HOW TO CONVERT DC MOTOR INTO SERVO MOTOR

Working with servos is a bit costly so i all ways think about conversion of a ordinary DC motor into a servo motor.in a servo motor it consists of a rotatory encoder connected to the shaft of motor for position feed backall optical rotatory encoder are a bit costly. in my looo.....ong search of a cheep encoder i found one

guess what??????????????????????

                                                   POTENTIOMETER(POT) 

all of us familiar with this potentiometer.which act as a potential divider between three points.

it consists of three pins.the resistance between pins 1 and 3 is constant. but if we rotate the shaft then resistance between (1,2) or (2,3) varies.the center pin some times referred as wiper.    

   MAKING:

  take a10k pot and solder three wires to it as shown in the picture 

BLACK== GND, BROWN == O/P, RED==Vcc

FOLLOW THE IMAGES

OVER ALL BLOCK DIAGRAM

PSEUDO CODE LOGIC:

main()
{
   config adc;

  config motor control pins;
 
   while(1)
  {
     read adc of control pot;
    read adc of motor pot;
    if(motor adc > control adc)
       motor forward;                            // could also be back ward
     else if( motor adc < control adc)  //the idea is to turn motor in direction than neutralizes                           motor back ward ;                    //error  between motor pot value and control pot value
     else
       motor stop;      // if no error motor stop
   }

}