Our project is infact an Arduino with Serially Interfaced MAX7219 Operates an 8X8 LED Matrix to display a heart pattern. The MAX7219 IC is a serial input/output common-cathode display driver that ...

In a fit of awesome salvaging, [Piet] picked up a huge, 16 character, 2 line display. It’s monstrous, designed for outdoor installations; road signs, train stations, and the like.

He ended up designing an 8 by 16 grid of LED’s that was turned into a game of Tetris. He arranged all 128 LED’s into the grid on a piece of perfboard. All of the anodes were bent over and ...

That’s where this lovely 16×8 LED matrix backpack PCB comes in. It contains a HT16K33 I2C LED matrix driver that does all the multiplexing work for you, and is controlled over the two I2C pins.