// #include <Servo.h>

// Servo myservo;
// int servo_pin = 11;


// void setup() {
//   // put your setup code here, to run once:
//   myservo.attach(servo_pin);
// }

// void loop() {
//   // put your main code here, to run repeatedly:
//   myservo.write(0);
//   delay(2000);
//   myservo.write(90);
//   delay(2000);
//     myservo.write(180);
//   delay(2000);

// }
#include <Servo.h>

Servo myservo;
int servo_pin = 11;


void setup() {
  // put your setup code here, to run once:
  myservo.attach(servo_pin);
}

void loop() {
  // put your main code here, to run repeatedly:
int pos = 0;
int dtwait = 30;
for(pos = 0; pos <= 180; pos++){
  myservo.write(pos);
  delay(dtwait);
}
for(pos = 180; pos <= 0; pos++){
  myservo.write(pos);
  delay(dtwait);
}

}