[Discussion] Need help with a project - LED PoV

[Neftaly Hernandez]

Isn't the only acceleration outward, though? It might be possible to work
out the velocity by measuring the change in X and Y velocities over a period
of time, but this needlessly waaay overcomplicates things. If you just
measure only the Z acceleration (or to simplify the visual picture, you
would basically be using a weight sensor to measure centrifugal force) you
will know the exact speed at the moment of measurement, without needing to
know the past states.

On Wed, Sep 14, 2011 at 3:54 PM, Tolley, Gary <Gary.Tolley at cubic.com> wrote:

> Jaco and I last night, figure the only approach would be a gyro or
> accelerometer, and the little bit of research this morning reduced this down
> to a minimum of a 2 axis accelerometer, where one axis supports the other by
> reducing error due to twisting of the whole assembly as it is being flung
> around.****
>
> ** **
>
> Gary****
>
> ** **
>
> *From:* discussion-bounces at tangleball.org.nz [mailto:
> discussion-bounces at tangleball.org.nz] *On Behalf Of *Jaco van der Merwe -
> Workshop Enterprises Ltd.
> *Sent:* Wednesday, 14 September 2011 2:45 p.m.
> *To:* discussion at tangleball.org.nz
> *Subject:* Re: [Discussion] Need help with a project - LED PoV****
>
> ** **
>
> Nope - the electronics act as the weight being swung around, so the
> construction would be fairly straight-forward.****
>
> Kind regards ****
> - Jaco****
>
> ** **
>
>
> On 11/9/14 14:41 , Robert Carter wrote: ****
>
> So you guys are thinking of having a kind of small axle on the handle with the electronics on that. You spin the poi and each rotation triggers the sensor to give RPM?****
>
> ** **
>
> On 14/09/2011, at 2:37 PM, Vik Olliver wrote:****
>
> ** **
>
> On 14/09/11 10:34, Tolley, Gary wrote:****
>
> Jaco wants to use it like a poi, meaning the point of rotation is near****
>
> the hand.****
>
> ** **
>
> Makes it quite unusual to try and figure out the RPM.****
>
> ** **
>
> Sounds a great candidate for a hall sensor then.****
>
> ** **
>
> http://www.zipfelmaus.com/blog/arduino-with-hall-sensor/****
>
> ** **
>
> Vik :v)****
>
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> rob at mintmedia.co.nz****
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> 021 421129****
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> http://createrevolutionaryart.net****
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> @vdu23****
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