int photoRPin = 0; 

int minLight;          

int maxLight;        

int lightLevel;

int adjustedLightLevel;



void setup() {

 Serial.begin(9600);

 

 lightLevel=analogRead(photoRPin);

 minLight=lightLevel-20;

 maxLight=lightLevel;

}



void loop(){

 lightLevel=analogRead(photoRPin);

 if(minLight>lightLevel){

 minLight=lightLevel;

 }

 if(maxLight<lightLevel){

 maxLight=lightLevel;

 }

 

 adjustedLightLevel = map(lightLevel, minLight, maxLight, 0, 100); 

 

 Serial.println(adjustedLightLevel);

 

 delay(50);

}