128x64 LED Matrix From 8x32 MAX7219 Modules

I'm gonna need LEDs ... Lots of LEDs ...

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I've always wanted to make a large LED matrix to hang on my wall and display random info so here's my first step towards that. Special Thanks to JLCPCB for sponsoring this project. JLCPCB Prototype for $2 (Any Color):

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davedarko wrote 07/17/2020 at 18:25 point

nice! how is this controlled? always wanted to have an LED matrix to replace the OLED screen and play some arduboy games on it :D

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sjm4306 wrote 07/27/2020 at 04:10 point

Thanks! It's basically two MAX7219 spi chains, each controlling 128x32 leds (well currently waiting on more led matrices to arrive). Each submodule is 8x32 with 4 max chips and everything is basically a very long serial chain. The combined fanout/clock+chip select capacitance are limiting factors in terms of update speed using the drive architecture I've opted but it'd be easy enough to break down the display into smaller chains and use more spi busses to send data in parallel to the subsections if a higher refresh speed is needed.

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