teensy 7-segment display

gistfile1.ino

/************************************************************************
 * Teensy 3.0: Random Numbers on BCD 7-Segment Display    Version: 1.00 *
 * Functions : Random Numbers between 00 & 99. TURBO-mode, FREEZE-mode  *
 * MicroCtrlr: MK20DX128 32 bit ARM Cortex-M4 48 MHz                    *
 * Arduino Shield: Alexan Digital Trainer 2 from Alexan Commercial      *
 ************************************************************************
 * Arduino IDE v1.0.5 from http://arduino.cc/en/Main/Software           *
 * Teensyduino v1.14 from http://www.pjrc.com/teensy/td_download.html   *
 * Configuration: Teensy 3.0 on /dev/ttyACM0                            *
 * Operating System: Xubuntu Linux 13.10 Saucy Salamander (32-bit)      *
 * Created: January 27, 2013 (Arduino Mini)      Revised: June 20, 2013 *
 ************************************************************************
 *         MirandaSoft! - Pasig City, Metro Manila, Philippines         *
 *         http://www.element14.com/community/blogs/mirandasoft         *
 ************************************************************************
 *                        The Main Ingredients                          *
 * Teensy 3.0 from http://www.pjrc.com/teensy/                          *
 * CD4511 BCD to 7-Segment Latch/Decoder (element14 Order#: 1106122)    *
 * Common Cathode 7-Seg Hyper-Red Disp (element14 Order#: 2001769)      *
 ************************************************************************/

int inputs1[4] = { 9, 8, 7, 6}; // A,B,C,D inputs Display 1
int inputs2[4] = { 14, 15, 16, 17}; // A,B,C,D inputs Display 2

int tamad = 1000;  // Delay of 1000 miliseconds
int huli, bilang, val;  // Randomly Chosen Numbers
int pigilin = 2;   // Hold pin
int mabilis = 3;  //  Turbo pin

// Binary-code Decimal (BCD) 
// These are 7-Segment Digits from 0 to 9
byte BCD[16][4] ={{0,0,0,0},{1,0,0,0},{0,1,0,0},{1,1,0,0},
{0,0,1,0},{1,0,1,0},{0,1,1,0},{1,1,1,0},{0,0,0,1},{1,0,0,1}};

void setup() {
  randomSeed(analogRead(A9));    //initialize the random number generator
  for(int m = 0; m < 4; m++) {
    pinMode(inputs2[m], OUTPUT); //set outputs for Display 2
    pinMode(inputs1[m], OUTPUT); //set outputs for Display 1
    bilang = random(100);        // Enhances Randomness!!!
    }
    pinMode(mabilis, INPUT);           // Switch: Turbo-mode
    pinMode(pigilin, INPUT);           // Switch: Freeze-mode
}

void ipakita(int pamalas) {
  if((pamalas > 99) || (pamalas < 0)) pamalas = 00;     //  Error Handler
  
  for(int pasig = 0; pasig < 4; pasig++){
    digitalWrite(inputs1[pasig], BCD[pamalas / 10][pasig]);
    digitalWrite(inputs2[pasig], BCD[pamalas % 10][pasig]);
    }
}

void loop() {
  huli = bilang;
  bilang = random(1,99);

  // Simple Error Handler to Prevent Duplicate Numbers
  if(huli==bilang) {
    randomSeed(analogRead(A9));
    bilang = random(1,99);
  }
  val = digitalRead(mabilis);     // TURBO mode
  if(!val) {
    tamad = 5000;                 // Not Switched: 5 Seconds
  }
  else {
    tamad = 100;                  // Switched: 0.1 Seconds
  }
  ipakita(bilang);
  delay(tamad);
  while(digitalRead(pigilin));    // FREEZE mode
}