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,
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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.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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