MAX7219-4-digit-display-for-ESP8266
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MAX7219 library for 4 digit display ported to the ESP8266
MAX7219_Dot_Matrix
Arduino library for MAX7219 display using SPI.
For use with 8x8 dot-matrix displays.
For details about the theory, wiring, schematic, etc. see:
http://www.gammon.com.au/forum/?id=11516