int LDRPin = A0;       
int ledPin = 9;
int sensorValue = 0;   
int ledBrightness = 0; 

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600); 
}

void loop() {
  sensorValue = analogRead(LDRPin); 
  ledBrightness = map(sensorValue, 0, 1023, 255, 0);
  analogWrite(ledPin, ledBrightness); 
  Serial.print("LDR value: ");
  Serial.print(sensorValue);
  Serial.print(" LED brightness: ");
  Serial.println(ledBrightness);
  delay(100); 
}