int Sensor_LDR;
int Pin_LDR = A0;
int led=3;

void setup() {
pinMode(led, OUTPUT);
pinMode(Pin_LDR, INPUT);
}

void loop() {
  Sensor_LDR =map(analogRead(Pin_LDR),0,1023,1,10);

if (Sensor_LDR == 1) {
analogWrite(led, 0);
}
if (Sensor_LDR == 2) {
analogWrite(led, 25);
}
if (Sensor_LDR == 3) {
analogWrite(led, 50);
}
if (Sensor_LDR == 4) {
analogWrite(led, 75);
}
if (Sensor_LDR == 5) {
analogWrite(led, 100);
}
if (Sensor_LDR == 6) {
analogWrite(led, 125);
}
if (Sensor_LDR == 7) {
analogWrite(led, 150);
}
if (Sensor_LDR == 8) {
analogWrite(led, 175);
}
if (Sensor_LDR == 9) {
analogWrite(led, 200);
}
if (Sensor_LDR == 10) {
analogWrite(led, 225);
}
}