// Controlling a servo position using a potentiometer (variable resistor) 
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott> 

#include <Servo.h> 
 
Servo a;  // create servo object to control a servo
Servo b;  // create servo object to control a servo
Servo c;  // create servo object to control a servo
Servo d;  // create servo object to control a servo

 
int potpin0 = 0;  // analog pin used to connect the potentiometer
int potpin1 = 1;  // analog pin used to connect the potentiometer
int potpin2 = 2;  // analog pin used to connect the potentiometer
int potpin3 = 3;  // analog pin used to connect the potentiometer

int val0;    // variable to read the value from the analog pin 
int val1;    // variable to read the value from the analog pin 
int val2;    // variable to read the value from the analog pin 
int val3;    // variable to read the value from the analog pin 
 
 
void setup() 
{ 
  a.attach(0);  // attaches the servo on pin 0 to the servo object
  b.attach(1);  // attaches the servo on pin 1 to the servo object
  c.attach(2);  // attaches the servo on pin 2 to the servo object
  d.attach(3);  // attaches the servo on pin 3 to the servo object
} 
 
void loop() 
{ 
  val0 = analogRead(potpin0);            // reads the value of the potentiometer (value between 0 and 1023) 
  val0 = map(val0, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  a.write(val0);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 
  
  val1 = analogRead(potpin1);            // reads the value of the potentiometer (value between 0 and 1023) 
  val1 = map(val1, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  b.write(val1);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 
  
  
  val2 = analogRead(potpin2);            // reads the value of the potentiometer (value between 0 and 1023) 
  val2 = map(val2, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  c.write(val2);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 
  
  val3 = analogRead(potpin3);            // reads the value of the potentiometer (value between 0 and 1023) 
  val3 = map(val3, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  d.write(val3);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 
  
   
  
}