When a stepper motor requires a sequence of four different on-off combinations (e.g., wire 1 on, 2 on, 3 off, 4 off) cycled repeatedly to continue rotating, is a group of four
![Controlling Stepper Motors Using Power IO Wildcard, C Library Functions and MOSFET Drivers for Four-phase Six-wire Unipolar Permanent-magnet Stepper Motor Controlling Stepper Motors Using Power IO Wildcard, C Library Functions and MOSFET Drivers for Four-phase Six-wire Unipolar Permanent-magnet Stepper Motor](http://www.mosaic-industries.com/embedded-systems/_media/microcontroller-projects/stepper-motors/stepper-motor-operation.png)
Controlling Stepper Motors Using Power IO Wildcard, C Library Functions and MOSFET Drivers for Four-phase Six-wire Unipolar Permanent-magnet Stepper Motor
![delay - Bipolar stepper motor: What should the sequence timing be? - Electrical Engineering Stack Exchange delay - Bipolar stepper motor: What should the sequence timing be? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/O3elU.png)