Operation method: 
 
Output ports: solenoid 1 (SV1) and solenoid 2 (SV2) 
Output type: adjustable duty cycle square wave 
Drag the duty cycle sliders to change the output duty cycles of SV1 and SV2. 
Drag the frequency sliders to change the output frequencies of SV1 and SV2. 
If you press Reverse, the stepper motor will rotate one step in reverse according 
to the hardware connection. If you press Positive, the stepper motor will rotate 
one step in the forward direction according to the hardware connection. 
*Remarks: Changing the duty cycle and frequency does not directly drive the stepper 
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