MAX7219 5V CWG 8-Digit Digital Tube Display Control Module Red
4,76 €
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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