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Mrfixits writes:

This Valentine instructable shows a pair of Hearts that unite to become one! The homopolar motor is the simplest form of electric motor, consisting of a battery, a conductor, and a magnetic field. The flat Heart shape is the most basic of homopolar motors. The Heart with legs is the next most simple shape. With a little ingenuity, the two shapes can be combined to unite into one spinning body. In this Instructable, I show how to make this special 2-piece homopolar motor with a bass speaker, some coins, a battery and two pieces of copper wire. A neodymium magnet can also be used instead of the bass speaker and coins. This is a great display for Valentines Day…or any day of the year!

Becky Stern

Becky Stern is head of wearable electronics at Adafruit Industries. Her personal site:



  1. theophrastus says:

    Very nice setup!
    (no metaphor intended for one heart is easier to get going than two?)

    So who’s up for the vector analysis to explain which direction these motors choose to turn? (right hand rule? left foot blue?)

  2. drewski_brewski says:

    I like this, but something in me revolts at a short-circuited battery. It’s really hard to enjoy it while the voice in my head screams, “Ahhhhh! the battery is going to fry and be dead in a minute or two!”

  3. timbudtwo says:

    If you are going to be that critical, then there isn’t a battery in that video anywhere.

    Cool vid, bad music. Maybe I’m just too young, but the music was a drag.