Simple proof of concept wind meter using your phones compass. The spinning magnets change the magnetic field around the phone which is picked up by your phones magnetometer. 

Check out vavuud website to look at real deal which you can purchase to support the application.  They have tested their one in a wind tunnel so it's quite accurate.

Step 1: Shopping

From you local dollar shop you should be able to get most of the stuff you need.

2 sets of measuring spoons, I used 2 x 5ml spoons.

Neodymium magnets (the shinny strong ones) I got mine out of a fishing game

Small bearings, I got mine for a couple of dollars from a model shop, but you can get them from some toys as well.

A few old pens.

3.5mm headphone jack ( cheap headphone will work)

Other tools you need are scissors, soldering iron, small hack saw.

The changing magnetic field is picked up by the phones compass/mangometer
It's a great concept and good job finding household stuff to build it.<br><br>The one from vavuud is neat but I don't see it as more then that. I've seen other measurement attachments for iPhones before but they all have the same problem...the accuracy is never sufficient to meet the standards that they would need to be used in a professional technical field. This flaw, to me, makes them neat, but a waste of money.
How does it work?
How does it work?

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