シナリオ
Circuit diagram for driving a 16x16 bi-color LED matrix with a MAX7219 display driver controlled by an Arduino Nano over SPI.
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01
SPI control pins DIN, CLK, CS connected between Arduino and MAX7219
02
ISET resistor sets LED current
03
Decoupling capacitor stabilizes 5V supply
Use when wiring an Arduino Nano to a MAX7219-based LED matrix display, including power and current-setting components.