The simplest way of interfacing a unipolar stepper to Arduino is to use a breakout for ULN2003A transistor array chip. The ULN2003A contains seven darlington transistor drivers and is somewhat like having seven A stepper motor consists of a permanent magnet sandwiched between the two rotor halves (causing axial polarity), which make up the spinning part of the motor, placed into a stator housing where the stator coils of wire make up the different motor phases. Lin stepper motors have two phases, where each phase has four coils. stepper motor can be easily controlled by a pulse input drive which can be a 2-flip-flop logic circuit operated either open or closed loop. Operated at a fixed frequency, the electrical input to the motor is a 2-phase 90° shifted square wave as shown below in Fig. 3. Figure 1: Cutaway 2∅— Permanent Magnet Stepper Motor. A stepper motor is an electrical motor which converts electrical input in the form of series of pulses into discrete angular movements, commonly called as steps. This conversion is on one to one basis i.e. the motor moves through one step for each input pulse. The pictorial view of the stepper motor is shown in Figure 1. Fig. 1: Stepper Motor. This is especially true for larger motors. In the case of the Buildbotics CNC Controller the maximum current is 6 amps for any individual motor port. The following diagram shows the connections to be made for an 8-wire series connected bipolar stepper motor. The next diagram shows the connections for an 8-wire parallel connected bipolar stepper PDF Manual Unipolar Stepper Motor Driver Kit. Unipolar Stepper Motor Driver Kit â€" CK1405. Unipolar Stepper Motor Driver Kit. Standard circuit to driver unipolar stepper motors with 5, 6 or 8 wires. Uses 4 IRFZ44’s. Can be operated in free-standing or PC-controlled mode. Uses standard IC’s: 4013, 4030 and 4093. drive the current in one winding of a bipolar stepper motor. The UC3717A has been modified to supply higher winding current, more reliable thermal protection, and improved efficiency by providing inte-grated bootstrap circuitry to lower recirculation saturation voltages. The diagram shown below presents the building blocks of the UC3717A. complicated due to the need for a 6-wire unipolar stepper motor to have its center tap wires connected to the positive voltage source. Caution: Due to the low resistance windings used in stepper motors, care must be taken to make sure that the current delivered to the board does not exceed 2A. The basic wiring diagram is shown below in Figure 2 Stepper Motor Control using 8051 Microcontroller I. Summary The main principle of the project and its circuits is to rotate the stepper motor step wise at a particular step angle. The project will be using a ULN2003 IC and the L293D Motor Driver to drive the stepper motor as the controller cannot provide current required by the motor. II Motor Wiring Diagram The standard stepper motors offered by Thomson come in a four wire, bipolar configuration, as illustrated in Figure 2 and Table 2. Connecting to the stepper motor will require a bipolar compatible driver to be interfaced with the flying leads coming from the motor. The circuit diagram of interfacing a Bipolar Stepper Motor with 8051 Microcontroller and L293D Motor Driver is shown in the image below. Components Required AT89C51 (8051 Microcontroller) L293D Motor Driver 5V Bipolar