Qfyilyi

I am hoping that someone can guide me on this, I am at a total loss and have no idea what i need to change. I put this code together by bits and pieces from other examples I have seen. I am trying to get get the display to display the word 'End' once the countdown time has completed its cycle, I just dont understand the code to mke any further changes to the display part.

This is basically what the code does. I use a rotary and put in a time, I press the rotary switch and the timer starts counting down while displaying the value in the 4 digit 7-segment tube display. At the end of the countdown the tube diplay goes blank, instead of blank I want to display the word "End" how can I make this possible?

I know the catch is in the function setDigit() but I dont know anything about working with 7-segment display, this is my first time.

const int PinCLK = 3;  // Rotary CLK signal

const int PinDT = 2;   // Rotary DT signal

const int PinSW = 0;   // Rotary switch

int lastCount = 0;

volatile int virtualPosition = 0;

int timeCount = 0;  // count in tenths of seconds

int sequence_Num = 0;



char disp[4];

const int PinSCLK = 10;

const int PinRCLK = 11;

const int PinDIO = 12;

int Display[4];

unsigned long prev = 0;

unsigned long waitMS = 0;



void isr()

{

  static unsigned long lastInterruptTime = 0;

  unsigned long interruptTime = millis();



  // If interrupts come faster than 5

  if(interruptTime - lastInterruptTime > 5)

  {

    if(digitalRead(PinDT) == LOW)

    {

      virtualPosition = virtualPosition+10;

    }

    else

    {

      virtualPosition = virtualPosition-10;

    }



    virtualPosition = min(1000, max(0, virtualPosition));

  }



  lastInterruptTime = interruptTime;  // Keep track of when we were here last (no more than every 5ms)

}



void displayCount()

{

  showDisplay();

  for(int i = 0; i < 4; i++)

  {

    setDigit(i, Display[i]);

  }

}



void setDigit(int dig, int character)

{

  //  0   1  2  3 4 5 6 7    for 8 digit array

  int digits = {128, 64, 32, 16, 8, 4, 2, 1};



  // 21 items character set (0-9)0-9, (10-19)0.-9., (72)- (73) space

  int characters = {3, 159, 37, 13, 153, 73, 65, 31, 1, 9, 2, 158, 36, 12, 152, 72, 64, 30, 0, 8, 255};



  digitalWrite(PinRCLK, LOW);

  shiftOut(PinDIO, PinSCLK, LSBFIRST, characters[character]);

  shiftOut(PinDIO, PinSCLK, LSBFIRST, digits[dig]);

  digitalWrite(PinRCLK, HIGH);

}



void showDisplay()

{

  for(int i = 0; i < 4; i++)

  {

    int val = disp[i];

    if ((val >= 32) && (val <= 47))

    {

      switch(val)

      {

        case 45 : val = 20;

          break;

          default : val = 20;

          break;

      }

    }

    else if ((val >= 48) && (val <= 57))

    {

      val -= 48;

    }

    Display[i] = val;

  }

}



void wait(unsigned long milsec)

{

  prev = millis();

  waitMS = milsec;

}



void showText(char a, char b , char c, char d)

{

  disp[0] = d;

  disp[1] = c;

  disp[2] = b;

  disp[3] = a;

}



void setTimer(bool inc)

{

    displayCount();

    if(millis() > (prev + waitMS))

    {

      if(inc)

      {

        if(timeCount = virtualPosition)

        { // NOTE: This incrementer continues to count although the display 'int period' has occured

          showText(' ', virtualPosition / 1000 % 10, virtualPosition / 100 % 10 + 10, virtualPosition / 10 % 10);

          if(timeCount < virtualPosition)

          {

            timeCount++;

          }

          wait(9); // Delay to compensates for lag to count in increments of 9 milliseconds

        }

      }

      else

      {

        if(timeCount <= virtualPosition) 

        { 

          showText(' ', (timeCount / 1000) % 10, (timeCount / 100) % 10 + 10, (timeCount / 10) % 10);

          timeCount--;

        }

        wait(9);

        if(timeCount == 0) 

        {

          timeCount = virtualPosition;

          sequence_Num = 1;

          delay(2000);

        }

      }

    }

}



void setup() 

{

  Serial.begin(9600);             // Just whilst we debug, view output on serial monitor

  pinMode(PinCLK, INPUT);        // Rotary pulses are INPUTs

  pinMode(PinDT, INPUT);         // Rotary pulses are INPUTs

  pinMode(PinSW, INPUT_PULLUP);  // use the in-built PULLUP so we don't need a resistor



  attachInterrupt(digitalPinToInterrupt(PinCLK), isr, LOW);     // Attach the routine to service the interrupts

  pinMode(PinRCLK, OUTPUT);  // latch

  pinMode(PinDIO, OUTPUT);

  pinMode(PinSCLK, OUTPUT);



  lastCount = virtualPosition;

  sequence_Num = 1;

}



void loop() 

{

  // Is someone pressing the rotary switch?

  if((!digitalRead(PinSW)))

  {

    while(!digitalRead(PinSW))

    delay(9);

    sequence_Num = 2;

  }



  switch(sequence_Num)

  {

    case 1:  

      setTimer(true);

      break;

    case 2:

      setTimer(false);

      break;

  }

}

Appreciate any help and explaining so I can understand for future use.

Thanks