// LDR connected to A0
// LED connected to PWM pin 9

void setup() {
  Serial.begin(9600);
}

void loop() {
  int ldrValue = analogRead(A0);
  int ledBrightness = map(ldrValue, 0, 1023, 0, 255);
  analogWrite(9, ledBrightness);
  Serial.println(ldrValue);
  delay(100); // Read every 100ms
}