int ButtonStatus = LOW;
boolean running = true;
long currentMillis = 0;
long previousMillis = 0;

//PIN ID

int WaterIn = 2;
int CausticIn = 3;
int CausticReturn= 4;
int SanitizerIn = 5;
int SanitizerReturn = 6;
int CO = 7;
int heaterPin = 8;
int WaterDrain = 9;
int CausticDrain = 10;
int SanitizerDrain = 11;
int button = 13;
int KegAir = 12;
int StopButton = 21;
int stoplight = 20;

//CYCLE TIMES

int WaterWashTime = 3000;
int WaterDrainTime = 3000;
int CausticWashTime = 3000;
int CausticDrainTime = 3000;
int SanitizerWashTime = 3000;
int SanitizerDrainTime = 3000;
int COTime = 3000;
int CycleDelay = 1000;
int COSanitizer = 2000;
int SanitizerReturnTime = 2000;
int CausticReturnTime = 2000;
int airtime = 500;
int stoplighttime = 3000;









void setup() {
pinMode(WaterIn,OUTPUT);
pinMode(CausticIn, OUTPUT);
pinMode(CausticReturn, OUTPUT);
pinMode(SanitizerIn, OUTPUT);
pinMode(SanitizerReturn, OUTPUT);
pinMode(CO, OUTPUT);
pinMode(heaterPin, OUTPUT);
pinMode(WaterDrain, OUTPUT);
pinMode(CausticDrain, OUTPUT);
pinMode(SanitizerDrain, OUTPUT);
pinMode(12, OUTPUT);
pinMode(button, INPUT_PULLUP);
pinMode(stoplight, OUTPUT);
pinMode(StopButton, INPUT_PULLUP);
}


void cycle1() {(digitalWrite(WaterIn, HIGH));          //water in valve opens
        (digitalWrite(WaterDrain, HIGH));       //water drain valve opens
         (delay(WaterWashTime));                //cycle 1 time 
         (digitalWrite(WaterIn, LOW));          //water in valve closes
         (digitalWrite(KegAir, HIGH));         //air pushes water out
         (delay (airtime));                    //time air to keg
         (digitalWrite(KegAir, LOW));            //air to keg off
         (delay(WaterDrainTime));               //water drain time
         (digitalWrite(WaterDrain, LOW));       //water drain closes
         
}
void cycle2(){
(digitalWrite(CausticIn, HIGH));       //Caustic in opens, caustic supply air opens, caustic reciever tank vents
         (digitalWrite(CausticDrain, HIGH));    //Caustic Drain Valve opens
         (delay(CausticWashTime));              //Cycle 2 time
         (digitalWrite(CausticIn, LOW));        //Caustic in closes, caustic supply air closes, caustic reciever vent closes
         (digitalWrite(KegAir, HIGH));         //air pushes water out
         (delay (airtime));                    //time air to keg
         (digitalWrite(KegAir, LOW));            //air to keg off
         (delay(CausticDrainTime));             //Caustic Drain Time
         (digitalWrite(CausticDrain, LOW));     //Caustic Drain Closes
}
void cycle3(){
  (digitalWrite(SanitizerIn, HIGH));      //Sanitizer in valve opens, Sanitizer supply air opens, Sanitizer reciever vents
         (digitalWrite(SanitizerDrain, HIGH));  //Sanitizer Drain Opens
         (delay(SanitizerWashTime));            //Cycle 3 time
         (digitalWrite(SanitizerIn, LOW));      //Sanitizer in valve closes, Sanitizer supply air closes, Sanitizer reciever vent closes
         (delay(SanitizerDrainTime));           //Sanitizer Drains
         (digitalWrite(CO, HIGH));              //CO2 pushes out Sanitizer
         (delay(COSanitizer));                  //CO2 and Sanitizer Drain time
         (digitalWrite(SanitizerDrain, LOW));   //Sanitizer Drain Closes
         (delay(COTime));                       //CO2 Pressurizes Keg
         (digitalWrite(CO, LOW));               //CO2 off
}

void sanitizerreturn(){
(digitalWrite(SanitizerReturn, HIGH));
CheckStopButton(SanitizerReturnTime);
(digitalWrite(SanitizerReturn, LOW));
}

void causticreturn(){
(digitalWrite(CausticReturn, HIGH));   //Caustic returns to supply tank
CheckStopButton(CausticReturnTime);
(digitalWrite(CausticReturn, LOW));
}                                      //Caustic return off


 void CheckStopButton()  {
   
} 





  


 void loop(){
   int currentstatus = digitalRead(button);
   
      if (currentstatus == LOW && ButtonStatus == LOW)
           {(digitalWrite(heaterPin, HIGH));}
      else {
        (digitalWrite(heaterPin, LOW));       //heater turns off
        (delay(CycleDelay));                    //cycle switch delay
        cycle1();
        (delay(CycleDelay));                   //cycle switch delay
        cycle2();
        (delay(CycleDelay)); 
        cycle1();
        (delay(CycleDelay));  
        cycle3();   
        causticreturn();
        sanitizerreturn();
     }  
         
  void CheckStopButton(int delay){
    boolean ButtonDown = false;
    boolean ButtonBackUp = false;

    boolean input;

    currentMillis = millis();       //number of MS since program started running
    previousMillis = currentMillis;  //records startup MS
    while (currentMillis - previousMillis < delay)
    {
      input = digitalRead(StopButton);
      if(input == HIGH){
        buttonDown = true;
      }
      else if(buttonDown == true & input = LOW){
        buttonBackUp = true;
      }
      
      currentMillis = millis();
    }

    if(buttonDown == true){
      running = false;
    }
    
    while (running == false & buttonBackUp == false){
       input = digitalRead(StopButton);
       if(input == LOW){
         buttonBackUp = true;
       }
    }

    int lastInput = LOW;
    while (running == false){
      input = digitalRead(StopButton);
      if(input == HIGH){
        lastInput = HIGH;
      }
      else if(input == LOW & lastInput == HIGH){
        running = true;
      }
    }
  }    
        
         
 }