int tombol_atas = 12;
int tombol_bawah = 14;

bool val_at = true;
bool val_bw = true;

int sud = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("Start");
  pinMode(tombol_atas, INPUT_PULLUP);
  pinMode(tombol_bawah, INPUT_PULLUP);
  
}

void loop() {
  val_at = digitalRead(tombol_atas);
  val_bw = digitalRead(tombol_bawah);
  Serial.print(val_at);
  Serial.print(", ");
  Serial.print(val_bw);
  Serial.print(" | ");

  if ( val_at == false){
    ++sud;
    if(sud > 180){ sud = 180;}
  }
  else if(val_bw == false){
    --sud;
    if(sud < 0){ sud = 0;}
  }
  Serial.println(sud);
  delay(100);
}