#define pinGroup1               2
#define pinGroup2               3
#define pinGroup3               4
#define pinGroup4               5
 
#define pinGroup1Indikator      A0
#define pinGroup2Indikator      A1
#define pinGroup3Indikator      A2
#define pinGroup4Indikator      A3
 
#define pinReset                8
#define pinBel                  9
 
#define relayAktif              LOW
#define jumlahGroup             4
#define waktuBel                3000
 
byte pinGroup[jumlahGroup] = {pinGroup1, pinGroup2, pinGroup3, pinGroup4};
byte pinGroupIndikator[jumlahGroup] = {pinGroup1Indikator, pinGroup2Indikator, pinGroup3Indikator, pinGroup4Indikator};
 
byte groupAktif;
byte groupScan;
byte tombolAktif;
long millisBel;
bool statusTombol;
bool statusSesi;
bool sesi[jumlahGroup];
 
// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(9600);
  Serial.println(F("Tombol cerdas cermat berbasis arduino"));
  Serial.println(F("https://www.semesin.com/project"));
  Serial.println();
 
  for (int i = 0; i < sizeof(pinGroup); i++)
  {
    pinMode(pinGroup[i], INPUT_PULLUP);
    pinMode(pinGroupIndikator[i], OUTPUT);
  }
 
  pinMode(pinReset, INPUT_PULLUP);
 
  digitalWrite(pinBel, !relayAktif);
  pinMode(pinBel, OUTPUT);
 
  memset(sesi, 1, 4);
}
 
// the loop routine runs over and over again forever:
void loop() {
 
  groupScan = (groupScan + 1) % jumlahGroup;
  if (!digitalRead(pinGroup[groupScan]))
  {
    if (tombolAktif)
    {
      if (sesi[groupScan])
      {
        groupAktif = groupScan + 1;
        statusTombol = true;
        statusSesi = true;
      }
    }
    else if (!statusSesi)
    {
      if (sesi[groupScan])
      {
        sesi[groupScan] = false;
        Serial.print("Diskualifikasi : ");
        Serial.println(groupScan + 1);
      }
    }
  }
 
  if (!digitalRead(pinReset))
  {
    delay(50);
 
    if (!digitalRead(pinReset))
    {
      tombolAktif = false;
      if (groupAktif)
      {
        digitalWrite(pinGroupIndikator[groupAktif - 1], LOW);
        digitalWrite(pinBel, !relayAktif);
        groupAktif = 0;
        Serial.println("Reset");
        statusSesi = false;
        memset(sesi, 1, 4);
      }
    }
  }
  else if (groupAktif)
  {
    if (statusTombol)
    {
      Serial.print("Group : ");
      Serial.println(groupAktif);
 
      millisBel = millis() + waktuBel;
      digitalWrite(pinBel, relayAktif);
 
      digitalWrite(pinGroupIndikator[groupScan], HIGH);
      statusTombol = false;
      tombolAktif = false;
    }
  }
  else if (!tombolAktif)
  {
    Serial.println("Sesi mulai");
 
    tombolAktif = true;
  }
 
  if (millisBel < millis())
  {
    digitalWrite(pinBel, !relayAktif);
  }
}