void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(A0, INPUT);
}
void loop() {
  int light_intensity=analogRead(A0);
  Serial.println(light_intensity);
  // put your main code here, to run repeatedly:
switch(light_intensity){
  case 0 ... 200:
    Serial.println("dark");
    break;
  case 201 ... 500:
    Serial.println("dim");
    break;
  case 501 ... 800:
    Serial.println("medium");
    break;
  case 801 ... 1000:
    Serial.println("bright");
    break;
      }
  delay(500);

}