How to install dot matrix display on Raspberry Pi Pico W
To purchase: https://ali.ski/-bTNCN
MAX7219 is an integrated serial input/output common cathode display driver,it is connected to a microprocessor and an 8-digit 7-segment LED display.it can also be connected to a bar graph display or 64 independent LEDs.It includes an on-chip B-type BCD encoder, multi-channel scanning loop, segment word driver, and an 8*8 static RAM for storing each data.Only one external register is used to set the segment current of each LED.
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