strange title i know :) sorry about that.
so, what i would like to do, is a garden installation.
the idea would be like this: several carbon tubes, diameter 5mm, length between 1 and 2 meter, and on top a LED. the tubes are fixed in the ground. when the tubes are bent, from the wind, or by hand, the LEDs on top would flash or blink or shine with different strenght (PWM like)
any ideas how i can measure if the are bent?