c program for rotating stepper motor to particular angle in 8051 microcontroller

[ankit_265]

Sir, i am having stepper motor of 2 degree step angle.
I m using following c program:

#include<reg51.h>
void main()
{
while(1)
{ void delay (int);
P1=0xCC;
delay(1);
P1=0x66;
delay(1);
P1=0x33;
delay(1);
P1=0x99;
delay(1);
}
}
void delay(int a)
{
unsigned int x,y;
for(x=0;x<10;x++)
for(y=0;y<a;a++);
}


But i want to rotate it to 80 degree only. I want to stop motor at 80 degree.
Please give me the c program for this....??

 

[jayanth.devarayanadurga]

If it steps 2 degree and you want 80 degree then 2 * 40 = 80. Use a counter and count from 1 to 40 and stop the execution of motor code if count is > 40. i.e., put you motor code inside if(cnt <= 40) and before that initialize cnt to 1.

 

[ankit_265]

thank u for your valuable reply.....
bt m having problem for increasing the speed of rotation, I am using following code for delay :

void delay(int a)
{
for(i=0;i<1275;i++)
for(j=0;j<a:j++);
}

But when i am putting minimum value of a i.e. a=1, then i m getting the speed of 5.5 rpm.....
So please tell me how can i increase the speed of rotation more than 20 rpm

 

[jayanth.devarayanadurga]

Just use the proper value for a. The other way is to use a timer to generate delay.

 

[MANO.5]

thank you very much.it was really helpful for me also.you mean put the the stepper sequence within a for loop..right????

 

[embpic]

What are the controls are there in stepper driver?
if u wanr to do any other work while running stepper u can follow this one.
if it have clock/pulse then use timer to genrate pulse and use one count and check for 80 and toggle pin which is connected to driver pulse/clock.after it reach to 80 stop timer to stop pulse or use any condition to to stop pulses.
80 count is taken beacuase it will give 50% duty cycle.

 

[pratti]

IF I AM USING SEPARATE FUNCTION FOR ROTATING AND IF I WANT TO COUNT THE STEP,THEN WHERE SHALL I USE COUNTER?IN THE FUNCTION OR IN THE ACCESSED PART?
//HERE
CLOCK();
OR
//CLOCK()
P0=0xCC;

AND I WANT TO DENOTE THE POSITION OF STEPER MOTOR ACCORDING TO THE COUNTER LIKE AS BELOW
WHILE(1<=COUNT<=30
POSITION=1;
WHILE(31<=COUNT<=50)
POSITION=2;
HOW TO DO IN AT89C51 IN C

 

[embpic]

use clock pulses in interrupt isr keep moderate freq. and use counter in isr only.
what are input to.stepper driver?

 

[pratti]

port 2.1,p2.2,2.3,2.4
isr means??