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Interfacing Stepper Motor with 8085



Stepper motor is an electromechanical device that rotates through fixed angular steps when digital inputs are applied. It is suitable for precise position, speed and direction control which are required in automation system.

The angle through which stepper motor rotates with a fixed angle for each digital data is called step angle.

Different stepper motor has different step angle. The more frequently used stepper motor has step angle of 0.9 degrees and 1.8 degrees.

Depending on the sequence applied to stepper motor, it can be classified in two category:

1. 4- Step sequence or full step sequence
2. 8- Step sequence or half step sequence


Calculations:
1. Total no. of steps=

Ex: = 200 steps are required to complete one rotation

2. Total no. of repeated steps=

Ex: = 50 repetition of sequence = (32) in Hexadecimal.