Why is the stepper motor running so slowly（almost did not move）？

[yushengzhou]

I have a RasPI and a Revpi, Now I want to have a revpi controlled motor, but failed.
My code look like this:

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LinearActuatorDir_x =40
LinearActuatorStepPin_x = 38
def Forward_x():
    GPIO.output(LinearActuatorDir_x, 0)
    GPIO.output(LinearActuatorStepPin_x, 0)
    time.sleep(0.0003)
    GPIO.output(LinearActuatorStepPin_x, 1)
    time.sleep(0.0003)
   )
   

RevPI code is:

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LinearActuatorDir_x = "I_1"
LinearActuatorStepPin_x  = "I_2"
def Forward():
    rpi.io["LinearActuatorDir_x "].value = 0
    rpi.io["LinearActuatorStepPin_x  "].value = 0
    time.sleep(0.0003)
    rpi.io["LinearActuatorStepPin_x  "].value = 1
    time.sleep(0.0003)
    

Everything is the same except RevPI and Raspberry Pi, Why raspberry pie can drive, but revpi can't?

[RevPiModIO]

It is because of the cycletime! The RevolutionPi has a cycletime which is about 5ms (with 1 DIO on a RevPi Core3)!

So if you use RevPiModIO, you have to rise cycletime (default about 20ms) to 5 ms to be in sync with the real cyletime of the piBridge...

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rpi.cycletime = 5

BUT that means a minimum sleep of 0.005 :S

Maybe you could control you motor with the PWM function of the DIO/DO modules? https://revolution.kunbus.com/tutorials ... o-modules/

Configure the MEM values of the modules in piCtory and use the "PWM_1" Output to set the speed...

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rpi.io.PWM_1.vlaue = 0
rpi.io.PWM_1.vlaue = 255