Vibration Monitoring
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Posts: 46,084
Actually, those look perfect. Checked Digikey and they have them for less
than $2 each! I ordered ten to allow for ham-fistedness. They look pretty
fragile.
I imagine they put out an AC signal? I can use an opamp to add an offset to
keep the voltage positive. Wondering how I'm going to actually catch the
peaks and valleys. I guess I could just spend a second continuously reading
the ADC then just keeping the highest and lowest readings obtained and
displaying those. Mr. Nyquist might turn a cold shoulder to me but...
Any thoughts?
>
Original Message
> From: Earl Bollinger [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8LWZxaMmVSZ0TSzESi8ueXQiDKmoREGtokD8x66zeqkX-zfALO5sMnVGrcBHcKzZ8T0NcAd2P8Fh2R6mMHdX_A]earlwbollinger@c...[/url
> Sent: March 22, 2004 6:13 PM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] Vibration Sensor
>
>
> What works pretty good is piezo film sensors. Such as those from
> http://www.msiusa.com/piezo/
> As you jiggle the film back and forth a varying voltage is generated.
> You can use an ADC to measure it or a comparator setup with a trip point
> to let you know when you've exceeded something.
> It's pretty cool.
> What I did was attach a small weight to the end of the strip to increase
> it's sensitivity to small movements. With the right weight it can detect
> small air movements in the room.
than $2 each! I ordered ten to allow for ham-fistedness. They look pretty
fragile.
I imagine they put out an AC signal? I can use an opamp to add an offset to
keep the voltage positive. Wondering how I'm going to actually catch the
peaks and valleys. I guess I could just spend a second continuously reading
the ADC then just keeping the highest and lowest readings obtained and
displaying those. Mr. Nyquist might turn a cold shoulder to me but...
Any thoughts?
>
Original Message
> From: Earl Bollinger [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8LWZxaMmVSZ0TSzESi8ueXQiDKmoREGtokD8x66zeqkX-zfALO5sMnVGrcBHcKzZ8T0NcAd2P8Fh2R6mMHdX_A]earlwbollinger@c...[/url
> Sent: March 22, 2004 6:13 PM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] Vibration Sensor
>
>
> What works pretty good is piezo film sensors. Such as those from
> http://www.msiusa.com/piezo/
> As you jiggle the film back and forth a varying voltage is generated.
> You can use an ADC to measure it or a comparator setup with a trip point
> to let you know when you've exceeded something.
> It's pretty cool.
> What I did was attach a small weight to the end of the strip to increase
> it's sensitivity to small movements. With the right weight it can detect
> small air movements in the room.