Photoresistor 1

const int PhotoR = A0;
const int LEDpin = 5;
int ReadValue = 0;

void setup()
{
  pinMode (PhotoR, INPUT);
  pinMode (LEDpin, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  ReadValue = analogRead(PhotoR);
  ReadValue = map(ReadValue, 13, 493, 255, 0);
  ReadValue = constrain(ReadValue, 0, 255);
  Serial.println(ReadValue);
  analogWrite(LEDpin, ReadValue);
}