#include <Servo.h>

Servo servoM;

int pos=0;



  
void setup()
{
  servoM.attach(9);
  
}

void loop()
{
  for(pos=0;pos<=180;pos += 1)
  {
    servoM.write(pos);
    delay(15);
    
  }
  for(pos=180;pos>=0;pos -=1)
  {
    servoM.write(pos);
    delay(15);
  }
}