/*
  Continuous servo.
  myservo.write(0);   // full-speed counter-clockwise
  myservo.write(90);  // stop - approximate, adjust for servo
  myservo.write(180); // full-speed clockwise
*/

#include <Servo.h> // servo library
Servo myservo; // create servo object
byte servoPin = 9; // servo signal pin

byte maxCCW = 0, stop = 90, maxCW = 180; // angle definitions
int wait = 20;

#define horz A0
#define vert A1
#define sel   2

void setup() {
  Serial.begin(115200); // start serial communication
  myservo.attach(servoPin); // attach servo to object
  myservo.write(stop); // stop the motor
}

void loop() {
  joysticksweep();
  // autosweep();
}

void joysticksweep() {
  int MAXCCW =   0; // adjust between 90 (STOP) and   0 (fastest CCW)
  int MAXCW  = 180; // adjust between 90 (STOP) and 180 (fastest CW)
  int val = map(analogRead(horz), 0, 1023, MAXCW, MAXCCW);
  myservo.write(val);
}

void autosweep() {
  sweep(stop, maxCW); // increase CW speed from stop to max
  sweep(maxCW, stop); // decrease CW speed from max to stop
  sweep(stop, maxCCW); // increase CCW speed from stop to max
  sweep(maxCCW, stop); // decrease CCW speed from max to stop
}

void sweep(int a, int b) { // get start and end angle values
  if (a < b) {
    for (int i = a; i < b; i++) {
      myservo.write(i);
      delay(wait);
    }
  } else {
    for (int i = a; i > b; i--) {
      myservo.write(i);
      delay(wait);
    }
  }
}