#define led 3
#define photo A0

int val;
int val1;
void setup(){
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}
void loop(){
  val = analogRead(photo);
  val1 = map(val, 0, 200, 0, 255);
  Serial.println(val);
  Serial.println(val1);
  analogWrite(led,val1);
}