Arduino DOT Matrix

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Schon vor etwas längerer Zeit habe ich mir ein Arduino Basis Bausatz  geholt, da ich vor hatte ein wenig damit zu experimentieren.  Bedauerlicherweise ist dieses Experiment mangels Zeit viel zu schnell in einer Ecke verstaubt und liegengeblieben. Motivation den Bausatz wieder hervorzuholen bekam ich tatsächlich an der Easterhegg, da dort einfach zu viele Leute mit diesen Dingern experimentierten und ich dadurch automatisch mit einer Portion Neugier und unterbewussten Inspirationen konfrontiert wurde. Dort habe ich mir dann auch eine 8×32 LED Matrix von Sure Electronis gekauft mit der Hoffnung dieses Ding auch irgendwann zum Laufen zu kriegen. Knapp 3 Wochen ist es nun her seit ich Dank einigen Recherchen im Netz eine funktionierende LED Matrix mit Schriftzug habe 😉

Das Ergebnis und wie Ihr ebenfalls eine LED Matrix mit fahrendem Schriftzug in Betrieb nehmen könnt möchte ich hier mit euch teilen 😀

Was wird benötigt?

Java basierende Arduiono Programierumgebung

Arduino UNO oder Duemilanove Board. Siehe Boardindex

8×32 LED Matrix Shield von Sure Electronis  (Achtung yellow!)

1 Flachbandkabel (Meist im Lieferumfang mit Sure LED Matrix Shield enthalten)

6 Jumper Kabel

Die erste „Challenge“ bestand nun darin herauszufinden, wie ich das Arduino Board mit der LED Matrix verbinden kann.Auf den ersten Blick gar nicht so einfach. Auf youtube habe ich zwar zig Filmchen mit funkelnden LED Schriftzügen gefunden, aber leider ohne Hinweis zum Code und Verbindungsschema. Danach stosse ich auf das Manual, wo ich zumindest eine Beschreibung der Pin Belegung finde. Da „Wer sucht, der findet!“ ein Leitsatz ist, den ich mir stets zu Herzen nehme, gebe ich nicht auf und stosse durch weitere Recherchen auf das ersehnte Verbindungsschema und den Code.  Es kann losgehen 😀

CS2, CS3 und CS4 wird nur benötigt wenn mehrere(max. 4) Sure LED Matrix Shields in Serie zusammengehängt werden.

Pinbelegung Sure LED Matrix

Nun schliessen wir das Flachbandkabel an den Connector der Sure LED Matrix an. Die andere Seite des Flachbandkabels greifen wir mit den Jumper Kabeln ab, um eine Verbindung gem. Pinbelegung oben mit dem Arduino Board herzustellen.

Die Steckplätze auf dem Arduino Board sind nummeriert, so dass man eigentlich nichts falsch machen kann!

Fertig verkabelt sieht das ganze dann so aus:

Linux Shell öffnen und Code mit folgendem Befehl downloaden (Pfad für Arduino Library und Beispielverzeichnis weicht ggf. ab):

git clone git://github.com/devdsp/HT1632-AVR.git
cp -a HT1632-AVR/libraries/* ~/arduino/libraries/
cp -a HT1632-AVR/simple8x32/ HT1632-AVR/marquee8x32/ ~/arduino/examples

Achtung das git Protokol benötigt TCP Port 9418 (muss ggf. auf der Firewall geöffnet werden). Ansonsten antelle von git:// einfach ein http:// machen! 😉

Wenn bis hierhin alles funktioniert hat, solltet ihr in der Arduino Programmierumgebung unter den Beispielen ein Programm namens marquee8x32 finden.

Unter char* string = „“ könnt Ihr nun ein beliebiger Text eintragen, der anschliessend als Laufschrift angezeigt wird!

Wird das Program nun Kompiliert und auf das Board geladen stellen wir fest, dass zwar ein Text angezeigt wird, dieser aber viel zu schnell ist. Daher bauen wir in der loop Funktion eine Verzögerung mit delay(60); ein:

Die fertige LED Matrix steht nun als Deko in meinem Bücherregal 🙂

vimeo Direkt

Have Fun!