/*#define D 400*/

void readDelay(unsigned int*);
void switchOff(void);
void switchon(byte);


void setup() {
  pinMode(0, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);

  digitalWrite(0, LOW);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
}


unsigned int D;

void loop() {
  readDelay(&D);  

  /* clear */
  switchOff();
  delay(D);

  readDelay(&D);
  /* sequence */
  switchOn(0);
  delay(D);
  switchOn(1);
  delay(D);
  switchOn(2);
  delay(D);

  readDelay(&D);
  /* All On */
  switchOff();
  delay(D);
  digitalWrite(0, HIGH);
  digitalWrite(1, HIGH);
  digitalWrite(2, HIGH);
  delay(D);

  readDelay(&D);
  /* sequence back */
  switchOff();
  delay(D);
  switchOn(2);
  delay(D);
  switchOn(1);
  delay(D);
  switchOn(0);
  delay(D);
}


void readDelay(unsigned int *del)
{
  *del = map(analogRead(A3), 0, 1023, 50, 800);
}

void switchOff(void)
{
  digitalWrite(0, LOW);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
}



void switchOn(byte n)
{
  switchOff();
  digitalWrite(n, HIGH);
}