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並前往https://arduinoplusplus.wordpress.com/2015/09/12/max7219-and-led-matrix-power-requirements/

MAX7219 and LED matrix power requirements - Arduino++

The MAX7219 has a resistor that sets the maximum current supplied to the matrix (RSET in the datasheet). My matrix has VLED ≈ 2V (red LED) and ...

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