8-Digit LED Display MAX7219 Digital Control Tube Module Red Matrix For Arduino
3,22 €
VCC and GND Do not reversed, it would burn the chip. 51 MCU P0 port requires pull-up resistor, if your device does not have a pull-up resistor can be connected to other ports data lines. Wiring instructions (a program, for example, you can pick any IO port definition can be modified in the program).
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