UpDowner.ino

#define T 30

#define PIN_START 3
#define PIN_TOP 4
#define PIN_BOT 5
#define PIN_DOWN 7
#define PIN_UP 9

void setup() {
  pinMode(PIN_START, INPUT);
  pinMode(PIN_TOP, INPUT);
  pinMode(PIN_BOT, INPUT);
  pinMode(PIN_DOWN, OUTPUT);
  pinMode(PIN_UP, OUTPUT);
  goNo();
}

void loop() {
  if(digitalRead(PIN_START) == LOW)
    return;
  goDown();//start going down
  while(digitalRead(PIN_BOT) == LOW);//untill we hit rock bottom
  goNo();//then stop
  delay(T * 1000);//then wait T seconds
  goUp();//start going up
  while(digitalRead(PIN_TOP) == LOW);//untill we hit sky top
  goNo();//and stop
}

void goDown() {
  digitalWrite(PIN_UP, LOW);
  digitalWrite(PIN_DOWN, HIGH);
}

void goUp() {
  digitalWrite(PIN_DOWN, LOW);
  digitalWrite(PIN_UP, HIGH);
}

void goNo() {
  digitalWrite(PIN_DOWN, LOW);
  digitalWrite(PIN_UP, LOW);
}