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Stepper motor controller

 
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davevu22
Guest
Stepper motor controller
PostPosted: Fri Nov 30, 2007 12:36 am     Reply with quote
I have a 6 wire stepper motor and I connect both center tap to 12V. My motor is a 1.8 degree so one rev would be 200 steps but i'm not getting that. My motor turns 1 rev per 50 steps and I'm not sure why. Here is my code.

Code:
#include <16F777>
#DEVICE ADC=8
#fuses INTRC_IO, NOWDT, NOPROTECT, NOBROWNOUT, NOMCLR
#use delay(clock = 8000000)
setup_oscillator(OSC_8MHZ);


main()
{
//int sequence[8] = {7,6,14,12,13,9,11,3}; //good
//int sequence[8] = {8,10,2,6,4,5,1,9}; // my own
int sequence[8] = {10,6,5,9};
//int sequence[4]={5,9,10,6};
//int sequence[8] = {10,8,9,1,5,4,6,2};
int i=0;
int16 c=0;
   while(1)
   {
      delay_us(2000);
      output_B(sequence[i]);
      i++;

      if (i>3)
      {
         c++;
         i=0;
      }

      if (c==500)
      {
         c=0;
         delay_ms(1000);
      }


   }
davevu22
Guest
PostPosted: Fri Nov 30, 2007 12:38 am     Reply with quote
For the code above, i'm telling the motor to turn 10 times and stop for one second. The C=500 should be C=200 if it takes the motor 200 steps per rev.
Wierd.
davevu22
Guest
PostPosted: Fri Nov 30, 2007 12:39 am     Reply with quote
davevu22 wrote:
For the code above, i'm telling the motor to turn 10 times and stop for one second. The C=500 should be C=200 if it takes the motor 200 steps per rev.
Wierd.


Sorry I mean C=2000
Ttelmah
Guest
PostPosted: Fri Nov 30, 2007 3:29 am     Reply with quote
When does C increment?.
Think about it, you are incrementing C, every four times round the loop (when i>3). Not suprising that the motor goes four times further than you expect.....

Best Wishes
davevu22
Guest
PostPosted: Fri Nov 30, 2007 11:12 am     Reply with quote
To complete one step, don't you need to go output value 10,6,5,9 to port B? Its a full step sequence.

From what i've read, to make the motor turn 1.8 degree (1 step) I would have to output this sequence 10,6,5,9. I don't think the motor would step 1.8 degree if I just output 10. Would it? I'm at work so I guess I'll try it later.

Thanks.
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