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(http://electrosome.com/wp-

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Servo Motor (http://electrosome.com/servo-motor/)

24 AUG Interfacing Servo Motor with PIC Microcontroller – MPLABXC8BY LIGO GEORGE (HTTP:/ /ELECTROSOME.COM/AUTHOR/LIJOPPANS/) / 2 COMMENT S

(HTTP:/ /ELECTROSOME.COM/SERVO-MOTOR-PIC-MPLAB-XC8/#DISQUS_THREAD)

Servo Motor is an ordinary geared dc motor 

equipped with closed loop servo mechanism

which uses position feedback to control exact

angular position of the rotor. These are

commonly used in robotic arms, legs etc. Servo

Motors do not rotate continuously, their rotation

is limited to fixed angles. Usually these motorshave rotation limit from 90º to 180° and some

special have limits 360° or more.

Servo Motors usually have three wires. RED

and BLACK wires are used to provide power.

Required voltage will depend upon the type of 

servo you are using, so please refer the

specifications given by the manufacture. The

third wire is used to provide control signals to control exact angular position of the servo

motor. Its color varies for different manufactures such as YELLOW, BROWN, WHITE etc.

Servo Motor shaft can be moved to desired position by using Pulse Width Modulated (

http://www.electrosome.com/pwm-pulse-width-modulation/) (PWM (

http://www.electrosome.com/pwm-pulse-width-modulation/)) signals on the control wire.

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Unlike DC Motors, reversing the power supply polarity does not reverse the rotation instead

of it may damage the control circuitry.

Servo Motors can be easily interfaced with PIC Microcontroller. Here for demonstration we

are using PIC 16F877A and VIGOR VS-10A servo motor. The required pulse width of this

servo motor ranges from 800μS to 2200μS and rotation angle is greater than or equal to

170°. Its operating voltage range is 4.8V to 6V.

(http://electrosome.com/wp-content/uploads/2012/06/Servo-Angular-Rotation-

Pulse-Width-Modulation1.jpg)

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Servo Angular Rotation Pulse Width Modulation ( http://electrosome.com/pwm-pulse-width-modulation/)

Circuit Diagram

(http://electrosome.com/wp-content/uploads/2014/08/Interfacing-Servo-Motor-with-PIC-

Microcontroller.jpg)

Interfacing Servo Motor with PIC Microcontroller (http://electrosome.com/servo-motor-pic-microcontroller/)

Tip :  Use separate power supplies for PIC and Servo Motor OR use proper filtering

capacitors otherwise ripples produced by the Servo Motor may affect the working of PIC.

MPLAB XC8 Code

#define _XTAL_FREQ 8000000

#include <xc.h>

// BEGIN CONFIG

#pragma config FOSC = HS

#pragma config WDTE = OFF

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#pragma config PWRTE = OFF

#pragma config BOREN = ON

#pragma config LVP = OFF

#pragma config CPD = OFF

#pragma config WRT = OFF

#pragma config CP = OFF

//END CONFIG

void servoRotate0() //0 Degree{

  unsigned int i;

  for(i=0;i<50;i++)

  {

  RB0 = 1;

  __delay_us(800);

  RB0 = 0;

  __delay_us(19200);

  }

}

void servoRotate90() //90 Degree

{

  unsigned int i;

  for(i=0;i<50;i++)

  {

  RB0 = 1;

  __delay_us(1500);

  RB0 = 0;

  __delay_us(18500);

  }}

void servoRotate180() //180 Degree

{

  unsigned int i;

  for(i=0;i<50;i++)

  {

  RB0 = 1;

  __delay_us(2200);

  RB0 = 0;

  __delay_us(17800);  }

}

void main()

{

  TRISB = 0; // PORTB as Ouput Port

  do

  {

  servoRotate0(); //0 Degree

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2 Comments

• •

Copper Masud  •  

MG996R

how can i drive this servo , pleasee ?? your code dont work with this one..

• •

Ligo George  •  Mod

use pulse width according to that servo specifications.

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