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To all the electronic nerds out there: I am trying to trigger a 555 timer by movement in a random direction that also occurs randomly and any change in position should trigger the 555. AFAIK tilt switches are not useable here. Does this idea make sense?
Ferrite core In orange, spool in blue.
Would there be a voltage generated by movement if the core is suspended by some kind of spring or rubber band?
The idea being to play a sound from a df mini player by pulling a pin high for 3 seconds.
No, moving a ferrite core through a coil won't generate a voltage. You would need to move a magnet to generate a voltage.
Look for a vibration switch like one of these. If you want more control, you could use an accelerometer and a microcontroller to trigger it from a specific amount of movement.
I haven't done a course in electromagnetism yet, but as far as I understand, the ferrite core is just a piece of metal with no magnetic field, so moving it doesn't induce a voltage
I think it would, however, change the inductance, just like the iron core in a transformer does
No, that won't work.
A vibration switch will work.
If that's not sensitive enough, another option is using a piezo element coupled to the case to detect vibration, with an op-amp or hex inverter to buffer + trigger the 555. However if you couple it too closely with e.g. the floor or furniture it will pick up nearby footsteps or cars. Might be good depending on the situation.