LudoMTR (Part 1)

Part 123456

LudoMTR is introducing a new sort of posts. The idea is to setup funny applications which require few hardware or electronic components and the simplest code. As per its name, ludo (from the latin verb ludere = play) motor enables a real minimal electrical engine.

This short video illustrates LudoMTR:

Few jumper wires, one resistor, 0.5 mm insulated copper wire, an Arduino and its prototype shield, that’s all you need!

How does this work?

LudoMTR applies the principle of the force resulting from an electrical current flowing across a magnetic field. This is the basic fundament of almost every electrical motor. A current flowing through the coil generates an magnetic field ‘through’ the coil. If we align a constant magnetic field with it, the coil will be attracted or expeled, depending upon the signs of the fields. The idea in LudoMTR is to generate an alternative current which will flip the coil so that its symetry axis aligns with the magnet’s field, shuts down the current so that the momentum of the coil keeps it turning, restore the coil current opposite to its previous state, shuts down the current , and so on, and so on…


The rotor consists in a circular coil made of ~10 turns of insulated copper wire (0.2 mm diameter) which terminaisons are oposite. The insulating material is removed from the terminals in order to allow a permanent electrical contact.
The rotor is placed on two conductive supports. Each of these is electrically connected to one set of pins from Arduino.
A constant magnet is placed beneeth the coil in order to generate a constant magnetic field. The stronger the magnet the best the chances to get LudoMTR working. Mine is taken from a broken hard disk (second life!)

– The moving coil must be very well balanced
– The magnet must be as close as possible from the moving coil
– Final adjustment may be a little bit tricky! Try again…


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