Stepper Motor driver + microprocessor

Ce circuit comprend un Atmega168, un FTDI pour la communication USB et un A3967SLB pour gérer un moteur bipolaire (4 fils). Tout le circuit logique est alimenté par le port USB, l'alimentation du moteur se fait de l'extérieur (7 à 30 volts 750mA) l'incrémentation de chaque step peut-être divisé par 8 grâce au microstepping ( http://www.zaber.com/wiki/Tutorials/Microstepping). Le circuit est compatible Arduino diecimila.

À propos de la A3967SLB;

The A3967SLB is a complete microstepping motor driver with
built-in translator. It is designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive capability
of 30 V and ±750 mA. The A3967SLB includes a fixed off-time
current regulator that has the ability to operate in slow, fast, or mixed
current-decay modes. This current-decay control scheme results in
reduced audible motor noise, increased step accuracy, and reduced
power dissipation.

The translator is the key to the easy implementation of the
A3967SLB. By simply inputting one pulse on the STEP input the
motor will take one step (full, half, quarter, or eighth depending on two
logic inputs). There are no phase-sequence tables, high-frequency
control lines, or complex interfaces to program. The A3967SLB
interface is an ideal fit for applications where a complex μP is unavailable
or over-burdened.

http://www.allegromicro.com/en/Products/Part_Numbers/3967/3967.pdf