int ldrPin = A0;
int ledPin = 9;

void setup() {
  Serial.begin(96000);
  pinMode(ledPin, OUTPUT);
}

void loop() {

  int ldrValue = analogRead(ldrPin);

  Serial.print("LDR Value: ");
  Serial.println(ldrValue);

  // PWM brightness control
  int brightness = map(ldrValue, 0, 1023, 255, 0);

  analogWrite(ledPin, brightness);

  delay(500);
}