MAX7219 - maximum brightness and minus sign #159
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…-C3" and NEGATIVE NUMBERS
BugerDread
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Maximum brightness for MAX7219 is 15, it starts over from lowest brightness if >15, also see https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf page 9 - there are only 16 levels of brightness for both MAx7219 / 7221 controlled by 4 bits D0 - D3.
added minus sign into font_7seg, now we can display negative numbers and texts like "ESP32-C3"