Servo Motor

The DC motor is connected with a gear mechanism which provides feedback to a position sensor which is mostly a potentiometer. From the gear box, the output of the motor is delivered via servo spline to the servo arm. The potentiometer changes position corresponding to the current position of the motor. So the change in resistance produces an equivalent change in voltage from the potentiometer. A pulse width modulated signal is fed through the control wire. The pulse width is converted into an equivalent voltage that is compared with that of signal from the potentiometer in an error amplifier.

The difference signal is amplified and provided to the DC motor. So the signal applied to the DC servo motor is a damping wave which diminishes as the desired position is attained by the motor.

When the difference between the desired position as indicated by the pulse train and current position is large, motor moves fast. When the same difference is less, the motor moves slow.

The required pulse train for controlling the servo motor can be generated by a timer IC such as 555 or a microcontroller can be programmed to generate the required waveform. Refer Servo Motor interfacing with 8051 microcontroller and Servo control using AVR ATmega16.

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Comments (44)

Thanks for this article i was

Submitted by AHMED777 on Wed, 12/01/2011 - 00:25.

Thanks for this article i was searching about for servo motors and finally i found what i wanted to learn.

okay carry on...

Submitted by Anonymous on Sat, 16/06/2012 - 15:29.

okay carry on...

Hi there to all, the contents

Submitted by Anonymous on Wed, 18/07/2012 - 23:49.

Hi there to all, the contents present at this website are genuinely remarkable for people experience, well, keep up the good work fellows.

thanks for this article. i

Submitted by Gautam Padhiyar on Wed, 19/01/2011 - 10:58.

thanks for this article. i wanted to know about servo motors.......

thank you i fully understand

Submitted by yogeshvgec on Wed, 26/01/2011 - 00:56.

thank you i fully understand about servo motor very thanhs

give the detailed explain of

Submitted by naga24 on Thu, 27/01/2011 - 10:57.

give the detailed explain of electronic component in servo

very informative article

Submitted by san2244 on Sun, 30/01/2011 - 16:35.

very informative article

A article with all

Submitted by nehchal on Fri, 04/02/2011 - 02:14.

A article with all information about servo motor at one place.

hi sir this was really

Submitted by amit_kumar on Fri, 04/02/2011 - 18:11.

hi sir

this was really informative.I m using HS-311 servo mortors with ATMEGA 16 microcontroller.for making it rotate to 0degree i gave 0.33 us on pulse and 20 ms off pulse,for 90 degree i gave 0.95ms on pulse and for 180 degree......1.56 ms pulse.... it worked effectively.for2 servos i had to use 2 avr ports. i want to use 4 servos in only 1 port in ATMEGA 16,how can it be done without interfering with other servo's PWM??

super like.....its 2 good

Submitted by riddhi shah on Mon, 14/02/2011 - 14:12.

super like.....its 2 good ....

really i impressed with this

Submitted by srikranth on Wed, 09/03/2011 - 23:58.

really i impressed with this presentation

how will move servo from ic

Submitted by sunnykush1989 on Tue, 15/03/2011 - 06:30.

how will move servo from ic 555.

This Site has taken my

Submitted by harsha1712 on Sat, 30/04/2011 - 16:55.

This Site has taken my tension by giving such a worderful guidence @AVR.

i am really impressed with

Submitted by ehonda on Wed, 11/05/2011 - 16:49.

i am really impressed with the explanation of servomotor. i now see that its a step ahead of the dc motor we used back in the days

thanks

thank u it was really

Submitted by amarlokesh on Sun, 10/07/2011 - 09:46.

thank u it was really helpfull

Informative post on servo

Submitted by robinson on Thu, 21/07/2011 - 17:26.

^{Informative post on servo motors. This post will really help in selecting a servo and in manufacturing it. Generally, people have to face problem while selecting a particular servo according to their requirement. Thanks a lot for this wonderful post.}

very informative

Submitted by ahmed_kathiawari on Sun, 31/07/2011 - 11:12.

very informative article

should post some relative circuit diagram to check the servo's working

hi plz attach pdf form of

Submitted by s.sheikhahmadi on Wed, 03/08/2011 - 06:46.

hi plz attach pdf form of this artile for download tanx very informative article

nice information very

Submitted by puneetverma24 on Mon, 08/08/2011 - 21:01.

nice information very usefull

Thanks........

nice article

Submitted by Prasanjit Mandal on Wed, 24/08/2011 - 23:28.

nice article

this is a really nice to

Submitted by arpita_tiwri on Sat, 19/11/2011 - 19:13.

this is a really nice to learn all about the servo motor by the artical.

The post is really cool,

Submitted by naomiS on Sat, 26/11/2011 - 10:45.

The post is really cool, thanks for sharing it here. Good thing someone shared it so we can all use it as guide and future reference when it comes to servo motor.

Anyway, it's nice to know

Submitted by naomiS on Sat, 26/11/2011 - 10:46.

Anyway, it's nice to know that a lot of people shows interest at servo motors.:)

A very well done by the

Submitted by eromlig1991 on Sat, 24/12/2011 - 06:09.

A very well done by the author. A very informational article with clear a well structured literature. A real joy to read . Once again WELL DONE!

Hi, I am new to electronics

Submitted by vengence on Mon, 09/01/2012 - 14:40.

Hi,

I am new to electronics world i would like to know is there a way to reduce the speed of sservo motors without decreasing its toque.

Thanks in advance.

Regards

Hi sirIm using MG995 twoerPro

Submitted by unsbaloach on Thu, 12/01/2012 - 23:22.

Hi sir

Im using MG995 twoerPro servo motor interfacing with arduino.
im not getting result as programed
I connected red to +5v
brown to ground

& yellow for signal to arduinos pin 9

and want to rotate 20 degrees like this

for (i=0;i<=180; i=i+20)

move 20 degree

here is the complete program

Submitted by ronak2010 on Wed, 16/05/2012 - 08:19.

here is the complete program (i tested with arduino uno board with vs2 and v0006 servo)

#include <Servo.h>

Servo myservo; // create servo object to control a servo

int pos = 0; // variable to store the servo position

void setup()

{

myservo.attach(9); // attaches the servo on pin 9 to the servo object

}

void loop()

{

for(pos = 0; pos < 180; pos += 20) // goes from 0 degrees to 180 degrees

{ // in steps of 20 degree

myservo.write(pos); // tell servo to go to position in variable 'pos'

delay(15); // waits 15ms for the servo to reach the position

}

for(pos = 180; pos>=1; pos-=20) // goes from 180 degrees to 0 degrees

{

myservo.write(pos); // tell servo to go to position in variable 'pos'

delay(15); // waits 15ms for the servo to reach the position

}

thank you very much . this

Submitted by egnlife on Fri, 17/02/2012 - 08:47.

thank you very much . this article is so detailed, love it

hy siri'm using pic 16f877A

Submitted by umair_ilyas17 on Fri, 06/04/2012 - 22:42.

hy sir

i'm using pic 16f877A controller
i'wanna conrol a servo motor in such a way that pulses of different time period are given to motor ........
i'm using CCs compiler
i've confusion to make the code
any 1 help me please

engg_umair17@yahoo.com

i'm tHankful to yOUh.. .. ..

I GOT WHAT I M FINDING ABOUT

Submitted by Anonymous on Tue, 15/05/2012 - 13:11.

I GOT WHAT I M FINDING ABOUT SERVO MOTOR

thanks a lot

Submitted by Anonymous on Tue, 29/05/2012 - 12:54.

thanks a lot

Very good explanation. Better

Submitted by rubu10 on Thu, 07/06/2012 - 11:01.

Very good explanation. Better than text book and manual.

Very nice and awesome!

Submitted by Anonymous on Mon, 11/06/2012 - 21:29.

Very nice and awesome!

Really great post!!.Thank you

Submitted by Anonymous on Mon, 16/07/2012 - 11:04.

Really great post!!.Thank you for sharing this knowledge with us.Its a well written post i would share with my friends also.

i WANT TO CONTROL THE

Submitted by Anonymous on Wed, 18/07/2012 - 11:40.

i WANT TO CONTROL THE DIRECTION OF SERVO MOTOR USING ULTRASONIC SENSOR SO PLEASE HELP .. I AM DOING ARM 7 LPC2368

I recently came across your

Submitted by Anonymous on Wed, 25/07/2012 - 16:42.

I recently came across your blog and have been reading along. I think I will leave my first comment. I don’t know what to say except that I have enjoyed reading. Nice blog. I will keep visiting this blog very often.

Thanks and Regards,

Pharmaexpressrx.net

thanks for post

Submitted by Anonymous on Wed, 25/07/2012 - 17:55.

thanks for post

It does help me a lot knowing

Submitted by Anonymous on Thu, 26/07/2012 - 18:09.

It does help me a lot knowing that you have shared this information here freely. I love the way the people here interact and shared their opinions too

Very Useful article for

Submitted by sai.ray30 on Mon, 30/07/2012 - 15:59.

Very Useful article for beginners like me .....

Thanks

Sairam.

hi sir, i'm using pic 16f877A

Submitted by nataraj87 on Tue, 12/02/2013 - 09:52.

hi sir,

i'm using pic 16f877A controller..i'wanna conrol a servo motor in such a way that pulses of different time period are given to motor ........
i'm using hitech compiler.i've confusion to make the code.any 1 help me please.

i need 0 to 90 of rotation and 90 to 0 of rotation ... pls send me the code to ..

nataraj87@gmail.com..Pls reply me as soon as possible...

Thanks ......

I'm having trouble

Submitted by josh douglas on Fri, 15/02/2013 - 10:44.

I'm having trouble understanding what the sw 1 goes to in the first ic 555. Can u help?

please help me i want make

Submitted by soammn on Sat, 09/03/2013 - 00:13.

please help me

i want make robot arm by using servo motor but i donot know which servo model can be used and any type

servo which rotate 180 degree or 360 degree.

i will use pic16f877a .i want code for controll arm by micro c langague .

this website is remarkable. i

Submitted by jhanzaib on Fri, 19/04/2013 - 17:14.

this website is remarkable. i learnt a lot from this web

Can anyone tell me whether

Submitted by mayank_91 on Sun, 28/04/2013 - 09:10.

Can anyone tell me whether servo motor can be run by Atmega-16 ?

Servo Motor

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