#include <Servo.h>
int spin=6;
Servo myservo; 

void setup() {
myservo.attach(spin);
Serial.begin(115200);
myservo.write(0);
}

void loop() {
for (int i=0; i<=90; i++){
  myservo.write(i);
  delay(200);
}
delay(1000);
for (int in=90; in>=0; in--){
  myservo.write(in);
  delay(200);
}
delay(1000);
}