Levitating Key-holder Shelf

You've surely seen some of those videos on youtube about levitating stuff.

In this Instructable, i will share with you the process of making a levitating key-holder shelf. It wasn't an easy build, since i am not good in electronics, but after some research it was done.

With the electromagnets in this settings you can levitate up to 34 Gr.

I hope every one will finde this useful.

( I will upload Pdf's, for the different cuts in this project, in a couple of days )

For making the box :

- some wood, i used a thickness of 3 mm.

For the Electromagnets :

- 5Volt-Regulator 78L05 x 3 ( 0,2 USD x 3 )

- hall sensor SS495 x 3 ( 4 USD x 3 )

- op-amp UA741 or LM348 x 3 ( 5 USD x 3 )

- P-channel MOSFET IRF4905 x 3 ( 1,25 USD x 3 )

- capacitor 10 uf x 3 + 100 n x 6 ( 4 USD x 9 )

- resistor 10 k + 100 k x 3 ( 0,1 USD x 6 )

- an electromagnet 15 mH, 2.4 Ω1.5 A maximum1.5'' diameter x 1.0'' length x 3 ( 14 USD x 3 )

- N52 neodymium disc magnet1/2'' diameter x 1/4'' thickness, 6 gNi coated x 3 ( 4 USD x 3 )

- a board for soldering components

TOTAL PRICE : 108, 2 USD

Otherwise you can buy a kit, a good place is from http://zeltom.com/products

a price for : 48 USD for a kit

I used a laser cutter from my friends school to cut the pieces, it is straightforward, i will attach the drawings here. otherwise just follow the steps.

The rings are made to hold the electromagnets in place.

The electromagnetic levitation controls the magnetic field generated by an electromagnet to levitate a small magnet in midair. The small magnet levitates in the air indefinitely without any disturbance.

The physics behind it is to simply provide a magnetic force which equal and opposite to the gravitational force on the object. The two forces cancel and the object remains suspended. Practically this is done by a circuit which reduces electromagnet force when an object gets to close, and increases it when the object is out of range.The vertical position of the levitating magnet is measured using a linear Hall effect sensor and the current in the electromagnet is controlled using a digital signal controller.

Since i am not good in electronics, I bought a kit from http://zeltom.com/products, . So i cannot share the schematics here. So i wont go in details here, since if you choose to buy the kit it is self explanatory.

But there is a lot of tutorials out there on how you can build your own levitation device, one of the best websites is this one : http://www.bis0uhr.de/projekte/schwebekugel/englis...

( the items of my component list are compatible with this schematics )

When the electromagnets are built, put them inside the box, inside the wooden rings, so they can be hold in place.

I will attach my pdf for the cuts. it is self explanatory. the aim is to build some wooden holders for the key rings,

Fill the box with electromagnets, and attach it to the wall, plug the power adaptor ( 12 v, 4 A ).

Enjoy