7 segment LED

Forum 2005-2010 (read only) General Frequently-Asked Questions
3

You could have a function for each number:

#define D 4
#define C 3 
#define B 2
#define A 5

void setup()
{
  pinMode(D, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(A, OUTPUT);
}
void loop()
{
  zero();
  delay(5000);
  one();
  delay(5000);
}

void zero() {
  digitalWrite(D,LOW); // number 0
  digitalWrite(C,LOW);
  digitalWrite(B,LOW);
  digitalWrite(A,LOW);
}

void one() {
  digitalWrite(D,LOW); // number 1
  digitalWrite(C,LOW);
  digitalWrite(B,LOW);
  digitalWrite(A,HIGH);
}

etc.

Each time you want a number you call its function.