On Wed, Sep 13, 2000 at 10:49:18AM +0100, gl wrote: > So basically I'm looking for an ultra-compact and light rotation sensor component to act as a resistor. Of course accuracy is largely irrelevant, but as I'm planning to mount the sensor and a watch style battery at the bottom center of the disc to minimize the effect on the aerodynamics, small weight and size are paramount. Remote-controlled helicopters use tiny gyroscopes to maintain flight stability, check www.towerhobbies.com for prices...the smaller piezoelectric ones are pretty expensive. Don't know how you'd rig it to change resistance with higher rates of spin. > Is there such a thing? Or can anyone think of a way to hack something to get the same effect? For example, how do the lit up yo-yo's work (they do exactly what I'm after come to think of it)? The yo-yos have little weighted bits of metal in them that, when the yo-yo spin, are pulled towards the outside of the yo-yo by centrifugal force and contact a little metal post, completing the circuit and powering the lights. They don't have anything in them for coupling spin rate with light brightness, AFAIK. -- Nick Kartsioukas | KF6UZB| NK2694 -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" to
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