I want to make a count down time that auto repeats

Projects Programming
1

I'm using a Mega 2560
I'm using 2 digits, need it to count down in seconds from 30 sec

I've modified a sketch I found in the Project Hub, to get it to count down in seconds but it doesn't Auto-repeat

Any ideas on how I can achieve this?

Thanks Shane

//7 segement pin number - 7 segement light - arduino pin number

//pin 11 - A = 12
//pin 7 - B = 10
//pin 4 - C = 8
//pin 2 - D = 7
//pin 1 - E = 6
//pin 10 - F = 11
//pin 5 - G = 9

//pin 3 is decimal

/*
12 11  10  9 8 7
|   |   |  | | | 
    A
   ---
F |   | B
  | G |
   ---
E |   | C
  |   |
   ---  . dec
    D
| | | | | |
1 2 3 4 5 6
*/

//pin 12 - first digit = 1
//pin 9 - second digit = 2 
//pin 8 - third digit = 3
//pin 6 fourth digit = 4

const int a = 1;
const int b = 2;
const int c = 3;
const int d = 4;
const int e = 5;
const int f = 6;
const int g = 7;
int p = 0;


int startStopReset = 13; 

const int d1 =8;
const int d2 =9;

long n = 30000; //start time -> CAN CHANGE TO WHATEVER TIME YOU WANT
int x = 10; 
int del = 55; //delay value
 
void setup()
{
  pinMode(d1, OUTPUT);
  pinMode(d2, OUTPUT);
 
  
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(p, OUTPUT);
   
  
  
}
 
void loop()
{
  digitalWrite (p, HIGH);

  clearLEDs();
  pickDigit(1);
  pickNumber((n/x/1000)%10);
  delayMicroseconds(del);
  
  clearLEDs();
  pickDigit(2);
  pickNumber((n/x/100)%10);
  delayMicroseconds(del);
 
  clearLEDs();
  pickDigit(3);
  dispDec(3);
  pickNumber((n/x/10)%10);
  delayMicroseconds(del);
 
  clearLEDs();
  pickDigit(4);
  pickNumber(n/x%10);
  delayMicroseconds(del);
 
  n--; //'n++' for stopwatch
 
  if (digitalRead(13) == LOW)
  {
    n = 20000; //re-start time -> CHANGE TO WHATEVER TIME YOU ORIGONALLY SET (start time)
  }
}
 
void pickDigit(int x) //changes digit
{
  digitalWrite(d1, HIGH);
  digitalWrite(d2, HIGH);
  
  
 
  switch(x)
  {
  case 1: 
    digitalWrite(d1, LOW); 
    break;
  case 2: 
    digitalWrite(d2, LOW); 
    break;
  
  }
}
 
void pickNumber(int x) //changes value of number
{
  switch(x)
  {
  default: 
    zero(); 
    break;
  case 1: 
    one(); 
    break;
  case 2: 
    two(); 
    break;
  case 3: 
    three(); 
    break;
  case 4: 
    four(); 
    break;
  case 5: 
    five(); 
    break;
  case 6: 
    six(); 
    break;
  case 7: 
    seven(); 
    break;
  case 8: 
    eight(); 
    break;
  case 9: 
    nine(); 
    break;
  }
}
 
void dispDec(int x)
{
  digitalWrite(p, LOW);
}
 
void clearLEDs()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p, LOW);
}
 
void zero()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
}
 
void one()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}
 
void two()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
}
 
void three()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
}
 
void four()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void five()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void six()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void seven()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}
 
void eight()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
 
void nine()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}
2

@cycl1n Why do users choose to ignore the advice on posting code ?

The easier you make it to read and copy your code the more likely it is that you will get help

Please follow the advice given in the link below when posting code , use code tags and post the code here

3

use </> (of course everyone knows what that is, right ??)

5

@gcjr clearly not

6

UKHeliBob not sure about others, but I guess we find this forum and not think about going and looking for advice on posts, we are too excited about getting help, details get forgotten
Thanks for your advice :upside_down_face:

7

please edit you're original post (the pencil icon), click the </> icon and paste your code in the highlighted area

8

It was cool that I got advice on how to post, Now hopefully, someone will come along that can help me with my project?

9

can you explain "how" the original code works, "what" it does, what you want it to do and how you attempted to modify it to do that?

10

If I knew how the code worked I probably wouldn't be here asking for help

What it does, it counts down in seconds (which change it to this was just a case of change x from 100 to10)
What I want it to do, is auto-repeat
I haven't yet modified it to auto-repeat as I don't know how, that is why I am here asking for help

11

good luck