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ECWAY TECHNOLOGIES 
IEEE PROJECTS & SOFTWARE DEVELOPMENTS 
IEEE PROJECTS & SOFTWARE DEVELOPMENTS 
OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE 
OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE 
BANGALORE / HYDRABAD 
BANGALORE / HYDRABAD 
CELL: 9894917187 | 875487 1111/2222/3333 | 8754872111 / 3111 / 4111 / 5111 / 6111 
CELL: 9894917187 | 875487 1111/2222/3333 | 8754872111 / 3111 / 4111 / 5111 / 6111 
Visit: www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com 
Visit: www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com 
STEPPER MOTOR CONTROL BASED ON PC COMMANDS 
ABSTRACT 
In this project the microcontroller which forms the heart of the project, plays an important 
role in establishing communication between the pc and the microcontroller. In this system a 
unipolar stepper motor is used (which is used widely in all kinds of floppy drives and CD 
drives) the use of single microcontroller to control the speed, direction and rotation angle of a 
stepper motor by sending pulse sequences to the motor winding in response to the control 
commands. 
Commands executed by the code in this application include: single step the motor rotates in a 
clockwise or counterclockwise direction (i. e. rotate the rotor through a certain number of 
degrees) when the corresponding key is pressed from the computer keyboard. This is a 
general purpose application for which a degree of adjustment or programmability is required 
to meet the needs of specific processes and their performances. This project consists of a 
stepper motor and a driver IC ULN 2003 that will drive the motor, However the 
Microcontroller lacks sufficient current to drive the stepper motor windings, so driver 
ULN2003 (U3) is used to energize the stator, based on the instructions typed by the user in 
the pc the stepper motor will rotate. In the pc we will type a command and based on the 
command the stepper motor will work.
BLOCK DIAGRAM

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Stepper motor control based on pc commands

  • 1. ECWAY TECHNOLOGIES IEEE PROJECTS & SOFTWARE DEVELOPMENTS IEEE PROJECTS & SOFTWARE DEVELOPMENTS OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE BANGALORE / HYDRABAD BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111/2222/3333 | 8754872111 / 3111 / 4111 / 5111 / 6111 CELL: 9894917187 | 875487 1111/2222/3333 | 8754872111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com Visit: www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com STEPPER MOTOR CONTROL BASED ON PC COMMANDS ABSTRACT In this project the microcontroller which forms the heart of the project, plays an important role in establishing communication between the pc and the microcontroller. In this system a unipolar stepper motor is used (which is used widely in all kinds of floppy drives and CD drives) the use of single microcontroller to control the speed, direction and rotation angle of a stepper motor by sending pulse sequences to the motor winding in response to the control commands. Commands executed by the code in this application include: single step the motor rotates in a clockwise or counterclockwise direction (i. e. rotate the rotor through a certain number of degrees) when the corresponding key is pressed from the computer keyboard. This is a general purpose application for which a degree of adjustment or programmability is required to meet the needs of specific processes and their performances. This project consists of a stepper motor and a driver IC ULN 2003 that will drive the motor, However the Microcontroller lacks sufficient current to drive the stepper motor windings, so driver ULN2003 (U3) is used to energize the stator, based on the instructions typed by the user in the pc the stepper motor will rotate. In the pc we will type a command and based on the command the stepper motor will work.