interfacing stepper motor with 8051 using keil c - at89c51.pdf

8/19/2019 Interfacing Stepper Motor with 8051 using Keil C - AT89C51.pdf

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(https://electrosome.com/wp-

content/uploads/2012/06/Stepp

Motor.jpg)

Stepper Motor

(https://electrosome.com/stepper-

motor/)

Interfacing Stepper Motor with 8051 using Keil C – AT89C51B Y E B I N G E O R G E ( H T T P S : / / E L E C T R O S O M E . C O M / A U T H O R / E B I N - G / ) / 1 0 C O M M E N T S( H T T P S : / / E L E C T R O S O M E . C O M / I N T E R F A C I N G - S T E P P E R - M O T O R - 8 0 5 1 - K E I L - C - A T 8 9 C 5 1 / # C O M M E N T S )

Android Microcontroller Project Kit

(https://electrosome.com/electronics-android-

pr oject-kit/) A Stepper Motor is a brushless, synchronous DC Motor. It

has many applications in the field of robotics and

mechatronics. The total rotation of the motor is divided intosteps. The angle of a single step is known as the stepper

angle of the motor. There are two types of stepper motors

(https://electrosome.com/stepper-motor/) Unipolar and

Bipolar . Due to the ease of operation unipolar stepper motor

is commonly used by electronics hobbyists. For more details

please read the article Stepper Motor or Step Motor

(https://electrosome.com/stepper-motor/). Stepper Motors

can be easily interfaced with a microcontroller using driver

ICs such as L293D (https://electrosome.com/l293d-

quadruple-half-h-dc-motor-driver/) or ULN2003

(https://electrosome.com/uln2003-high-voltage-current-

driver/).

Driving Unipolar Stepper Motor with 8051

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(https://electrosome.com/wp-

content/uploads/2012/06/Unipolar-

Stepper-Motor-Windings.jpg)Unipolar Stepper Motor Windings

Unipolar stepper motors can be used in three

modes namely the Wave Drive, Full Drive and

Half Drive mode. Each drive have its own

advantages and disadvantages, thus we should

choose the required drive according to the

application and power consumption.

Wave Drive

In this mode only one electromagnet is energized

at a time. Generated torque will be less when

compared to full drive in which two

electromagnets are energized at a time but

power consumption is reduced. It has same

number of steps as in the full drive. This drive ispreferred when power consumption is more

important than torque. It is rarely used.

Wave Drive Stepping Sequence

Step A B C D

1 1 0 0 0

2 0 1 0 0

3 0 0 1 0

4 0 0 0 1

Full Drive

In this mode two electromagnets are energized at a time, so the torque generated will be

larger when compared to Wave Drive. This drive is commonly used than others. Power

consumption will be higher than other modes.


3/18

Full Drive Stepping Sequence

Step A B C D

1 1 1 0 0

2 0 1 1 0

3 0 0 1 1

4 1 0 0 1

Half Drive

In this mode alternatively one and two electromagnets are energized, so it is a combination of

Wave and Full drives. This mode is commonly used to increase the angular resolution of the

motor but the torque will be less, about 70% at its half step position. We can see that the

angular resolution doubles when using Half Drive.

Half Drive Stepping Sequence

Step A B C D

1 1 0 0 0

2 1 1 0 0

3 0 1 0 0

4 0 1 1 0

5 0 0 1 0

6 0 0 1 1

7 0 0 0 1

8 1 0 0 1

3 Phase

Motor

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Supplier&Manufacturer

From China.

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4/18

Now we will see how to implement these drives.

Interfacing Using L293D

(https://electrosome.com/wp-content/uploads/2013/05/Interfacing-Unipolar-Stepper-Motor-

with-8051-using-L293D.jpg)

Interfacing Unipolar Stepper Motor with 8051 using L293D

This is the circuit diagram of driving a bipolar stepper motor using 8051 microcontroller using

L293D. 24MHz crystal is connected to provide the required clock for the microcontroller. 10μF

capacitor and 10KΩ is used to provide Power On Reset (POR) for the 8051 microcontroller.

L293D is connected to pins P2.0, P2.1, P2.2, P2.3 of the microcontroller and two pairs of

L293D are enabled by tieing EN1, EN2 to 5V. Logic Voltage (5V) is connected to Vss pin and

Motor Supply (12V) is connected to the Vs pin of L293D. Center Tap of each windings of

stepper motor is shorted and connected to the motor supply. Now we can energize each

winding of the motor by making corresponding pin of L293D LOW.

Interfacing Using ULN2003


5/18

(https://electrosome.com/wp-content/uploads/2013/05/Interfacing-Unipolar-Stepper-Motor-

with-8051-using-ULN2003.jpg)

Interfacing Unipolar Stepper Motor with 8051 using ULN2003

In this circuit instead of L293D, ULN2003 is used. Working is similar to the previous circuit,

when an input (say 1B) is HIGH corresponding output pin (1C) will be grounded. Thus we can

energize any winding of stepper motor.

Keil C Code For Wave Drive


6/18

#include

#include

void delay(int);

void main()

{

do

{

P2=0x01; //0001

delay(1000);

P2=0x02; //0010

delay(1000);

P2=0x04; //0100

delay(1000);

P2=0x08; //1000

delay(1000);

}

while(1);}

void delay(int k)

{

int i,j;

for(i=0;i


7/18

#include

#include

void delay(int);

void main()

{

do

{

P2 = 0x03; //0011

delay(1000);

P2 = 0x06; //0110

delay(1000);

P2 = 0x0C; //1100

delay(1000);

P2 = 0x09; //1001

delay(1000);

}

while(1);}

void delay(int k)

{

int i,j;

for(i=0;i


8/18

#include

#include

void delay(int);

void main()

{

do

{

P2=0x01; //0001

delay(1000);

P2=0x03; //0011

delay(1000);

P2=0x02; //0010

delay(1000);

P2=0x06; //0110

delay(1000);

P2=0x04; //0100

delay(1000);P2=0x0C; //1100

delay(1000);

P2=0x08; //1000

delay(1000);

P2=0x09; //1001

delay(1000);

} while(1);

}

void delay(int k)

{

int i,j;

for(i=0;i


9/18

(https://electrosome.com/wp-content/uploads/2013/05/Interfacing-Bipolar-Stepper-Motor-with-

8051-using-L293D.jpg)

Interfacing Bipolar Stepper Motor with 8051 using L293D

Keil C Code


10/18

3,796 people like this. Be the first of your friends.Like

#include

#include

void delay(int);

void main()

{

do

{

P2=0x01; //0001

delay(1000);

P2=0x04; //0100

delay(1000);

P2=0x02; //0010

delay(1000);

P2=0x08; //1000

delay(1000);

}while(1);

}

void delay(int k)

{

int i,j;

for(i=0;i


11/18

9 Comments 1

electroSome

+ 706

Follow +1

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12/18


13/18

Using UART of PIC Microcontroller – Hi

Tech C

•

— how can we send a text like "hi"

from one pic and receive it on another pic. i

m using pic 16f887. wanna send text and

Interfacing EM-18 RFID reader with

Raspberry Pi

•

— Sir, I have a EM-18 reader board

such as the one shown below. How can I

connect it to Raspberry Pi?

Using Push Button Switch – MPLAB XC8

•

— It will make the LED glow

continuously...

AM Generation using Matlab

•

— @Manoj Shenoy Thank

you so much for posting this. I am working

on a project for my subject and have

ELECTROSOME

• •

what might be the problem??

• •

febronia •

i want to interface synchronous motor with 89c51.. what type of driver circuit should be used

for runnig a synchronous motor..

• •

Rohan •

Hw big a stepper motor can be used with uln2003

• •

Ligo George • Mod

It depends upon the current rating of motor...I think ULN2003 can drive upto 1A... so

maximum current limit of motor is 1A..

• •

Rabindra Maharana •

thanks

RECENT COMMENTS

I have a doubt. I am unable to drive the motors by [..]

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14/18

GAGANDEEP SINGH KHANUJA (MAILTO:[email protected])

on Interfacing DC Motor with PIC Microcontroller using L293D (https://electrosome.com/dc-motor-l293d-pic-

microcontroller/#comment-5911)

SHUBHAM (MAILTO:[email protected])

on Blinking LED using PIC Microcontroller – MikroC (https://electrosome.com/led-blinking-pic/#comment-

5910)

QASIM ALKHAIRI (MAILTO:[email protected])

on USB PIC Programmer : PICKit2 (https://electrosome.com/pickit2/#comment-5909)

AKASH (MAILTO:[email protected])

on Interfacing EM-18 RFID reader with Raspberry Pi (https://electrosome.com/em-18-rfid-reader-raspberry-

pi/#comment-5908)

ANKIT KUMAR (HTTP://WWW.DOHACK.ORG/ABOUT)

on AM Generation using Simulink (https://electrosome.com/am-generation-simulink/#comment-5907)

VIKNESWARAN (MAILTO:[email protected])

on LED Chaser using PIC Microcontroller (https://electrosome.com/led-chaser-pic/#comment-5906)

sir if i want to count electric pulse on pic , so [..]

thnx...........

Could you explain how to connect multiple readers to RPi ? Thanks [..]

hi can you tell me how to convert it into vhdl code

I AM LITTLE BIT UNDER STAND THE PROGRAM

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15/18





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