Persistence of Vision and Temperature sensor Arduino code

{//Reading realtime values of a sensor using persistence of vision typography using the Arduino

// array for displaying numbers or letters

int _[] = {0,0,0,0,0, 0,0,0,0,0, 0,0,0,0,0}; int num1[] = {0,1,0,0,1, 1,1,1,1,1, 0,0,0,0,1}; int num2[] = {1,0,1,1,1, 1,0,1,0,1, 1,1,1,0,1}; int num3[] = {0,1,0,1,0, 1,0,1,0,1, 1,1,1,1,1}; int num4[] = {1,1,1,0,0, 0,0,1,0,0, 1,1,1,1,1}; int num5[] = {1,1,1,0,1, 1,0,1,0,1, 1,0,1,1,1}; int num6[] = {1,1,1,1,1, 1,0,1,0,1, 1,0,1,1,1}; int num7[] = {1,0,0,0,0, 1,0,0,0,0, 1,1,1,1,1}; int num8[] = {1,1,1,1,1, 1,0,1,0,1, 1,1,1,1,1}; int num9[] = {1,1,1,0,1, 1,0,1,0,1, 1,1,1,1,1}; int num0[] = {1,1,1,1,1, 1,0,0,0,1, 1,1,1,1,1}; int dot[] = {0,0,0,0,0, 1,1,0,0,0, 1,1,0,0,0}; int C[] = {1,1,1,1,1, 1,0,0,0,1, 1,0,0,0,1}; int minus[] = {0,0,1,0,0, 0,0,1,0,0, 0,0,1,0,0}; int letterSpace; int dotTime;

int temp;

int tempPin = 0;

void setup() {

 Serial.begin(9600);

 // setting the ports of the leds to OUTPUT
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(5, OUTPUT);
 pinMode(6, OUTPUT);

 // defining the space between the letters (ms)
 letterSpace = 6;
 // defining the time dots appear (ms)
 dotTime = 3;

}

void printLetter(int letter[]) {

 int y;

 // printing the first y row of the letter
 for (y=0; y<5; y++)
 {
   digitalWrite(y+2, letter[y]);
 }
 delay(dotTime);

 // printing the second y row of the letter
 for (y=0; y<5; y++)
 {
   digitalWrite(y+2, letter[y+5]);
 }
 delay(dotTime);

 // printing the third y row of the letter
 for (y=0; y<5; y++)
 {
   digitalWrite(y+2, letter[y+10]);
 }
 delay(dotTime);

 // printing the sspace between the letters
 for (y=0; y<5; y++)
 {
   digitalWrite(y+2, 0);
 }
 delay(letterSpace);

}

void loop() {

  int ara[2];  //Array to store separate digits of the temperature value.
  int count=0;
  int n;
 
 //To calculate values from the LM35
 temp = analogRead(tempPin);
 temp = temp * 0.48828125;
 
 

 //Serial.print(temp);
 
 if (temp == 0)
   printLetter(num0); 
 

 n=temp; //make a copy of the temperature value in another variable.
     
 // To calculate the number of digits in the temperature sensor value

 if (temp > 0)
   {
      while(n!=0)
       {
         n=n/10;
         ++count;
       }
   }
   
    
 //to store the digits of the temperature value in an array  
 for(int i=0;i<=count;i++)
 {
         ara[i]=temp%10;
          temp=temp/10;
          
 }
 
 
 //loop to output the digits stored in the array  
  for(int i=count;i>=0;i--)
  {
    if (ara[i] == 1)
      printLetter(num1); 
    if (ara[i] == 2)
     printLetter(num2);
    if (ara[i] == 3)
     printLetter(num3); 
    if (ara[i] == 4)
     printLetter(num4);
   if (ara[i] == 5)
     printLetter(num5); 
    if (ara[i] == 6)
     printLetter(num6);
   if (ara[i] == 7)
     printLetter(num7); 
    if (ara[i] == 8)
     printLetter(num8);
     if (ara[i] == 9)
     printLetter(num9); 
    if (ara[i] == 0)
     printLetter(num0);  
  } 

 delay(5);
 printLetter(dot); 
 printLetter(C); 

}

}