I'll look at clock pendulum constructions. Although in this case the forces are applied to the pendulum axis so it's completely different.Sorry, I got lost: When you refer that neodymium magnet, are you addressing the issue of restricting the pendulum movement in order to try to keep it linear and parallel to the wall? Or are you talking about stimulating the pendulum?
I hope all these magnets and electromagnets don't mess up the digital frame image Nuno
How can I use the same electromagnet both as a sensor and actuator at the same time in Arduino?
Any advice on which electromagnet and magnet to buy? and where? (european websites prefered)
BTW, the distance between electromagnet and magnet can't be very big. Is your display going to be in between them?