GSAS Stepper Motor Interface

The GSAS Stepper Motor Interface (IF-STEP) is a complete stepper motor control kit that includes a 3Kgcm torque stepper motor, a dedicated driver circuit, and a power adapter, everything needed for stepper motor interfacing experiments without any additional hardware procurement. Students program the microprocessor to generate the precise coil energisation sequences required for stepper motor operation, controlling step mode (full-step or half-step), rotation direction, stepping speed, and angular position. The module connects to GSAS microprocessor trainer kits through the standard bus connector, with the driver circuit translating the trainer’s logic-level I/O signals into the current levels needed to drive the motor windings.

Stepper motor control is one of the most technically rich interfacing experiments in the microprocessor curriculum, requiring students to understand electromagnetic coil sequencing, timing precision, and the relationship between step rate and torque. The IF-STEP module enables a full progression of experiments: basic full-step operation with the standard 4-step coil sequence, half-step mode for doubled angular resolution, direction reversal by reversing the sequence order, speed control by varying the inter-step delay (from slow stepping where individual steps are visible to smooth continuous rotation), acceleration ramp profiles for high-speed operation without stall, and precise angular positioning by counting steps from a reference point. These concepts are directly applicable to CNC machines, 3D printers, robotic arms, and any positioning system that uses stepper motors, making this one of the most industry-relevant experiments in the embedded systems lab.

Specifications

Parameter	Value
Part Number	IF-STEP
Motor	Stepper motor, 3Kgcm torque
Step Modes	Full-step, half-step
Driver Circuit	2N3055
Direction	CW/CCW software defined via MP/MC Program
Speed Control	Software-controlled inter-step delay
Power Adapter	Included (for motor drive)
Bus Interface	Standard GSAS trainer bus connector
Includes	Stepper motor, driver circuit, power adapter, cables

Lab Experiment Coverage

Experiment Category	Topics
Full-Step Drive	4-step coil sequence, wave drive, two-phase drive
Half-Step Drive	8-step sequence for doubled angular resolution
Direction Control	CW/CCW rotation by sequence reversal
Speed Control	Inter-step delay variation, speed vs. torque tradeoff
Acceleration Ramps	Linear/S-curve ramp profiles to prevent stall
Position Control	Step counting, angular positioning, return-to-home

Compatibility

The IF-STEP module connects to all current GSAS microprocessor trainer kits through the standard expansion bus connector:

• GSAS 85A Microprocessor Trainer
• GSAS 86E Microprocessor Trainer
• GSAS 51E Microcontroller Trainer

The included power adapter provides the motor drive voltage, no additional power supply procurement is needed.

Why GSAS

GSAS manufactures the Stepper Motor Interface in Bangalore as part of its motor and control peripheral module range. The IF-STEP is the most complete stepper motor kit in the GSAS interface module range, including the motor, driver, and power adapter eliminates the procurement variability and compatibility issues that arise when labs source these components separately. The 3Kgcm torque motor is substantial enough for students to feel the holding torque and observe the difference between full-step and half-step smoothness, while the driver circuit provides thermal protection for sustained lab use. The GSAS education products team provides lab manual content for stepper motor control experiments aligned with Indian university embedded systems and mechatronics curricula.

Products are available for immediate purchase through the GSAS online store (“Buy on Store”) or through direct engagement for institutional and volume orders (“Request Volume Pricing”).