I figured this gave a good balance between speed and not driving myself crazy with wiring. I decided that driving all sixty four MAX7219's in one massive SPI chain was probably a bad idea so they have been configured in eight rows of eight controllers each. I did not want to have one massive board to contain everything so I broke the display board into sixteen smaller boards.Įach board will contain a four MAX7219's driving two four character 7 segment displays for a total of 32 characters per board. I decided on a nice round 512 seven segment displays. After seeing things like the DigitGrid and the Pligboot Matrix I decided that I was going to build a 7 segment LED matrix to add to my collection of LED clocks and displays.įirst off was deciding how big I wanted to go.
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