two Servos running in opposite directions from one potiometer

Projects General Guidance
1

I would like to use the potentiometer to control two servos moving opposite direction at the same speed. The reason is, I want to connect two servos to the same robot arm and thus would have to move opposite directions

is this possible to do on an arduino board??

i have seen how to use one servo on the servo knob example but cant figure out how to make it work for what i am trying to do

2

I have never used a servo (yet), but of course this is possible. The Arduino and your sketch sits in-between the pot and the servo... It's up to your sketch to control the servo... You could run the servo totally under software control with no pot at all!

3

Well if one of the Servos moves at degrees, the other one moves opposite at <180-val> degrees...

4

Simple test code for making reverse operating servos.

//zoomkat 10-09-14 serial servo test
//type servo position 0 to 180 in serial monitor
//opposite side servos rotate together

String readString;
#include <Servo.h> 
Servo myservo1;  // create servo object to control a servo 
Servo myservo2;

void setup() {
  Serial.begin(9600);
  myservo1.attach(8);
  myservo2.attach(9);
  Serial.println("servo-test"); // so I can keep track of what is loaded
}

void loop() {

  while (Serial.available()) {
    char c = Serial.read();  //gets one byte from serial buffer
    readString += c; //makes the String readString
    delay(2);  //slow looping to allow buffer to fill with next character
  }

  if (readString.length() >0) {
    Serial.println(readString);  //so you can see the captured String 
    int n = readString.toInt();  //convert readString into a number
    myservo1.write(n);
    myservo2.write(180-n); //turns opposide servo in desired direction
    readString="";
  } 
}
5

You could also reverse the servo.
Swap the motor leads over and also the 2 wires on the outside terminals of the feedback pot.