the shaft; put a weight at the end of the lever, and the
rate of changes in the resistance would be proportional to the acceleration
the unit experiences

Regards,

Anand

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2001\06\28@044117 by Bala Chandar

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Hi Anand,

Very good idea to make a tilt switch!

I suppose you can buy a cheap clinical thermometer for the mercury you
need.

I don't know how easy it is to heat the small glass tube till it becomes
red
hot and close the hole with pliers. Instead, can't we use an epoxy
adhesive
like Araldite which is not affected my most chemicals including perhaps
mercury?


Regards,
Bala


> {Original Message removed}

2001\06\28@060830 by Roman Black

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Peter Grey wrote:
>
> At 11:57 AM 6/28/2001 +1000, you wrote:
> I am looking for something that is smaller than the mercury switch being
> used. This is 15 mm diameter and 10 mm long, not counting the terminal. I
> would like something about 10 mm diameter and can live with the 10 mm in
> length. It needs to be in a small box


Hi Peter, Jaycar (http://www.jaycarelectronics.com)
SM-1035
125v 3A ac
18mm x 5.5mm diameter, glass mercury switch,
$2.15 (inc gst) in 25 quantity.

They will negotiate for larger quntities, like
a hundred.
-Roman

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2001\06\28@072012 by Olin Lathrop

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> Ah Ha, now I understand the reason for suggesting the temp switch! I am
> using the tip over switch to monitor a portable application but will not
> need UL approval. Sorry I cannot be a little more specific but there are
> secrecy provisions in place.

I know this is a long shot, but would a cheap accellerometer work in this
application?  We are using some in a project now, and they can be cheaper
than mechanical switches.  Of course they need to be on to work.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olinspamspam_OUTembedinc.com, http://www.embedinc.com

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2001\06\28@093042 by Mark Newland

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I had already suggested this to him also but I didn't know any part numbers to
cheaper models.  I do know about the ADXL line by Analog Devices but I think
they are about $20 each.  Whats the part number for the cheap stuff please.

Olin Lathrop wrote:

{Quote hidden}

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2001\06\28@150611 by Peter L. Peres

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There is a capsulated ball switch that may work for you. It is made by TDK
I think. About 13mm long and 6mm dia. I do not know where you could obtain
these, I got mine from a rep here some time ago. They were $1 or $2.

Peter

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2001\06\28@215059 by Olin Lathrop

face picon face
> I had already suggested this to him also but I didn't know any part
numbers to
> cheaper models.  I do know about the ADXL line by Analog Devices but I
think
> they are about $20 each.  Whats the part number for the cheap stuff
please.

I'm not the guy buying these parts, but the schematic I'm looking at says
ADXL202JE.  I've been told these are low end accellerometers that are about
something like $2 to $5 in quantity.  I don't know the detail, but I'm quite
sure we are paying a lot less than $20.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, KILLspamolinKILLspamspamembedinc.com, http://www.embedinc.com

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2001\06\29@010427 by Mark Newland

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Your purchasing guy must be good, REALLY GOOD!!!  Just did a web search for a
ADXL202JE and found the following prices at the following distributors:

Seqyung:
    $Call

Avnet Marshall:
    01 - 24: $20.625
    25 - 99: $19.250

Future:
    01 - 09: $44.660
    10 - 19: $39.078
    20 - 49: $33.495
    50 - 99: $30.146
    100+   : $25.680

Analog Devices:
    100-499: $15.630

This is also the cheapest of the ADXL line that I could find.  Other versions
were even more money.  You think we could use your purchasing agent at times?
Charge us a 100% markup and we would still save money.

Olin Lathrop wrote:

{Quote hidden}

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2001\06\29@012636 by Jinx

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> Now, many here have suggested a homemade ball switch
> consisting of a metal ball in a cage

I've only ever needed tilt switches a couple of times and made
my own. A friend of a friend is a jeweller and he kindly threw
the copper contacts and ball bearings into a plating bath and
gold flashed them. It cost so little he didn't even even consider
charging me. As long as the final assembly stays sealed I
expect them to work for a long time to come

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2001\06\29@015310 by Alan Shinn

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Olin,
Tell us more please about these "cheaper than mechanical" accelleromers.
Like where from and how much and what they do etc.
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"Subject: Re: [EE]: Tilt switch replacement
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

"> Ah Ha, now I understand the reason for suggesting the temp switch! I am
> using the tip over switch to monitor a portable application but will not
> need UL approval. Sorry I cannot be a little more specific but there are
> secrecy provisions in place.

I know this is a long shot, but would a cheap accellerometer work in this
application?  We are using some in a project now, and they can be cheaper
than mechanical switches.  Of course they need to be on to work."

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'[EE]: Tilt switch replacement'
2001\07\02@120959 by Olin Lathrop
face picon face
> Your purchasing guy must be good, REALLY GOOD!!!  Just did a web search
for a
> ADXL202JE and found the following prices at the following distributors:
>
> Seqyung:
>      $Call
>
> Avnet Marshall:
>      01 - 24: $20.625
>      25 - 99: $19.250
>
> Future:
>      01 - 09: $44.660
>      10 - 19: $39.078
>      20 - 49: $33.495
>      50 - 99: $30.146
>      100+   : $25.680
>
> Analog Devices:
>      100-499: $15.630

I asked the guy who is more familiar with buying these things.  What you
show are the low volume prices.  I've been told our price is around $4 since
we will be buying at 50K quantities.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olinEraseMEspam.....embedinc.com, http://www.embedinc.com

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