title: Arduino 8x8 led matrix letters
body: <p>I have an Arduino 8x8 led attached to a shield on the Arduino. Now I want it to display some text. I've discovered how to make the correct byte for each letter. But I have no clue how to light it on my display. The tutorials I see on the internet are not really understandable. I would like to use a function where I can fill in the letter I want to use and how long it should be on the display. Like this: <code>displayLetter(byte letter[], int timeOnDisplay)</code>
  Any advice is nice.</p>
  
  <p>I don't the know model, it was included in my Elektor Arduino kit. It can be seen at link. Currently I have declared all my bytes like this </p>
  
  <pre><code>byte A[] = {     
      B00000000,
      B00111100,
      B01100110,
      B01100110,
      B01111110,
      B01100110,
      B01100110,
      B01100110}; 
  </code></pre>
  
  <p>as well as </p>
  
  <pre><code>void setup() { 
      Serial.begin(9600); 
      for (byte i = 2; i &lt;= 13; i++) 
          pinMode(i, OUTPUT); 
      pinMode(A0, OUTPUT); 
      pinMode(A1, OUTPUT); 
      pinMode(A2, OUTPUT); 
      pinMode(A3, OUTPUT); 
  }
  </code></pre>
  
  <p>Which I got from an online tutorial.</p>
  
  <p>I use an Arduino Uno and my 8x8 led is connected via a shield.</p>
  
  <p>Greetings</p>