#include <Servo.h> 

int servoPin = A1;
Servo Servo1;

void setup() {
  Servo1.attach(servoPin);
}

void loop(){
  Servo1.write(0);
  delay(1000);
  Servo1.write(90);
  delay(1000);
  Servo1.write(180);
  delay(1000);
}