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Where can I find a source to buy lavet-style stepper motors?

Can I direct drive lavet-style stepper motors using the uC or do I need a driver IC?

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The problem is that if that eventual supplier stops selling lavet motors, the answers will become invalid and it makes these questions hard to mantain (as too localized) –  clabacchio Apr 24 '12 at 7:11
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@clabacchio - No, there is no single supplier of this motor. It's a type of motor used in watches. I think it's a perfectly good question. –  Rocketmagnet Apr 24 '12 at 12:21
    
@Rocketmagnet The problem is not if the supplier is single or not; shopping questions are discouraged as too localized and difficult to mantain up to date: meta.electronics.stackexchange.com/questions/375/… –  clabacchio Apr 24 '12 at 12:24

1 Answer 1

You'll need to consider how much current the motor takes, and compare it to the microcontroller's datasheet, which will state the maximum current draw on any pin.

Whatever you do, you'll also need to add a flyback diodes. When the MCU or driver attempts to changes the current suddenly, the coil will generate back EMF (a possibly large voltage). Since you will be using current in both directions, you'll need 4 diodes.

Diodes Coil

My advice though would be to use an H-Bridge chip.

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Aren't Lavet type stepper motors unidirectional? –  m.Alin Apr 24 '12 at 14:45
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@m.Alin - yes, they are, but the coil current is bidirectional. –  Rocketmagnet Apr 24 '12 at 15:13

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