"STM32. Net MF Development Board Learning-11" stepper motor control (non-PWM mode)

The selected stepper motor model is 28byj-48 (or mp28ga,5v, speed ratio 1/64), the driving circuit selects the ULN2003 Chip's drive board, the control sequence diagram is as follows:

Four-Phase Eight beat: a->ab->b->bc->c->cd->d->da

Its a, B, C, d refers to the ULN2003 chip driver Board 1n1, 1n2, 1n3, 1N4, waveform on the expression of an input signal, waveform in the following indicates no input signal.

We use the Red Bull Development Board for Stepper motor control, in order to facilitate wiring, we need to be in the Red Bull Development Board welding Two 30-foot double row array, after the welding of the infrared board as follows: