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paulovale
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« on: May 05, 2013, 05:59:45 am »
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Anyone know what sensor can I use to know that a glass broke
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robtillaart
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« Reply #1 on: May 05, 2013, 11:05:58 am »
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A glass can break in a thousand ways, you need to be more specific
- what kind of glass
- what kind of damage
first thing that comes in mind is an accelerometer that just detect the force of an impact

You can also detect change in temperature of a wind flow or ...
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Duckie58
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« Reply #2 on: May 05, 2013, 01:59:43 pm »
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How about a thin trace of conductive ink on the inside surface of the glass?  Then it is a simple reading of an input to monitor the trace for continuity.
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paulovale
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« Reply #3 on: May 05, 2013, 02:17:37 pm »
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I am developing an alarm, when someone broke the glass, the alarme is active.
is a glass 1.5 millimeters with  2m a 3m

Quote from: robtillaart on May 05, 2013, 11:05:58 am
A glass can break in a thousand ways, you need to be more specific
- what kind of glass
- what kind of damage
first thing that comes in mind is an accelerometer that just detect the force of an impact

You can also detect change in temperature of a wind flow or ...
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afremont
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« Reply #4 on: May 05, 2013, 02:24:16 pm »
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Why not use an actual glass breakage sensor?  They make different types too.

On sale right now:
http://www.smarthome.com/7435WB/United-Security-Products-724-Window-Bug-Glass-Break-Detector/p.aspx
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« Reply #5 on: May 06, 2013, 04:30:34 am »
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These are some Application Note for the Texas Instruments MSP430
"A Robust Glass-Breakage Detector Using the MSP430"
http://www.ti.com/lit/an/slaa389/slaa389.pdf
"A Simple Glass Breakage Detector Using the MSP430"
http://www.ti.com/lit/an/slaa351/slaa351.pdf
MSP430 is a microcontroller that is somewhat similar to the Atmega used with Arduino,
maybe you will find some useful informations.
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