// a sketch to read the light sensor directly wired into the arduino

#include <Servo.h>  // include the library necessary to run the servo

Servo myservo;  // create a servo object
int pos = 0;    // initialise the position to zero

int lightPin = A0;  // set the analog input pin for the light sensor
int lightLevel;     // a variable to store the light level measurement
#define lightCritical 1000  // a level that worked this evening. Will need later adjustment

void setup() {
  myservo.attach(9);  // set up communication with the servo on Pin 9
  pinMode(13,OUTPUT); // set up the onboard LED to provide some visual feedback
  Serial.begin(9600); // set up a light level monitor to allow lightCritical to be tuned
  
}

void loop() {

  lightLevel = analogRead(lightPin);  // read the light sensor
  Serial.println(lightLevel);         // output to computer
  
  if (lightLevel > lightCritical) {
      digitalWrite(13,HIGH);          // turn on LED
      myservo.write(90);              // rotate servo 90 degrees
      delay(100);                     // wait for servo to reach max angle
    } else {
      digitalWrite(13,LOW);           // turn off LED
      myservo.write(0);               // rotate servo to zero
      delay(100);                     // wait for servo to reach zero
  }
}