Error while operating stepper motor

Hello,

I want to control stepper motor using matlab, arduino hardware and l293d driver.

I write simple code to supply the driver with appropriate pulses, the motor move but not in the correct way and the speed is fixed dispite of value of delay time between steps. this is the code below. I test the code in arduino ide it work fine and the stepper fully controlled, but i don't know why in matlab it doesn't work. any one help

clear;
clc;
delay_time = 0.001;   % delay time between steps

%% Initialize arduino pins
a = arduino("COM6","Mega2560");
configurePin(a,"D8","DigitalOutput");
configurePin(a,"D9","DigitalOutput");
configurePin(a,"D10","DigitalOutput");
configurePin(a,"D11","DigitalOutput");

%% move stepper motor step by step with delat time 1ms
while 1
       % first step
       writeDigitalPin(a,'D8',1)
       writeDigitalPin(a,'D9',0) 
       writeDigitalPin(a,'D10',1) 
       writeDigitalPin(a,'D11',0)
       pause(delay_time)
       % second step
       writeDigitalPin(a,'D8',0)
       writeDigitalPin(a,'D9',1) 
       writeDigitalPin(a,'D10',1) 
       writeDigitalPin(a,'D11',0)
       pause(delay_time)
       % third step
       writeDigitalPin(a,'D8',0)
       writeDigitalPin(a,'D9',1) 
       writeDigitalPin(a,'D10',0) 
       writeDigitalPin(a,'D11',1)
       pause(delay_time)
       % 4th step
       writeDigitalPin(a,'D8',1)
       writeDigitalPin(a,'D9',0) 
       writeDigitalPin(a,'D10',0) 
       writeDigitalPin(a,'D11',1)
       pause(delay_time)
end

Answer 1

[Shreshth]

Hey Safaa,

It appears that u are looking to control stepper motor using MATLAB and L293D driver.

MATLAB handles the timing and digital pin writing compared to the Arduino IDE. MATLAB might not be able to achieve the precise timing required for controlling the stepper motor, resulting in the motor not moving correctly or at a fixed speed regardless of the delay time.

I would recommend you to install the support package for ardunio hardware and then try to control the motor.

You can use L293D motor block controls to control the motor.

Kindly refer to the below mentioned resources from MathWorks to understand about the support package and controlling motor using Arduino board.

http://www.mathworks.com/help/simulink/supportpkg/arduino_ref/l293ddcmotor.html

http://www.mathworks.com/matlabcentral/fileexchange/59110-stepper-motor-control-with-arduino

http://www.mathworks.com/videos/using-matlab-and-arduino-for-motor-control-100737.html

Hope it helps.