/*
  7 Segment LED
  
  This example code is in the public domain.
 */
 
// we will use pins 0-6 to be the 7 pins of the display (ignore decimal point)

// 7 segment LED
//    a
//  f   b
//    g
//  e   c
//    d

// 0 is a b c d e f    1111110
// 1 is b c            0110000
// 2 is a b d e g      1101101
// 3 is a b c d g      1111001
// 4 is b c f g        0110011
// 5 is a c d f g      1011011
// 6 is a c d e f g    1011111
// 7 is a b c          1110000
// 8 is a b c d e f g  1111111
// 9 is a b c d f g    1111011

int digits[10] =
 { 
   0b1111110,
   0b0110000,
   0b1101101,
   0b1111001,
   0b0110011,
   0b1011011,
   0b1011111,
   0b1110000,
   0b1111111,
   0b1111011
 };

int bits[7] =
 {
   0b0000001,
   0b0000010,
   0b0000100,
   0b0001000,
   0b0010000,
   0b0100000,
   0b1000000
 };

// the setup routine runs once when you press reset:
void setup() 
 {
    int i;   
    // initialize the digital output pins
    for (i=0; i<7; i++)
     { /* for each segment/pin */
       pinMode(i, OUTPUT);  
     } /* for each segment/pin */
     
 }

// the loop routine runs over and over again forever:
void loop() 
{
  int i;
  
  for (i=0; i<10; i++)
   { /* for */
     displayDigit(i);
     delay(1000);
   } /* for */
}

void displayDigit(int d)
 { /* FUNCTION displayDigit */
   int i;
   
   for (i=0; i<7; i++)
    { /* for */
      if (bitSet(i,d))
         digitalWrite(i, HIGH);
      else
         digitalWrite(i, LOW);
    } /* for */
 } /* FUNCTION displayDigit */
 
int birSet(int b, int d)
 { /* FUNCTION bitSet */
   int tmp;
   
   tmp = bits[b] == (bits[b] & d);
   return tmp; 
 } /* FUNCTION bitSet */