Author Topic: VIBRATION SENSOR?  (Read 543 times)

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Offline strat321Topic starter

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VIBRATION SENSOR?
« on: May 20, 2013, 08:21:54 AM »
I am looking into using a vibration sensor a source of input, much like a vrbot.  Does such a device exist? Could it be used with the axon ii?
Thanks!

Offline Jon_Thompson

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Re: VIBRATION SENSOR?
« Reply #1 on: May 20, 2013, 09:41:10 AM »
Assemtech make some excellent non-directional vibration sensors in both nornally closed and normally open configurations. They're very small and quite cheap. Just hook them up and away you go. They'll take TTL levels.
You can still do a lot with a small brain.

Offline jwatte

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Re: VIBRATION SENSOR?
« Reply #2 on: May 20, 2013, 11:22:25 AM »
Another kind of sensor that works well for vibrations in the 10 Hz and below range is accelerometers, available as I2C chips in fairly affordable carriers.

Note that every smart phone for the last few years have been using these as input, so I'd say it's proven to work OK :-) The main thing to watch out for is telling "normal" vibrations of movement from the kinds of vibrations you want to detect.

Offline strat321Topic starter

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Re: VIBRATION SENSOR?
« Reply #3 on: May 21, 2013, 06:57:13 AM »
I appreciate these responses and will investigate. However with the I2C, I believe this would not work because i will use it to detect and analyze low level surface vibrations

Offline jwatte

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Re: VIBRATION SENSOR?
« Reply #4 on: May 21, 2013, 11:26:13 AM »
Before you say "it won't work," you need to specify the parameters you need.
What sensitivity (in gs) do you need? Is 1/100th of a g sufficient? 1/1000th of a g?
What frequency of vibrations do you need to detect? 1 Hz? 10 Hz? 10 kHz?
Once you know this, you can look at the data sheets for the various sensors and accelerometers available.

Offline olivthill

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Re: VIBRATION SENSOR?
« Reply #5 on: May 21, 2013, 04:27:12 PM »
Some accelerators have analog voltage outputs, instead of IC, such as this one http://www.pololu.com/catalog/product/1246
But there are a little more expensive than piezo devices such as this one http://www.robotshop.com/sfe-piezo-element-2.html or that one  https://www.sparkfun.com/products/9198

Offline strat321Topic starter

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Re: VIBRATION SENSOR?
« Reply #6 on: May 22, 2013, 03:52:42 AM »
What if I wanted to hook it up to a device such as an easy vr bot, in place of a microphone perhaps.  Would a piezo element sensor with analog stereo leads fit this bill?

 


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