#include <Servo.h>

Servo myServo;

void setup() {
  myServo.attach(PA0);
  }

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