#include <Servo.h>
Servo s1;
double pos = 0.0;
double poschange = 0.5;
int led = 13;
void setup() 
{
pinMode(led, OUTPUT);
s1.attach(11);
}
void loop()
{
digitalWrite(led, HIGH);
for(int l = 0; l < 360; l++)
{
 s1.write(pos);
 pos = pos + poschange;
 delay(120000);
 if(pos >= 180)
 {
  break;
 }
}
digitalWrite(led, LOW);
for(int l = 360; l > 0; l--)
{
 s1.write(pos);
 pos = pos - poschange;
 delay(120000);
  if(pos <= 180)
 {
  break;
 }
}
}