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DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using MatlabHello friends! I hope you all will be absolutely fine and having fun. Today, I am going to tell you guys that how to design a simple algorithm for DC Motor Speed Control in MATLAB by simply sending different commands to the serial port from Matlab to Arduino. In my previous tutorials, DC Motor Direction Control using Arduino, we have seen the direction control of DC Motor via Arduino. So, I would suggest you to first have a look at that tutorial before reading this one. Moreover, you should also have a look at DC Motor Direction Control in Matlab and DC Motor Speed Control using Arduino in which I have discussed in detailed about how to make simple and easy programs to control the direction of DC motor in both clockwise and anti clockwise direction.

I have also given a detailed discussion about the PWM (Pulse Width Modulation) concept as well as about the duty cycle of the digital signal. I have also discussed that how to control the speed of the DC motor using PWN pins of the motor controller L298 in Arduino software. So, you must go through my previous tutorials before going into the detail of today’s tutorial because I have used the same hardware setup and a bit changed Arduino source code. Now, in this tutorial I will elaborate you that how can you send different commands through serial port from Matlab to the Arduino. I will create a simple GUI having different buttons on it through the direction as well as the speed of the DC motor can easily be controlled. So, let’s have a look at DC Motor Speed Control in MATLAB:

DC Motor Speed Control using Matlab

Here, in this tutorial I will explain about how can make a program for DC Motor Speed Control in Matlab by creating a GUI having different buttons on it to control the direction of rotation of the DC motor as well as the speed of the DC motor by sending different commands through the serial port.

Note:

Since you are working on the DC motor so you must also go through my previous tutorials, they will be helpful for you to simulate this project as well:

Here, you can download the complete simulation for DC Motor Speed Control in Matlab by clicking on the button below.

Download MATLAB Simulation

GUI Design and Matlab logic Description
  • First of all I have created a very simple GUI (Graphical User Interface) in Matlab.
  • GUI has two different panels, Serial Port and Motor Controls. 
  • Serial Port panel has two buttons for opening and closing the serial port.
  • Motor Controls panel has five buttons for clockwise and anti clockwise rotation, accelerating and deaccelerating the DC motor and stopping the DC motory.
  • Screen shot of the simple GUI is shown in the figure below.

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • Then I made few of the changes by double clicking on all the buttons to make the GUI beautiful.
  • The updated GUI is shown in the figure below.

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • The figure shown above is the starting GUI when you just run the program.
  • You can see below, after entering different commands GUI updates its text according to the command sent to the serial port.
Source Code Description
  • First of all you must have to open the serial port by clicking on the button Start Serial. 
  • Go to the callback function of Start Serial button in the Matlab code.
  • Just copy and paste the source code given below, in its callback function.

  • Now, as you press this button GUI will update its text as Serial port is opened.
  • The updated GUI is shown in the figure below.

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • Now, go the callback function of Clockwise button inside the Matlab source code.
  • Just copy and paste the code given below in its call back function.

  • Now, if you press the Clockwise button the command will be sent from Matlab to arduino via serial port.
  • The GUI will update its text as Motor is rotating in clockwise direction.
  • The screenshot of the updated GUI is shown in the figure below.

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • Go to the callback function of C_Accelrate button and copy paste the code given below, in its callback function.

  • As you press the C_Accelrate button the command will be sent from Matlab to Arduino via serial port.
  • The GUI will update its text as Motor is accelerating.
  • If you press this button again and again, motor will continue to rotate at higher and higher speed.
  • The screenshot of the updated GUI is shown in the figure below.

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • Now, go the callback function of the C_Deaccelrate button in the Matlab source code.
  • Just copy and paste the code given below in the callback function of this button.

  • As you press the C_Deaccelrate button the command will be sent from Matlab to Arduino via serial port.
  • The GUI will update its text as Motor is deaccelerating.
  • If you press this button again and again, motor will continue to rotate at slower and slower speed.
  • The screenshot of the updated GUI is shown in the figure below.

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • Go to the call back function of the Stop Motor button inside the Matlab source code.
  • Copy and just paste the code given below in its all back function.

  • Now, if you press the Stop Motor button the command will be sent from Matlab to Arduino via serial port.
  • The GUI will update its text as Motor is stopped.
  • The screenshot of the updated GUI is shown in the figure below.

DC Motor Speed Control in Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

  • Go to the call back function of the Stop Serial button in the Matlab code.
  • Copy and just paste the code given below in its call back function.

  • At the end you must need to close the serial port.
  • As you press the Stop Serial button the serial port will be closed.
  • The GUI will update its text as Serial port is closed.
  • The screenshot of the updated GUI for DC Motor Speed Control in Matlab is shown in below figure:

DC Motor Speed Control using Matlab, Control Speed of DC motor using Matlab, Matlab to control the speed of the DC motor , DC motor speed control with Matlab, How to control the speed of the DC motor using Matlab

That’s all from the tutorial DC Motor Speed Control in Matlab. I hope you enjoyed this tutorial. If you face any sort of problem anytime, you can ask me freely without feeling any kind of hesitation. I will try my level best to solve your problem if possible. I will explore the Matlab by making different projects on it in my later tutorials. Till then, take care 🙂

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