"Starting when shaking/falling" device, for hardware system

Hi all,

I am looking for some piece of hardware, quite easy to describe but quite tricky to find.
The idea is to activate some electronic hardware with a hard shake.
I was looking for some actuator with a conductive ball, but it's working with no force: just turning the device uspide down start the device, and this is not expected.
A tilt sensor could be interesting, but it is working with bending the device.
An accelerometer is interesting, but it consumes energy.

Well, I imagine a pure mechanical small device: conductive ball and an extended spring, with an impact, the spring compresses and the conductive ball makes contact... but I cannot find out any company selling it.

BTW, the size of the device should be quite small, like a 0805 or 1206 component.

Thanks a lot for your help.

Regards

I know what you need - I had a sample a while time ago for a project. It was a tiny tube with a spring in it. You could buy different sensitivities by having a stiffer spring. I will try to find details and post it later.

Keith

So, I am not the first one to think about it... :grin:
That's exactly what I am looking for. THX

http://www.robotroom.com/Light-Up-Shoes-Vibration-Sensor.html
http://www.rapidonline.com/Electron...-78-0767/?source=googleps&utm_source=googleps
**broken link removed**
http://uk.farnell.com/jsp/displayProduct.jsp?sku=607253&CMP=e-2072-00001000&gross_price=true
http://www.vxtrade.com/uk/dhl-usually-off-nc-vibration-switch.html

The sample I had was like this I think (it came from China):

**broken link removed**

Search for vibration switch (motion switch gets too many irrelevant results).

Keith.