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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