#include <Servo.h>

#define PWM_PIN 11

Servo pwm;



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

void loop() {
  // put your main code here, to run repeatedly:

pwm.write(0);
delay(1000);
pwm.write(180);
delay(1000);

}