Interfacing Servo Motor With PIC Microcontroller - MPLAB XC8

11/12/2014

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Interfacing Servo Motor with PIC Microcontroller - MPLAB XC8

Interfacing Servo Motor with PIC Microcontroller – MPLAB XC8 B Y L I G O G E O RG E (HTTP : / / E L E CTRO S O ME . CO M/ A UTHO R/ L I J O P P A NS / ) / 2 CO MME NTS (HTTP : / / E L E CTRO S O ME . CO M/ S E RV O -MO TO R-P I C-MP L A B -X C8 / # DI S Q US _ THRE A D)

Keep Your Cloud Private All of Our Servers Are the Most Secure & Powerful. Chat to Save! 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 motors have 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.

(http://electrosome.com/wpRequired voltage will depend upon the type of content/uploads/2012/06/Servo-Motor.gif) servo you are using, so please refer the specifications given by the manufacture. The

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

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.

http://electrosome.com/servo-motor-pic-mplab-xc8/

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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.

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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-RotationPulse-Width-Modulation1.jpg) http://electrosome.com/servo-motor-pic-mplab-xc8/

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

Circuit Diagram

(http://electrosome.com) (http://electrosome.com/cart/)

(http://electrosome.com/wp-content/uploads/2014/08/Interfacing-Servo-Motor-with-PICMicrocontroller.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 // BEGIN CONFIG #pragma config FOSC = HS #pragma config WDTE = OFF http://electrosome.com/servo-motor-pic-mplab-xc8/

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#pragma config #pragma config #pragma config #pragma config #pragma config #pragma config //END CONFIG


PWRTE = OFF BOREN = ON LVP = OFF CPD = OFF WRT = OFF CP = OFF

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 http://electrosome.com/servo-motor-pic-mplab-xc8/

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__delay_ms(2000); servoRotate90(); //90 Degree __delay_ms(2000); servoRotate180(); //180 Degree }while(1); }

Hope you can understand the working of the above program. If you have any doubts just comment below.

Download You can download the entire project files here. Servo Motor (http://electrosome.com/wp-content/uploads/2014/08/Servo-Motor.zip)

Want to See the Output ?


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2 Comments

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Join the discussion… Copper Masud

•

a month ago

MG996R how can i drive this servo , pleasee ?? your code dont work with this one..

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Ligo George

Mod

> Copper Masud • a month ago

use pulse width according to that servo specifications.

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Interfacing Servo Motor With PIC Microcontroller - MPLAB XC8

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