gistfile1.ino

void setup(){

   // Tell the digital pins that we'll be using them for output, not input.
   pinMode(5, OUTPUT);
   pinMode(6, OUTPUT);   
   pinMode(7, OUTPUT);
   pinMode(8, OUTPUT);
   pinMode(9, OUTPUT);
   pinMode(10, OUTPUT);
   pinMode(11, OUTPUT);
   pinMode(12, OUTPUT);
   
   // Set all of the pins we'll be using to LOW (i.e. Off).
   digitalWrite(5, LOW);
   digitalWrite(6, LOW);
   digitalWrite(7, LOW);
   digitalWrite(8, LOW);
   digitalWrite(9, LOW);
   digitalWrite(10, LOW);
   digitalWrite(11, LOW);
   digitalWrite(12, LOW);
}

void loop() {
// The letter C:
// Representation of the 1st column of our C character:
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
digitalWrite(10, HIGH);
delay(100); // Keep the first column on for 100 ms.

// Representation of the 2nd column of our C character:
digitalWrite(6, HIGH);
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
digitalWrite(10, HIGH);
digitalWrite(11, HIGH);
delay(100); // Keep the second column on for 100 ms.

// Representation of the 3rd column of our C character:
digitalWrite(5, HIGH);
digitalWrite(6, LOW);  // We need to
digitalWrite(7, LOW);  // turn all of
digitalWrite(8, LOW);  // the other LEDs
digitalWrite(9, LOW);  // not being used
digitalWrite(10, LOW); // at this time
digitalWrite(11, LOW); // to off.
digitalWrite(12, HIGH);
delay(300) // Keep the third column on for 300 ms.

... and the rest of the letters ...
}