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ANY PROBLEMS WITH DISPLAYS, THIS IS CHARACTERISED BY NO DISPLAY AT ALL, NO FLASHING OR ANY DISPLAY, TRY ANOTHER MAX7219CNG IC WITH DIFFERENT CODE, SAY FROM MAX7219CNG 2219+ TO A CODE OF MAX7219CNG HLF 23A8.
THE DOT MATRIX DISPLAYS ARE COMMON CATHODE USED HERE.
LEDLABS CONNECTION TO THE DOT MATRIX DISPLAYS
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