144. microcontroller based clockwise anticlockwise

MICROCONTROLLER BASED CLOCKWISE/ANTICLOCKWISE STEPPER MOTOR

CONTROLLER USING PC KEYBOARD VIA COM PORT

Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad www.kresttechnology.com, E-Mail: [email protected] , Ph: 9885112363 / 040 44433434

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mailto:[email protected]

http://www.kresttechnology.com/

AIM:

The main aim of this project is to design Microcontroller Based Clockwise/Anticlockwise

Stepper Motor Controller Using PC Keyboard via Com Port.

PURPOSE:

Computer controlled stepper motors are one of the most versatile forms of positioning

systems. Open loop control of stepper motors suffers from a major disadvantage that the rotation

of the rotor becomes oscillatory and unstable in certain speed ranges. This paper presents the

micro stepping technique which overcomes the problem of instability and at the same time

provides high accuracy for micro stepping applications. This technique improves electronically

resolution of the stepper motors and suppresses oscillations due to effects of mechanical

resonance. This has greatly enhanced its usefulness in modern control applications.

BLOCK DIAGRAM:

MAIN SECTION:


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8051

Microcontroller

Power supply

PC

Stepper motor

Motor driver

ULN2003MAX232



POWER SUPPLY:

DESCRIPTION:

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 based on

that command.


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Step DownTransformer

BridgeRectifier

FilterCircuit

Regulator section



SOFTWARES:

1. Embedded C

2. Express PCB

3. Kiel IDE

4. Uc-Flash or ISP

HARDWARE USED:

1. Micro Controller

2. Power Supply

3. Stepper motor

4. ULN2003

5. MAX 232

RESULT:

Hence, the implementation of micro stepping for a standard stepper motor is presented

in this paper. The key feature of this controller lies in its flexibility to provide for high position

resolution operation of a given stepper motor control system. In the case of retrofitting an

existing standard stepper motor controller to a high position resolution controller, the technique

presented here appears to be an excellent consideration. The controller is capable of controlling

multiple stepper motors simultaneously with very precise resolution.


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144. microcontroller based clockwise anticlockwise

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