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01/26/05 11:44
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 		 #85791 - Question about Step motor, thanks
I am going to design a circuit for interfacing 8051MCU with a PM 20 Steps type stepping motor. In the datasheet, it shows me a circuit that using a Motor drive to drive the motor, but now i have to interface the MCU directly to the motor without the driver. Hence, i tried to use 4 pins from Port 1 (P1.0 to P1.3) to connect to the 4 pins of the motor, and tried writing code for generating the signal for the motor, but result was that the motor didn't move at all.

Does anybody what is wrong with that? And i have searched some example on the Internet, but all of them use a driver to drive the motor. And from this forum, i found a old post and someone said that
"you must upgrade your current with transistors
and use diodes to defend back emf "
Is it really needed??Any sample circuit for it?

Thanks in advacned.

The sequence:


List of 42 messages in thread
TopicAuthorDate
Question about Step motor, thanks            01/01/70 00:00      
   Get your thinking hat on            01/01/70 00:00      
      Detail            01/01/70 00:00      
         Are we nearly there yet?            01/01/70 00:00      
            look here also            01/01/70 00:00      
               checked..            01/01/70 00:00      
                  You got it.            01/01/70 00:00      
                     I have got it.            01/01/70 00:00      
                        I have studied some example..            01/01/70 00:00      
                           Why?            01/01/70 00:00      
                              Because...my supervisor            01/01/70 00:00      
                                 How about this design?            01/01/70 00:00      
                                    Maybe this also will help            01/01/70 00:00      
                                       This website is really useful            01/01/70 00:00      
                                    I doubt if it will fly            01/01/70 00:00      
                                       Thanks            01/01/70 00:00      
                                          do not forget            01/01/70 00:00      
                                             If i use an IC now            01/01/70 00:00      
                                                Saa 1027            01/01/70 00:00      
                                                   ULN2003?            01/01/70 00:00      
                                                      it must be your teacher            01/01/70 00:00      
                                                         No, is my supervisor            01/01/70 00:00      
                                                            unipolar/bipolar.            01/01/70 00:00      
                                                               4            01/01/70 00:00      
                                                                  stepper motors            01/01/70 00:00      
                                                                     not clear            01/01/70 00:00      
                                                                        4 lead motor            01/01/70 00:00      
                                                                           but            01/01/70 00:00      
                                                                              8 lead steppers            01/01/70 00:00      
                                                                                 DC drives            01/01/70 00:00      
                                                                              Unipolar / Bipolar            01/01/70 00:00      
   This might help            01/01/70 00:00      
   I had the same problem            01/01/70 00:00      
      Toasters            01/01/70 00:00      
         Toasters            01/01/70 00:00      
   PWM to drive the stepper motor            01/01/70 00:00      
      that is wrong            01/01/70 00:00      
         PWM Steppers ?            01/01/70 00:00      
            it's tough to google on 297            01/01/70 00:00      
               Brought to you by the letter L            01/01/70 00:00      
                  Try to check out this site            01/01/70 00:00      
   It is Impossible            01/01/70 00:00      

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