//                //
// D5 --/\/\/\---|>|--GND
//
//       100k   47uF
// D2 --/\/\/\---||---GND
//       100k   47uF
// D3 --/\/\/\---||---GND

int brightness;
void setup() {
  // put your setup code here, to run once:
  if(digitalRead(2)) {
    if(digitalRead(3)) {
      brightness = 5;
    } else {
      brightness = 40;
      pinMode(3, OUTPUT);
      digitalWrite(3, HIGH);
    }
  } else {
    pinMode(2, OUTPUT);
    digitalWrite(2, HIGH);
    brightness = 255;
  }
  pinMode(5, OUTPUT);
  analogWrite(5, brightness);
}

void loop() {

}