#include <Servo.h>

#define LASER 7
#define SERVO 6

#define SERVO_LEFT 150
#define SERVO_RIGHT 30
#define SERVO_TIME 1200

Servo servo;

//====================================================
void servo_throw(bool left_to_right)
{
  digitalWrite(LASER, HIGH);
  delay(200);
  servo.write(left_to_right ? SERVO_RIGHT : SERVO_LEFT);
  delay(200);
  digitalWrite(LASER, LOW);
}
//====================================================
void setup() 
{
  pinMode(LASER, OUTPUT);
  servo.attach(SERVO);
  servo.write(SERVO_LEFT);
}
//====================================================
void loop() 
{
  delay(1000);
  servo_throw(true);
  delay(1000);
  servo_throw(false);
}