// Controlling a servo position using a potentiometer (variable resistor) 
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott> 
// Added a second servo moving in the other direction
// by Markus Jabs <http://markus.jabs.name>

#include <Servo.h> 
 
Servo myservo_1;  // create servo object 1 to control servo 1
Servo myservo_2;  // create servo object 2 to control servo 2
 
int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin 
int val_1;    // variable to to send to the servo_pin 1
int val_2;    // variable to to send to the servo_pin 2
 
void setup() 
{ 
  myservo_1.attach(9);  // attaches the servo 1 on pin 9 to the servo object 
  myservo_2.attach(10);  // attaches the servo 2 on pin 10 to the servo object 
} 
 
void loop() 
{ 
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023) 
  val_1 = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo 1 (value between 0 and 180) 
  val_2 = map(val, 0, 1023, 179, 0);     // scale it backwards to use it with the servo 2 (value between 180 and 0) 
  myservo_1.write(val_1);                  // sets the servo position according to the scaled value 
  myservo_2.write(val_2);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 
}