Analog sensor

const int LedPinRed =11;
const int LedPinGreen=10;
const int LedPinBlue =9;
const int LedPinRed2 = 6;
const int PhotoPin = A0;
int ReadValue;
int counter = 0;

void setup()

{
  pinMode (LedPinRed, OUTPUT);
  pinMode (LedPinGreen, OUTPUT);
  pinMode (LedPinBlue, OUTPUT);
  pinMode (LedPinRed2, OUTPUT);
  pinMode (PhotoPin, INPUT);
  Serial.begin (9600);
}

void loop ()

{
ReadValue = analogRead (PhotoPin);
Serial.println (ReadValue);
ReadValue=map (ReadValue, 581, 900, 255, 0);
ReadValue=constrain(ReadValue, 0, 255);
analogWrite (LedPinRed, ReadValue);
analogWrite (LedPinGreen, ReadValue);
analogWrite (LedPinBlue, ReadValue);
analogWrite (LedPinRed2, ReadValue);
}