// Sweep
// by BARRAGAN <http://barraganstudio.com> 
// This example code is in the public domain.


#include <Servo.h> 
 
Servo myservo;  // create servo object to control a servo 
                // a maximum of eight servo objects can be created 
 
int pos = 0;    // variable to store the servo position 
int startlight = 0 ;
int startaccel = 0 ;
int lightthreshold = 20 ; 
int accelthreshold = 3 ;
int newlight = 0 ;
int newaccel = 0 ;
 
 
void setup() 
{ 
  delay(200) ;
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
  startlight = analogRead(A0) ;
  startaccel = analogRead(A5) ;
  Serial.begin(9600) ;
} 
 
 
void loop() 
{ 
  delay(5) ;
  newlight = analogRead(A0) ;
  newaccel = analogRead(A5) ;
  Serial.print(startlight) ;
  Serial.print(", ") ;
  Serial.print( newlight) ;
  Serial.print( ".   ") ;
  Serial.print(startaccel) ;
  Serial.print(", ") ;
  Serial.println(newaccel) ;
  if ( ( abs (startlight - newlight) > lightthreshold)  || (abs (startaccel - newaccel) > accelthreshold) )
 { 

    for(pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees 
    {                                  // in steps of 1 degree 
      myservo.write(pos);              // tell servo to go to position in variable 'pos' 
      delay(5);                       // waits 15ms for the servo to reach the position 
    } 
    for(pos = 180; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees 
    {                                
      myservo.write(pos);              // tell servo to go to position in variable 'pos' 
      delay(5);                       // waits 15ms for the servo to reach the position 
    }  
    delay(200);
  
 }
 
 
 
}