Photoresistor

const int photo_resist=A1;
int PhotoVal;
const int PinLed1 = 5;
const int PinLed2 = 6;
const int PinLed3 = 9;

void setup() {

  // put your setup code here, to run once:
Serial.begin(9600);
pinMode (photo_resist, INPUT);
pinMode(PinLed1, OUTPUT);
pinMode(PinLed2, OUTPUT);
pinMode(PinLed3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
PhotoVal = analogRead(photo_resist);
Serial.println(PhotoVal);
PhotoVal = map(PhotoVal, 300,500,255,0);
analogWrite(PinLed1, PhotoVal);
analogWrite(PinLed2, PhotoVal);
analogWrite(PinLed3, PhotoVal);
}