Code for testing your light sensor

testLightSensor.ino

int ledPins[] = { 
  11, 10, 9, 6, 5, 3 }; 
int pinCount = 6;        

int lightPin = A0;    // A variable for which pin has the light sensor.
int lightValue = 0;    // A variable to keep track of the value we get from the light sensor.

int aLED = 13;        
boolean aLEDstate;   

void setup() {
  Serial.begin(9600);
  pinMode(aLED, OUTPUT);
  for (int thisPin = 0; thisPin < pinCount; thisPin++)  {
    pinMode(ledPins[thisPin], OUTPUT);    
  }
  startUp(); //I put the LED test into a function that runs every time the Arduino starts up.
}

//===============LOOP================//

void loop() {  
  lightValue = analogRead(lightPin); //Read the light sensor and store the value.
  monitor(); 
}

//==============ENDLOOP==============//

void startUp() { //This code will run once at start up.
  for (int thisPin = 0; thisPin < pinCount; thisPin++) { 
    digitalWrite(ledPins[thisPin], HIGH);   
    delay(30);              
    digitalWrite(ledPins[thisPin], LOW);    
  }
  for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { 
    digitalWrite(ledPins[thisPin], HIGH);
    delay(30);
    digitalWrite(ledPins[thisPin], LOW);
  }
}

void monitor() { //This code will run at the bottom of every loop.
  Serial.print("light = ");
  Serial.println(lightValue);
  digitalWrite(aLED, aLEDstate); 
  aLEDstate = !aLEDstate;    
}