int greenled = D0;
int whiteled = D6;
int orangeled = D7;

int brightness = 0;        // how bright the LEDs are
int fadeAmount = 5;        // how many points to fade the LEDs by

int potentiometerPin = A2; // the analog pin the potentiometer is attached to
int potValue = 0;

void setup() {
  pinMode(greenled, OUTPUT);
  pinMode(whiteled, OUTPUT);
  pinMode(orangeled, OUTPUT);
}

void loop() {
  // read the value from the potentiometer:
  potValue = analogRead(potentiometerPin);

  // map the potentiometer value to a brightness value between 0 and 255:
  brightness = map(potValue, 0, 1023, 0, 255);

  // set the brightness of each LED:
  analogWrite(greenled, brightness);
  analogWrite(whiteled, brightness);
  analogWrite(orangeled, brightness);

  // wait for a short time to see the effect:
  delay(30);
}