Bipolar Stepper Motor Driver

The project drives a bipolar stepper motor with the use of a dual H-bridge IS such as the SN754410.

The bipolar stepper motors are usually identified on most steppers with 4 wires. Measuring the resistance of each wire using a multimeter is how the stepper’s wires are configured.

The proper wires from the stepper motor should be connected to the dual H-bridge chip where each coil acts as its own motor which is connected to the H-bridge pins 3 & 6 and 11 & 14 of the SB754410 IC. The usual +12V voltage supply of the motor is connected to Pin 8 of the SN754410. The circuit is recommended to be built for the BX-24 with the SN754410 on the same board while putting the power supply for the motor on a separate board. Doing this will require the ground from motor supply board to be connected to the board that houses the BX and dual H-bridge.

A voltage of 24V is required by this particular stepper motor. However, a lower voltage supply is used which sacrifices the torque. A radio shack AC/DC adaptor is used for placing the motor supply on separate breadboard.

Rest of the project