Glass Broke

Anyone know what sensor can I use to know that a glass broke

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 ...

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.

I am developing an alarm, when someone broke the glass, the alarme is active.
is a glass 1.5 millimeters with 2m a 3m

robtillaart:
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 ...

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

These are some Application Note for the Texas Instruments MSP430
“A Robust Glass-Breakage Detector Using the MSP430”

“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.