This project is based on a workshop that we organised at Makespace Madrid as part of  "La noche de la electrónica con Jameco".  In a previous instructable we already introduced how to manage a single LED matrix with Arduino. In this project we connect multiple matrices to display text  messages.

It is recommended that you have followed the previous instructable before you do this one.

Step 1: Components

For this project, you need the following components:
- Arduino Uno board
- 4 MAX7219 Red Dot Matrix Module
- 17  jumper wires M/M (male/male)
- 3 jumper wires F/M (female/male)
- Breadboard

Although this instructable uses an Arduino Uno board, you can use other Arduino (compatible) boards

IMPORTANT: The LED matrix is common cathode. This module does not work with common anode matrices.

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