The heavy lifting is handled by an Arduino Mega ... some transistors the matrix circuit was working as expected with a simulated input, so the next step was the main board with the processor.

There’s his DIY LED display controlled by an Arduino UNO. To have some text ... To make both the LED matrix circuit board and the control board, [Joekutz] carved out isolation paths in copper ...

The Nova is a tiny RP2040 board with a 7x10 LED matrix for creative projects. It works with MicroPython and Arduino IDE, offering the potential for various applications. Interested crowdfunders ...