#include <Servo.h>

Servo myServo;            //name servo
int photocellPin = 0;     //define photo cell reading input
int photocellReading;     //define photo cell reading variable

void setup()
{
  Serial.begin(9600);     //initiate serial @ 9600 baud
  myServo.attach(11);     //define pin 11 as servo signal pin
}
void loop()
{
  Serial.print("Brightness = ");                //print "Brightness = "
  Serial.println(photocellReading);             //print the photocell reading
  photocellReading = analogRead(photocellPin);                    //define photocellReading as pin 0 input from LDR
  photocellReading = map(photocellReading, 0, 1023, 0, 179);      //map the LDR input to a value between 1-180 so the servo can understand it
{
  if (photocellReading <= 70){                    //if the LDR is showing darkness
    myServo.write(20);                          //then tell the servo to rotate forwards at a steady rate (close shade)
      delay(2500);                               //2.5 second delay while shade is closing?
      myServo.write(20);
      } //stop rotation after dalay
  else if (photocellReading >= 110){              //if the LDR is showing light
    myServo.write(180);                           //then tell the servo to rotate backwards at a steady rate (open shade)
      delay(2500);                               //2.5 second delay while shade is opening?
      myServo.write(180);            
     }             //stop rotation after dalay
  else(photocellReading >= 71 && photocellReading <= 109);
    myServo.write(90);
  delay(15);
}
}