Stepper Motor Stepping Modes
Stepper Motor Connections: Unipolar motor should have five or six connections depending on the model. If the motor has six connections like the one pictured above, you have to join pins 1 and 2 (red) together and connect them to a (+) 12-24V voltage supply. The remaining pins; a1 (yellow), b1 (black), a2 (orange), b2 (brown) should be connected to a driver (ULN2003 etc). Stepper Motor Connections Stepping Modes: There are several stepping modes that you can use to drive the stepper motor. Single Stepping - the simplest mode turns one coil ON at a time. 48 pulses are needed to complete one revolution. Each pulse moves rotor by 7.5 degrees. The following sequence has to be repeated 12 times for motor to complete one revolution. Pulse Coil a1 Coil b1 Coil a2 Coil b2 1 ON 2 ON 3 ON 4 ON High Torque Stepping - high power / precision mode turns ON two coils on at a time. 48 pulses are needed to complete one revolution. Each pulse moves rotor by 7.5 degrees. The follow...