#include <Servo.h>
Servo myServo;



void setup() {
    myServo.attach(A0);
}

void loop() {
    // stop rotation
    myServo.write(1000);
    myServo.write(90);
    delay (1000);
    myServo.write(180);
    delay (1000);
    myServo.write(0);
    delay(1000)

    // alternate code (use either one but not both)
    // servo.write(90);