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Max7219 LED matrix

A project log for Clock Message Box

WIFI connected clock.

matt thurstanmatt thurstan 06/18/2020 at 19:480 Comments

I used 5x Max7219 LED matrices for this project. During testing I had issues with LED rows dropping out or LEDs going off and on. It turned out that while daisy-chaining the LED matrices together, power drops after 4 matrices. I solved this by powering the first 3 via the initial cables, then adding a separate power line for the last 2. 

...now I know why they are sold in packs of 4.

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