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

 modified on 8 Nov 2013
 by Scott Fitzgerald
 http://www.arduino.cc/en/Tutorial/Knob
*/

#include <Servo.h>

Servo myservo1;  // create servo object to control a servo
Servo myservo2;  // create servo object to control a servo
Servo myservo3;  // create servo object to control a servo
Servo myservo4;  // create servo object to control a servo


int potpin1 = A1;  // analog pin used to connect the potentiometer
int potpin2 = A2;  // analog pin used to connect the potentiometer
int potpin3 = A3;  // analog pin used to connect the potentiometer
int potpin4 = A4;  // analog pin used to connect the potentiometer
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
int val4;    // variable to read the value from the analog pin

void setup() {
  myservo1.attach(2);  // attaches the servo on pin 9 to the servo object
  myservo2.attach(3);  // attaches the servo on pin 9 to the servo object
  myservo3.attach(4);  // attaches the servo on pin 9 to the servo object
  myservo4.attach(5);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  val1 = analogRead(potpin1);            // reads the value of the potentiometer (value between 0 and 1023)
  val1 = map(val1, 0, 1023, 0, 180);     // scale it for use with the servo (value between 0 and 180)
  myservo1.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, 180);     // scale it for use with the servo (value between 0 and 180)
  myservo2.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, 180);     // scale it for use with the servo (value between 0 and 180)
  myservo3.write(val3);                  // sets the servo position according to the scaled value
  delay(15);                             // waits for the servo to get there

  val4 = analogRead(potpin4);            // reads the value of the potentiometer (value between 0 and 1023)
  val4 = map(val4, 0, 1023, 0, 180);     // scale it for use with the servo (value between 0 and 180)
  myservo4.write(val4);                  // sets the servo position according to the scaled value
  delay(15);                             // waits for the servo to get there
 
}