In need of a vibration sensor?
Don’t want the complexity of an accelerometer?
How about a miniature implementation of an old-fashioned rattling-bits-of-metal switch.
Fuji has a very tiny (2x2x1.2) version called CMN200.
If this is a bit too fiddly to handle, there is the 10x10mm CMN200-K
evaluation board that can take a couple of flying leads, or a similar through-hole model – MN530-02S model
Looking at miceuz’ circuit (scroll down) and, while it is a neat idea, I balked at the use of a 10MΩ in a damp environment like an un-sealed bike light – as reduction of the resistor will shorten the time the light stays on.
So, one for those that live in deserts?
Also, it rather relies on low leakage through the tantalum.
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