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'[EE]: good vibrations'
2001\08\31@053903 by John Walshe

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Hi guys,
   I've a weird one here that I've been racking by brain with. I need to
generate a vibration that is detectable by a human as a small tickle -
equivalent to a spider/insect crawling on your foot. My problem is that I've
only got 3V to work with from a coin cell(or 2) i.e. zilch current!. Also it
will be driven by a PIC running from the same battery so low power
consumption is of utmost importance.

I've been playing with piezo elements - I'm waiting on some housed elements
to be delivered to see if the resonant soundbox helps.

The proposed application area would prohibit the use of a cellphone
vibrating battery so that is discounted.

I just thought I'd throw this one out for comments.

Best regards, John

***************************************************************
spam_OUTJohn.WalsheTakeThisOuTspaminpactmicro.com

INPACT MICROELECTRONICS (Irl) Ltd
21A Pouladuff Road,
Cork,
Ireland,

Tel: +353 21 4318296
Fax: +353 21 4318980

WWW.INPACTMICRO.COM
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2001\08\31@061656 by Arpit

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Why not try a pulser circuit which pulses say 1 second of current into
a self oscillating relay every 5 seconds?

Hi voltage? I have a very nice circuit useing the lm3909,(you can also
use transistors:) ) that produces about 100 volts at VERY low amps,
and does indeed fell like a tickle.

On Fri, 31 Aug 2001 10:34:37 +0100, you wrote:

{Quote hidden}

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2001\08\31@113346 by John Walshe

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>
>Why not try a pulser circuit which pulses say 1 second of current into
>a self oscillating relay every 5 seconds?
>
>Hi voltage? I have a very nice circuit useing the lm3909,(you can also
>use transistors:) ) that produces about 100 volts at VERY low amps,
>and does indeed fell like a tickle.
>
Both of these are good ideas. I had thought of the high voltage also but as
I would not have direct skin contact I figure it's a non runner. The relay
though has me thinking.

Thanks,
John

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2001\08\31@114010 by Spehro Pefhany

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At 10:34 AM 8/31/01 +0100, you wrote:
>Hi guys,
>    I've a weird one here that I've been racking by brain with. I need to
>generate a vibration that is detectable by a human as a small tickle -
>equivalent to a spider/insect crawling on your foot. My problem is that I've
>only got 3V to work with from a coin cell(or 2) i.e. zilch current!. Also it
>will be driven by a PIC running from the same battery so low power
>consumption is of utmost importance.

I fear that without direct skin contact your required power level may push
you up to the point where the micro-motors with eccentric weights are about
as good as anything.

Best regards,
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speffspamKILLspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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2001\08\31@114624 by Roman Black

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Spehro Pefhany wrote:

> >    I've a weird one here that I've been racking by brain with. I need to
> >generate a vibration that is detectable by a human as a small tickle -
> >equivalent to a spider/insect crawling on your foot. My problem is that I've
> >only got 3V to work with from a coin cell(or 2) i.e. zilch current!. Also it
> >will be driven by a PIC running from the same battery so low power
> >consumption is of utmost importance.
>
> I fear that without direct skin contact your required power level may push
> you up to the point where the micro-motors with eccentric weights are about
> as good as anything.


I agree completely, a tiny pager motor with
counterweight will be more energy efficient as
a rotary "vibrator" than any practical relay
design. Isn't that why the pager companies
use them??
-Roman

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2001\08\31@120050 by Dan Michaels

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John Walshe wrote:
>Hi guys,
>    I've a weird one here that I've been racking by brain with. I need to
>generate a vibration that is detectable by a human as a small tickle -
>equivalent to a spider/insect crawling on your foot. My problem is that I've
>only got 3V to work with from a coin cell(or 2) i.e. zilch current!. Also it
>will be driven by a PIC running from the same battery so low power
>consumption is of utmost importance.
>
>I've been playing with piezo elements - I'm waiting on some housed elements
>to be delivered to see if the resonant soundbox helps.
>
>The proposed application area would prohibit the use of a cellphone
>vibrating battery so that is discounted.
>


Hi John,

There are little vibrators available for pagers, but I don't know
the electrical details.

Re piezo elements, I should think that would work. If you
connect one to a PIC at 5v, and pulse it, the volume is
loud enuf to drive you out of the room. I use a 100-1000 ohm R
in series to limit volume. 3v might be ok for skin vibrations.

Also, be aware that these things will sing perfectly well at
frequencies down as low as 100-200 hz and up to 10 khz, despite
what the "resonant" frequencies are touted as. At the low-end,
you might get nice vibrations without too much volume.

hope this helps,
- dan michaels
http://www.oricomtech.com
==========================

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2001\08\31@120432 by cision Electronic Solutions

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My pager vibrator would certainly be a very large spider.  Can you excite a
tuning fork?  Weren't there some watch mechanisms running on tuning forks?
Maybe my imagination ...

{Original Message removed}

2001\08\31@150913 by Bob Ammerman

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A really tiny solenoid wound on a coil form, with a pin as a freely movable
core to do the tickling?

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: "Ed Browne, Precision Electronic Solutions" <.....Ed_B_PESKILLspamspam.....SWBELL.NET>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Friday, August 31, 2001 12:00 PM
Subject: Re: [EE]: good vibrations


> My pager vibrator would certainly be a very large spider.  Can you excite
a
> tuning fork?  Weren't there some watch mechanisms running on tuning forks?
> Maybe my imagination ...
>
> {Original Message removed}

2001\08\31@151955 by Spehro Pefhany

picon face
At 03:04 PM 8/31/01 -0400, you wrote:
>A really tiny solenoid wound on a coil form, with a pin as a freely movable
>core to do the tickling?

Sharpen it and add ink reservoirs for CNC tattoos?

Best regards,
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speffspamspam_OUTinterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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2001\08\31@153047 by Chris Carr

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Ed Browne wrote


> My pager vibrator would certainly be a very large spider.  Can you excite
a
> tuning fork?  Weren't there some watch mechanisms running on tuning forks?
> Maybe my imagination ...
>
Bulova Accutron

http://www.elektron.demon.co.uk/accutron.html

gives some info or put Bulova Accutron into Google and it throws up plenty
of links

Regards

Chris Carr

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2001\08\31@171805 by Terry

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At 03:18 PM 8/31/01 -0400, you wrote:

>At 03:04 PM 8/31/01 -0400, you wrote:

>>A really tiny solenoid wound on a coil form, with a pin as a freely movable

>>core to do the tickling?

>

>Sharpen it and add ink reservoirs for CNC tattoos?


Put it over the "got to pee NOW" accupoint...


Cheers

Terry



Design Consultant

T3DESIGN

Innovative Product Development

<italic>Thinking out of the box.</italic>

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'[EE]: good vibrations'
2001\09\01@135832 by Peter L. Peres
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Tiny motor with excentric blunt axle or prod generating excentric circular
excitation with about 0.5 to 2 mm amplitude. If the motor has a long
enough axle just bend it carefully with pliers (so as not to damage the
front bearing - take an idle current reading before and after to make
sure) and make a rounded blob of epoxy on the end. This pressed lightly on
the skin through a teflon or vinyl membrane should feel right.

Peter

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2001\09\03@044940 by Alan B. Pearce

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>>Sharpen it and add ink reservoirs for CNC tattoos?

>Put it over the "got to pee NOW" accupoint...

I think you could sell this to every parent who takes kids on long car
journeys. Dad sees rest area coming up and pushes button - all kids want to
"stop now dad, I need the rest room"......

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2001\09\03@124041 by John Walshe

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Hi Guys,
   Thanks for all the answers - some had us in knots with laughter (where
exactly is that aforementioned accupoint ;-)). I have not been lucky in
tracking down the mobile phone vibrator/micromotors apart from adverts from
cellphone resellers. Does anyone have a link to the mfg of such devices?

Thanks again,
John

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2001\09\03@134755 by John Ferrell

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How about distributors?
Jameco
All Electronics (DCM-154, $2.00 ea., 62ma @ 1.5volts.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



{Original Message removed}

2001\09\04@054505 by John Walshe

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Thanks John, That sent me on the right track, I had been searching with
micro motors, mini motors, vibration etc but not the "vibrating motor"
combination!
Thanks again everyone

{Original Message removed}

2001\09\04@141308 by Peter L. Peres

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imho try http://www.asiansources.com

There are at least 1 dozen manufacturers. For small qty. try to partner
with another small qty. requirer. I think that you can special order the
weight replaced with a small plastic piece with a protruding rounded pin
or knurl with enough qty.

Are you making an anti-snore device ? ;-)

Peter

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2001\09\04@233225 by Gennette, Bruce

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A while back there was a model train parts retailer who offered lots of
different motors to sell to modelers.  At least once she had the vibrating
motors for sale.

At least worth a look if you fail to find the real source.

Bye.

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