#define sensorPin 0
#define lightPin 5

void setup() {
  // put your setup code here, to run once:
  pinMode(lightPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  // larger is darker. 853 is twilight
  int newBrightness = analogRead(sensorPin);
  newBrightness = map(newBrightness, 0, 1023, 0, 255);
  analogWrite(lightPin, newBrightness);
  delay(100);
}