// Example code for controlling a servo
// First include the servo library, 
// this must be installed in the computer via Arduino IDE
#include <Servo.h>

// Define the pin that is used for sending data (i.e. the
// position) to the servo, and define a variable for the
// angle of the servo.
int servoPin = 8;
int servoAngle = 0;

// Declare a servo object. In this example it is called
// flagServo, but can be called anything
Servo flagServo;

void setup() {
  // Connect the servo object to the servo pin using attach
  flagServo.attach(servoPin);
  // Tell the servo to turn to the angle (servoAngle) using
  // write
  flagServo.write(servoAngle);
}

void loop() { 
  // Use a if statement to check the angle that is set for 
  // the servo, if it is 0 the new angle should be 90, if
  // it is 90 it should be 180, and if it is 180 it should
  // be 0.
  if (servoAngle == 0) {
    servoAngle = 90;
  } else if (servoAngle == 90) {
    servoAngle = 180;
  } else if (servoAngle == 180) {
    servoAngle = 0;
  }
  // Tell the servo to go to the new angle
  flagServo.write(servoAngle);
  // Wait one second before checking the new angle and
  // moving the servo again
  delay(1000);
}