The Arduino Uno R4 was recently released in two versions, one of which (the Uno R4 WiFi) includes a matrix of 8×12 red LEDs. Here is a handy utility that will accept a text input and output the code necessary for use with the ArduinoLEDMatrix library. Just create eight lines of text, with X where you want an LED lit up and space for those to be off. The utility will create output with the three 4-byte lines of hex (plus the delay line) for each frame of the 96 LEDs which when used with the ArduinoLEDMatrix (Arduino_LED_Matrix.h) library on an Uno R4 WiFi, it will scroll the output from right to left. If there’s interest, I can add additional features.

https://www.strangeworld.com/devel/webutils/unoledmatrix.php