Driving a Stepper Motor with a Shift Register

• Stepper motors make their rotation in discreet steps. This stepping action is caused by digital levels on the motor inputs.
• Shift registers make excellent stepper motor drivers.
• The 74194 is a 4-bit register that can be parallel loaded with the correct binary pattern and then shifted left or right to determine the direction of rotation.
• The clock frequency of the shift register will determine the speed of the motor's rotation.

 

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