// Code from https://forum.arduino.cc/t/do-loop-running-over-rtc-comparison/1362838?u=davex
// Wokwi setup 
// from https://wokwi.com/projects/305979285237137984
// from https://docs.wokwi.com/parts/wokwi-ds1307

#include <Wire.h>
#include <RTClib.h>


RTC_DS1307 rtc;

//Inputs & Outputs

int Dirty=5;   //Pressure Transducer N/O
int Filter=9;  //Filter Motor Advance Output

//Time Vars
DateTime Now;                 //Current time read in
DateTime FilterAdv;           //Time to stop advancing filter (calculated)

//Filter advance time in seconds
int FilterAdd = 30;

//showDate necessary only for output to Serial for checking code
// use: ex. [showDate("dt", dt);] to see calculated time in unix
void showDate(const char* txt, const DateTime& dt) {
    Serial.print(txt);
    Serial.print(' ');
    Serial.print(dt.year(), DEC);
    Serial.print('/');
    Serial.print(dt.month(), DEC);
    Serial.print('/');
    Serial.print(dt.day(), DEC);
    Serial.print(' ');
    Serial.print(dt.hour(), DEC);
    Serial.print(':');
    Serial.print(dt.minute(), DEC);
    Serial.print(':');
    Serial.print(dt.second(), DEC);

    Serial.print(" = ");
    Serial.print(dt.unixtime());
    Serial.print("s / ");
    Serial.print(dt.unixtime() / 86400L);
    Serial.print("d since 1970");

    Serial.println();
}

void setup() 
{
  pinMode(Dirty, INPUT_PULLUP);  
  pinMode(Filter, OUTPUT);
    digitalWrite(Filter, LOW);


  Serial.begin(9600);

  //Initialize DS3231 clock
  rtc.begin();
}

void loop() 
{
  if (digitalRead(Dirty) == LOW)
  {
    Serial.println("Advance Paper");
    AdvancePaper();
  }     
}

void AdvancePaper()
{
  Now = rtc.now();
  FilterAdv = (Now.unixtime() + FilterAdd);
  showDate("Now", Now.unixtime());
  showDate("FilterAdv", FilterAdv.unixtime());

  do
  {
    //Serial.println("Looping");
    digitalWrite(Filter, HIGH);
    Now = rtc.now();
  } while (Now.unixtime() < FilterAdv.unixtime());

  
  Serial.println("Leave While Loop");
  digitalWrite(Filter, LOW);

  showDate("Now", Now.unixtime());
  
}