/*www.theorycircuit.com*/
int ledPin = 3;
int photocell = 0;
 
void setup()  {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}
 
 
void loop()  {
 
  photocell = (analogRead(0)/4); // Divides input 0-1023 to resemble to 0-255
 
  analogWrite(ledPin, photocell);
  Serial.print(photocell);  
                                      // The delay can be change to get the desired dimming effect
  delay(20);                            
}