Arduino et matrices de leds : un afficheur piloté depuis Internet

Je me décide enfin à documenter ce projet initié en 2011 alors que j’étais en expatriation aux USA. L’idée était de faire une « œuvre » connectée sur laquelle mes amis pourraient afficher le message de leur choix. Au final, le résultat n’a rien d’une « œuvre », mais caché par exemple dans un sapin pour faire un arbre de noël connecté, le truc fonctionne…

Le matériel:

Une carte Arduino-Compatible Mega 1280: http://arduino.cc/en/Main/ArduinoBoardMega

• ATmega1280 Microcontroller
• Bootloader installed, ready to upload sketches from Arduino software
• Flash Memory 128 KB (32KB pour la uno standard)
• EEPROM 4 KB

Une carte Arduino Uno suffirait pour ce projet (taille binaire du croquis : 22,9KB)

Une carte Ethernet W5100 Ethernet Shield V.6

(Supports micro SD card, PoE – Power-over-Ethernet Ready)

8 modules comprenant une matrice de 64 leds et un circuit Maxim7219

Pour la l’afficheur, après avoir créé un PCB pour assembler une matrice de led 8×8 et un circuit Maxim7219 (afin de piloter ces matrices avec un minimum de I/O) j ai découvert sur eBay des modules en kit à monter pour beaucoup moins cher : http://www.ebay.com/itm/MAX7219-Dot-Matrix-Module-MCU-Control-Display-Module-DIY-Kit-for-Arduino-/221443810162

2 LM 7805 (régulateur de tension 5V)

Les matrices de LED sont consommatrices en courant et j’ai choisi de les alimenter en utilisant l’alimentation 9V de l’Arduino et en la régulant en 5V (plutôt que d utiliser la sortie 5V de l’Arduino qui ne peut délivrer tout le courant nécessaire)

Le logiciel

(Derniere version disponible sur le Github des Fabriqueurs: https://github.com/les-fabriqueurs/Web-Scroll-Matrix )

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Et le boitier imprimé en 3D

Un peu d’indulgence sur le design, ce fut mon TP d’apprentissage de la modélisation 3D avec FreeCAD il y a presque 2 ans maintenant

Bien planqué dans un Sapin de Noël, ca passe…

Evolutions du projet: forum des fabriqueurs