Led dimmer by using Potentiometer

Here's my codes,

const int LedPin = 3;
const int PotPin = 0;
static int val=0;

void setup() {
  pinMode(LedPin, OUTPUT);
}

void loop() {
  val = analogRead(PotPin);
  LedTune();

  analogWrite(LedPin, val);
}

void LedTune(){
  val = map(val, 0, 1023, 0, 255);
  val = constrain(val, 0, 255);
}

Photoresistor, Arduino circuit.

Changing the light intensity of an LED by using a photo resistor.

And here's my codes,


const int PhotoPinNo = 0;
const int LedPinNo = 3;
int val;

void setup() {
  pinMode(LedPinNo, OUTPUT);
}

void loop()
{
  val = analogRead(PhotoPinNo);

  BrightTune();

  analogWrite(LedPinNo, val);
}

void BrightTune()
{
  val = map(val, 450, 850, 255, 0);
  val = constrain(val, 0, 255);