Help getting values of potentiometer

Hi

I'm building a 2dof flight simulator and i have my arduino sketch that gets the position of the aircratf and maps it to the position of a small servo but now i want to do it with a wiper motor building the DIY Linear Actuators (http://bffsimulation.com/linear-act.php) How can i get the value of the position of and map it to my sketch?

here is part of the code:

// Roll
if (discard == 'R'){ // Found the reading "Roll"
delay (5); // It seems to need a delay here
roll = "";
roll += char(Serial.read()); // first digit pof the data
roll += char(Serial.read()); // Second digit and so-on
roll += char(Serial.read());
roll += char(Serial.read());
roll += char(Serial.read());
roll += char(Serial.read());
if (roll != rollold){ // checks to see if its different to the "old" reading
char carray[7]; //converting a string to number sequence
roll.toCharArray(carray, sizeof(carray)); //converting string to number sequence
int n = atoi(carray); //converting string to number sequence

// maybe the potentiometer value goes here and them map it to the servo

n = map(n, -90, 90, 0, 179); //Maps the readings to the servo
myservoroll.write(n); //Sends the data to servo
rollold = roll; // Writes the current reading to the "old" string.
} // end of it's a different reading section
}

any help will be very appreciated

Help It dépends on what DC driver you intend to use: pwm+1 pin direction
Or 2 pins direction ?...
Then you have to change the code accordingly.

Have a look at my Resources (link below)
Mat

Firstly, you have to implement the POT in such a way that it can read the entire mechanical range of your actuator design. This can be done with the help of gears or multi turn pots. Sketch for servo motors are entirely different and cannot be used. You should be able to use racing mat 2dof sketch as its written for wiper + pot setup.