5.1.1 Rotating Stepper Motor [one direction]

Hello Readers:

I have started this blog to show you Embedded C programming for 8051 family microcontroller using KEIL compiler. The KISS philosophy is used to write this tutorial. What is KISS? Keep It Simple, Stupid!

5. Motor Interface

This section teaches you how to write program for stepper motors and dc motors. In this section no flow chart diagrams are provided, so try to figure out the one from source code.

5.1 Stepper Motor

First we see how to write program for stepper motors.

5.1.2 Rotating Stepper Motor [one direction] 

The stepper motor interface with microcontroller chip is a demanding application. Because all embedded systems usually needs motors, viz., for controlling door, moving vehicles, controlling robotic arms etc. This program rotates the stepper motor in one direction, and direction is depended on the pin numbers of stepper motor. 

Start KEIL V4.01 and close projects, if any are open. Now start new project with Device -> Generic->8051 [all variants] for general 8051 family target chip. Add a new text file, name it Pgm_511.C and add it to above created project as a source file. It is time to add code to Pgm_511.C, so type below shown code in it.

   Code explanation:It sends coil winding activation signals to stepper motor connected to Port 2 pins continuously. Convert the numbers outputted into binary you will understand how alternative coils of stepper motor are energized so that it rotates in desired direction.  

After typing the code, press F7 or click Project->Build Target for building the source code. If there are no typical errors file will build successively and shows zero errors and zero warnings.

Now enter into debug mode by pressing Ctrl+F5 or click Debug->Start/Stop Debug Session menu. Our program is sending coil winding energizes signals to Port 2 continuously. So we want to watch the Port 2 pins while running this program for changing values. To get Port 2 tab click Peripherals->I/O Ports->Port 2 text.

Run the program by pressing F5 or clicking Debug->Run. You can see the changing values on Port 2 tab continuously in binary form. If you generate HEX file of this program, burn it into your target chip’s memory using suitable uploader and connecting stepper motor to Port 2 you can watch stepper motor rotating in desired direction. To stop running the program press red ‘x’ mark icon or click Debug->Stop.

To get back the compile mode press Ctrl+F5 or click Debug->Start/Stop Debug Session menu.  
<End of 5.1.2 Rotating Stepper Motor [one direction]> 

...till next post bye-bye & take care.