Why does my stepper motor run that slowly?

Hi everyone,

I have a problem when I try to control my stepper motor with Matlab.

I use an Arduino Uno to control my motor and I try to communicate with my Arduino through Matlab : the fact is that my stepper motor runs but very slowly. However, it is not the case when I use the Arduino interface to communicate with my Arduino Uno : in this case, the motor isn't slow.

Here is my little program on Matlab :

clear all;

a = arduino('COM3','Uno','BaudRate',115200);

configurePin(a,'D2','DigitalOutput');

configurePin(a,'D5','DigitalOutput');

writeDigitalPin(a,'D5',1);

for i=1:500

writeDigitalPin(a,'D2', 1);

pause(0.0005);

writeDigitalPin(a,'D2',0);

pause(0.0005);

end;

writeDigitalPin(a,'D5',0);

for i=1:500

writeDigitalPin(a,'D2',1);

pause(0.0005);

writeDigitalPin(a,'D2',0);

pause(0.0005);

end;

I have tried to increase the BaudRate, however it wasn't conclusive.

If anyone has some device, I would be pleased!

[Ashu]

Have you tried to setup the servo motor like this ?

s = servo(a, 'D9');  % D9 is the pin where servo motor is connected 
writePosition(s, 0.5); % The position can be from 0 to 1