Similarly, scrolling speed can be increased or decreased by sending / respectively. Every time the Arduino receives '/', it understands it is a command. Display intensity can be incremented or decremented by sending /+ or /- respectively. The message is displayed as scrolling from right to left. Example: Suppose if you want to display a message "Hello! How are you doing?" You should send it like this: (Hello! How are you doing?) When the Arduino receives the first character as '(', it understands that the upcoming characters are display data until ')' is received. Any character stream must be sent enclosed inside parenthesis. * Here are the commands Arduino recognizes. In the end, I put the whole device in a box, which I made from a PVC material that I put on it with a black wallpaper. It can control the speed of the scrolling, brightness of leds, pause, erase text, and several predefined text buttons. An android application does not exist anymore on Google Play store, so you can download it from : At the moment, I only had 7 modules, so I made a small modification of the code. Unlike there, I used ready-made 8x8 matrix modules with MAX7219 chip that can be purchase very cheap on Ebay or Alexpress. The device contains an Arduino nano, Bluetooth module for receiving data from the smartphone and 8x8 LED matrices driven by MAX7219. After several attempts to make a scrolling text on the 8x8 matrix, I found the most complete manual on the Embedded Lab page.
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