If you refer to the above figure, you can see that the tiny magnet is oscillates a little bit. However, the oscillations can be adjusted and the magnet can keep levitating for minutes, after a good calibration has been done on it.

For your information, the device uses a small Hall Effect sensor and its able to sense the field of the permanent magnet or using the information to modulate the magnetic field of the electromagnet.

During the developing project, the biggest challenge that you might face is to separate the sensor from the electromagnet. Honestly, you can get it done by hovering magnet or a magnetic dart.

Beside that, you should keep this on your mind that it’s quite hard to buy a small and cheap electromagnet. If you cannot find the suitable electromagnet, then you can buy a solenoid and tear it apart to get the coil inside of it.