Arduino - Magnet levitation

[freitasnetuno]

thats pretty

[josefbrettl]

Nechcete pr nas vyrobit vzorek linearniho pohonu s almag civkou, civkami, rizeny arduinem?

[plazmafeld]

Great, now can you build a frame for the magnet an big enuff to stand in, an steer us around floating on the earths magnetic field?

[coltononline]

I remember making one of these from a Nuts and Volts article. I was so stoked when I got it to work.

[kikishai]

dude can you post a video on how to make that elivating?

[DerUnbekannte]

great job!

[havocdaemon]

Now that was an awesome idea! Thanks for the vid!

[TD47]

YES!!! COMPLEX ANALYSIS! The bane of my existence.

Prove: e^jTh = 1 ftw!

[lecorfec]

Très joli, très instructif!!!

What is the resolution of your Hall sensor in your project and in a normal environnement (without "parasite magnetic field") ? I mean in term of output variation/ position variation dVout /d(x)

What is the working range of the Hall sensor with a standard NeFBo magnet?

thanks again for your contribution!

[npozar]

@lecorfec Hey, thanks for the interest. I actually don't remember exactly, it was such a long time ago. See my blog post for more details (linked from the video description). I used an external amplifier to increase the sensitivity and to use the whole range of Arduino analog inputs.

[CSPhysics]

VERY COOL! Are you using a Hall Effect Sensor to give feedback to the electromagnet?

[CSPhysics]

@CSPhysics --oh, yup. Should have read the blurb first. Great work!

[npozar]

@CSPhysics Thanks a lot. Yep, hall effect sensor it is, inside the ugly clay patch ;)

[jsbach333]

bad ass

[kleenextx]

very awesome



[hackman3000]

how'd you make the electromaget?, imean did you just hot glue a coil to a peice of metal? how?

[iwan0t0smith]

You could probably get away with just using the one coil and scrapping the hall probe. If you can measure the current accurately going through the coil you will be able to measure whether or not the magnet is moving since the magnet will induce a current in the coil and hence change the current going through the coil. By passing this data back into the arduino you could then change the current from the battery to change the strength of the magnet

[sanches2]

@iwan0t0smith i was thinking 'bout the very same method...

[CSPhysics]

@iwan0t0smith -ooh, hip idea. i guess you could try using the analog read... but it doesn't seem like the 0-255 resolution would be as sensitive as his set up.

[npozar]

@iwan0t0smith Thanks for the idea. The reason why this would be quite hard to implement though is that the current on the coil has to be adjusted based on the magnet's current position. Reading the induced current on the coil as you suggest can give you velocity only. One then integrate which would lead to an increased error over time. And the system is very unstable (it was damn hard to make this work as it is), with a lot of noise (such as 60Hz from the grid)...

[npozar]

@iwan0t0smith Not to forget, once the magnet is moving in either direction so that a current is generated and one wants to do something about it to prevent the motion, it's too late. It's takes some time to energize the coil (around ~50ms in my case), enough time for the magnet to fall.

[q7spiz]

Cool work you did. It was funny when you were flicking around the dart thingy. I always enjoy seeing what special things could be figured out in science.

[penguin86penguin86]

Gorgeous *.*

[mrmeval1]

One link is dead

[richardfirthucsb]

LOL at the books you are using to prop it up.

[danimal511]

Thermo is a good class

[MichiZ90]

watch "levitation board"!!!

[hla27b]

Excellent project

and very nice job on the web tutorial too.

keep up the good work

[metalcore13]

just awesome... Did you build the Hall effect sensor yourself?

[Pvsmuntje]

This is just awesome.

[numex106]

Awesome job man! Could you post some code like how you calibrated the readings and also where or how you built the electromagnet.

[mkillerz979]

so the magnet gets turned on and off really fast?

[centerorbit]

@mkillerz979 yes

[jeffreysquared]

cool!

[goompapa]

I loved the Director's commentary.

[tiptiptoptop13]

Excellent idea!

[fatass355]

nice

[fireraisr]

well done man, 5 stars

[Sdfrien]

seamanr101 you're a moron. It's practically impossible to get magnets at the exact distance apart. The word is spelled CERTAIN not serton. The rig involves an electromagnet that fluctuates to keep the object at the same distance. Learn your science before you try to comment on shit you don't know.

[npozar]

yey, I'd love to see that. Could you post a video?

[davorb]

Please post a video of it, mr seaman.

[gingrrr]

To seamanr101 - Dude you should have listened at school, you can't spell, use basic grammar or know anything about science.

Well done for being able to use a computer though - that's surprising.

[mminasian]

It's unclear to me why you need feedback at all? Is it constantly updating the coil's magnetic field strength based on the magnetic feedback of the sensor? If it is simply hanging from below, why are there other variables in keeping the thing in place?

[npozar]

It's an unstable system, that's why. If you didn't need any feedback at all, you could do the same thing with 2 permanent magnets. Post a video if you succeed.

[cyphre117]

permanent magnets would not work unless you placed the hanging magnet with micrometer precision. If it was out by a tiny bit it would slowly fall or rise to the top. so you need and electromagnet that can adjust itself accordingly.

[Crusoe92]

would you explain to me?how?

[kennyozakie]

dude that's ezy shit

[Chick6517]

you make me laugh.. for some reason i could stop laughing when i saw it. something about it just made me keep laughing. good job :)

[ssnatcherss]

Awesome! Control engineering at it's best. Now levitate a magnet from underneath...

[npozar]

Thanks for the views. At the moment, I'm developing a way to damp those annoying oscillations and it looks pretty good. I'll post an update soon and also, I'm gonna post a detailed description together with the source code.

[94thts]

Can i get a more in depth description of how this was done? A very cool project!

[RunawayRed]

This is relevant to my interests.

[Booshibonton]

LOL!

[XsamgX]

Do you mean interesting?

[aly9292]

my yahoo ID: aly_mafia2004 , add me , i like this