I use max7219 display 7 segment led.( max7219 scan 8digit), but my code display 8 digit for 8 7-segment led common display. And now I want to display to digit 4-7 different digit 0-3, can you help me the problem? void ledxanh1(int n) { for (int t=n;t>=0; t--){ // int tenths; // int secones; t…

I want to question about the traffic lights

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