I'm building a small interactive exhibition display for a museum. The showcased artifacts are protected against theft with a metal security recoiler like this:
If a visitor picks up one of the artifacts, I want to show educational information on a screen. Since all artifacts are secured with a security recoiler, I want to use the movement of the security wire as a trigger.
Ideally I don't want to modify the existing security recoilers.
I have a mechanical solution which is not super robust, that's why I'm looking for a pure electronic solution (Hall-Effekt, etc).
Since these anti-theft wires are open-ended I'm not sure if I could use something like hall-effect sensor etc.
Any ideas are welcome. Maybe there is a better type of sensor.