How to create function that control speed of stepper motor?

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safaa al-hafar
safaa al-hafar 2021-11-1
回答： surya venu 2024-8-28
Hello every one..
I want to control stepper motor using arduino and matlab and stepper motor driver l298d, but without using adafruit motor shield v2 library. so i write this code
delete(instrfindall)
close all;
clear;
clc;
prompt = 'How many steps to move? '; % enter number of steps to move
steps_to_move = input(prompt);
step_number = 0;
number_of_steps = 200;
last_step_time = 0; % the time of last step
whatSpeed = 60;
%% initialization arduino pins
a = arduino();
configurePin(a,"D7","DigitalOutput");
configurePin(a,"D6","DigitalOutput");
configurePin(a,"D5","DigitalOutput");
configurePin(a,"D4","DigitalOutput");
%% determine delay time and dirction
steps_left = abs(steps_to_move);
step_delay = uint64(double(60*10^6)/number_of_steps / whatSpeed) % time between steps
if (steps_to_move)
direc = 1;
else
direc = 0;
end
%%
timeVal = tic; % start counting time
while (steps_left > 0)
now = uint64(toc(timeVal)*10^6); % time of right moment
if(now - last_step_time >= step_delay) % if now - last step time bigger than delay time
% then move the motor
last_step_time = now; % store the time
if (direc == 1)
step_number = step_number + 1;
if (step_number == number_of_steps)
step_number = 0;
end
else
if (step_number == 0)
step_number = number_of_steps;
end
step_number = step_number - 1;
end
steps_left = steps_left - 1;
end
stepMotor(a,mod(step_number,4)); % function to move motor
end
function stepMotor(ardObj,thisStep)
switch (thisStep)
case 0 % step 1
writeDigitalPin(ardObj,"D7",1);
writeDigitalPin(ardObj,"D6",0);
writeDigitalPin(ardObj,"D5",1);
writeDigitalPin(ardObj,"D4",0);
case 1 % step 2
writeDigitalPin(ardObj,"D7",0);
writeDigitalPin(ardObj,"D6",1);
writeDigitalPin(ardObj,"D5",1);
writeDigitalPin(ardObj,"D4",0);
case 2 % step 3
writeDigitalPin(ardObj,"D7",0);
writeDigitalPin(ardObj,"D6",1);
writeDigitalPin(ardObj,"D5",0);
writeDigitalPin(ardObj,"D4",1);
case 3 % step 4
writeDigitalPin(ardObj,"D7",1);
writeDigitalPin(ardObj,"D6",0);
writeDigitalPin(ardObj,"D5",0);
writeDigitalPin(ardObj,"D4",1);
end
end
the motor does not move correctly, there is no control speed.
i write the code with help of stepper motor library for arduino.
so any one could help me to correct the code or using other equation or ideas??

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回答（1 个）

surya venu
surya venu 2024-8-28
Hi,
The direction logic seems incorrect. You should set "direc" based on the sign of "steps_to_move". If "steps_to_move" is positive, "direc" should be 1; if negative, it should be -1.
if steps_to_move > 0
direc = 1;
else
direc = -1;
end
Hope it helps.

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