#include <Servo.h>
Servo servo1;

void setup() {

  servo1.attach(11);
  // put your setup code here, to run once:
  pinMode(12,OUTPUT);
  pinMode(11,OUTPUT);
  

}

void loop() {

      // THIS IS A BASIC RANDOM ANGLE 
      int angle1 = random( 0, 181);    // 0...180
      //servo1.write(angle1); // THIS IS HOW YOU CHANGE THE ANGLE MANUALLY 
      delay(1000); 
    
    // THIS IS A SINUSOIDAL MOVEMENT OF THE MOTOR
    float s = sin(angle1);               // The sine from the angle in radian
    float t = (90.0 * s) + 90.0;     // convert -1...1 to 0...180
    int angle2 = int( t);            // convert it to integer for the servo angle
    servo1.write( angle2);

    int potentiometer1 = analogRead( A0);
    float r_increment = 0.001 + (0.00005 * float(potentiometer1));

    angle1 += r_increment;
    if( angle1 >= 2.0 * M_PI)
    {
      angle1 -= 2.0 * M_PI;
    }

}