#include <Servo.h>
                                
                                Servo myservo1;  // create servo object to control a servo
                                Servo myservo2;  // create servo object to control a servo
                                
                                int pot_1_pin = A0;  // analog pin used to connect the potentiometer
                                int pot_2_pin = A1;  // analog pin used to connect the potentiometer
                                int val_1;    // variable to read the value from the analog pin
                                int val_2;    // variable to read the value from the analog pin
                                int past_1 = 0;
                                int past_2 = 0;
                                
                                void setup() {
                                  Serial.begin(115200);
                                  pinMode(5, OUTPUT);
                                  myservo1.attach(10);  // attaches the servo on pin 9 to the servo object
                                  myservo2.attach(11);  // attaches the servo on pin 9 to the servo object
                                }
                                
                                void loop() {
                                  val_1 = analogRead(pot_1_pin);            // reads the value of the potentiometer (value between 0 and 1023)
                                  val_1 = map(val_1, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
                                  val_2 = analogRead(pot_2_pin);            // reads the value of the potentiometer (value between 0 and 1023)
                                  val_2 = map(val_2, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
                                  myservo1.write(val_1);                  // sets the servo position according to the scaled value
                                  myservo2.write(val_2);                  // sets the servo position according to the scaled value
                                  Serial.print(val_1);
                                  Serial.print("    ");
                                  Serial.println(val_2);
                                  delay(15);                           // waits for the servo to get there
                                  if ((val_1 != past_1) || (val_2 != past_2)) {
                                    digitalWrite(5, HIGH);
                                  }
                                  else {
                                    digitalWrite(5, LOW);
                                  }
                                  past_1 = val_1;
                                  past_2 = val_2;
                                }