When I try to setup the period with a value under 40, then the stepper <http://www.pololu.com/product/1200> motors stop moving and start vibrating like they are missing steps. By looking at the ShoeBot app, it seems that Ytai is able to set the period as low as 15. I using 2 of these DRV8834 <http://www.pololu.com/file/0J617/drv8834.pdf> Low-Voltage Stepper Motor Drivers with a 1/8 microstep resolution; which are a little bit different to the A4988 <http://www.pololu.com/file/0J450/a4988_DMOS_microstepping_driver_with_translator.pdf> drivers used on the ShowBot. However, I don't think they are imposing this limitation. My app also uses a CLK_62K5 clock and the loop() method updates the period every 2ms.
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