void setup() 
{
pinMode(9,OUTPUT);
Serial.begin(9600);
}

void loop() 
{
int ldr=analogRead(A0);
int y = map(ldr,0,1023,0,255);
if(y == 1){
  analogWrite(9,0);
}
else{
  analogWrite(9,y);
}
Serial.println(y);

}